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In order to better evaluate the T-shaped steel reinforced concrete(SRC) shear walls with the widespread application of steel reinforced concrete members deformation behavior, ABAQUS was used to study the failure morphology and deformation behavior of 324 T-shaped SRC shear wall designed according to specification. Based on to the collected test data, the failure mode of the members is analyzed, and the failure mode division criteria of T-shaped SRC shear wall is proposed. Based on the strain limit value of each material of the member, the component performance is judged, and the influence of axial compression ratio, shear span ratio, flexure shear ratio, steel ratio of the concealed column of the web, longitudinal reinforcement ratio of the concealed column and the characteristic value of the stirrup concealed column on the component deformation performance is considered. Through linear regression analysis of deformation limits and parameters in different performance states, the calculation formula of displacement angle limits in different performance states under different failure types is obtained. The failure probability of each performance state deformation limit is corrected according to ASCE 41, and the value table of each performance state deformation limit with 15%, 20% and 35% failure probability guarantee is obtained. The research shows that the shear span ratio and axial compression ratio have greate impact on component displacement angle limit of each performance state, while the steel ratio of the concealed column web, the longitudinal reinforcement ratio and the characteristic value of the stirrup have relatively small impact on the displacement angle limit of the member, but can improve its ductility. The limit value of displacement angle corrected according to ASCE 41 is reasonable and has certain safety reserves. It provides reference for performance-based seismic design and performance evaluation of T-shaped SRC shear wall.

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为更好地评估T形截面型钢混凝土(steel reinforced concrete,SRC)剪力墙变形性能,采用ABAQUS有限元软件对按照规范设计的324个T形截面SRC剪力墙构件的破坏形态和变形性能进行研究,根据收集的试验数据分析构件的破坏形态,提出T形截面SRC剪力墙的破坏形态划分准则;以构件的各材料应变极限值为准则来判别构件的性能状态,考虑轴压比、剪跨比、弯剪比、腹板暗柱配钢率、暗柱纵筋配筋率及箍筋暗柱特征值对构件变形性能的影响。对不同性能状态变形限值和参数进行线性回归分析,得到不同破坏类型下各性能状态位移角限值计算式;按规范ASCE 41修正各性能状态变形限值的失效概率,得到具有15%、20%、35%失效概率保证的各性能状态变形限值取值表。研究表明:剪跨比、轴压比对构件各性能状态位移角限值影响较大,暗柱腹板配钢率、纵筋配筋率及箍筋特征值对构件位移角限值影响相对较小,但能提高其延性。按规范ASCE 41修正后的位移角限值取值较为合理且有一定的安全储备。为T形截面SRC剪力墙基于性能的抗震设计与性能评估提供参考。

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林有超(1982—),男,高级工程师,硕士,主要从事结构工程的设计和研究。E-mail:
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彭修宁(1973—),男,教授,博士,主要从事钢结构的抗震及脆断性能研究。E-mail:

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彭修宁(1973—),男,教授,博士,主要从事钢结构的抗震及脆断性能研究。E-mail:

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Studies on in-plane seismic behavior double-steel-concrete composite shear walls[D]. Beijing: Tsinghua University,2018. 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Experimental study on seismic performance of low-rise steel reinforced concrete shear wall with built-in vertical steel[D]. Chongqing: Chongqing University, 2015. 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The research of vertical stiffness distribution pattern of bulit-in steel of concrete shear wall[D]. Suzhou: Suzhou University of Science and Technology, 2016. (in Chinese), articleTitle=The research of vertical stiffness distribution pattern of bulit-in steel of concrete shear wall, refAbstract=null), Reference(id=1245390167742201861, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, doi=null, pmid=null, pmcid=null, year=2004, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[9], rfOrder=14, authorNames=null, journalName=null, refType=null, unstructuredReference=CEN European Standard EN 1998-1: 2004. Eurocode 8: Design of structures for earthquake resistance. Part 1: Ceneral rules, seismic actions and rules for buildings[S]. 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The experimental study on seismic performance of T-shaped steel reinforced concrete short leg shear wall by the non-engineering axis force[D]. Nanning: Guangxi University, 2015. 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ArticleFig(id=1245390163254297465, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 1, caption=

Specimen parameters and the comparison between the finite element results and the test results of peak load and ultimate displacement of skeleton curves

, figureFileSmall=null, figureFileBig=null, tableContent=
文献编号λntfc,k/MPa试件截面尺寸H×B×hf×tw×h/m破坏形态试验值有限元Pmax,t/Pmax,aΔu,t/Δu,a
Pmax,t/kNΔu,t/mmPmax,a/kNΔu,a/mm
正向负向正向负向正向负向正向负向正向负向正向负向
[15]SRC-T53.090.43136.90.5×0.5×0.1×0.1×1.4弯曲256.60253.8038.7038.00235.04226.8040.0040.001.091.120.970.95
SRC-T62.560.41736.90.6×0.6×0.1×0.1×1.6剪切302.70289.3033.4032.00275.20294.5033.2536.001.100.981.000.89
[16]TW21.670.15036.50.6×0.6×0.1×0.1×1.0弯剪560.05530.1116.8617.08536.84578.7818.8820.501.040.920.890.83
), ArticleFig(id=1245390163388515198, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表1, caption=

试件参数及骨架曲线峰值荷载-极限位移模拟结果与试验结果对比

, figureFileSmall=null, figureFileBig=null, tableContent=
文献编号λntfc,k/MPa试件截面尺寸H×B×hf×tw×h/m破坏形态试验值有限元Pmax,t/Pmax,aΔu,t/Δu,a
Pmax,t/kNΔu,t/mmPmax,a/kNΔu,a/mm
正向负向正向负向正向负向正向负向正向负向正向负向
[15]SRC-T53.090.43136.90.5×0.5×0.1×0.1×1.4弯曲256.60253.8038.7038.00235.04226.8040.0040.001.091.120.970.95
SRC-T62.560.41736.90.6×0.6×0.1×0.1×1.6剪切302.70289.3033.4032.00275.20294.5033.2536.001.100.981.000.89
[16]TW21.670.15036.50.6×0.6×0.1×0.1×1.0弯剪560.05530.1116.8617.08536.84578.7818.8820.501.040.920.890.83
), ArticleFig(id=1245390163510150019, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 2, caption=

Criterion of ultimate failure mode of components

, figureFileSmall=null, figureFileBig=null, tableContent=
负向破坏形态负向加载构件有效剪切应变绝对值X正向破坏形态正向加载构件有效剪切应变绝对值Y最终破坏形态
弯剪破坏X < 0.010剪切破坏Y≥ 0.08剪切破坏
(弯曲变形主控)弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08弯剪破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯曲破坏
弯曲破坏Y < 0.03弯曲破坏
弯剪破坏0.010 ≤ X < 0.015剪切破坏Y ≥ 0.08剪切破坏
(剪切变形主控)弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08剪切破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯剪破坏
弯曲破坏Y < 0.03弯剪破坏
剪切破坏X ≥ 0.015剪切破坏Y ≥ 0.08剪切破坏
弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08剪切破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯剪破坏
弯曲破坏Y < 0.03弯剪破坏
), ArticleFig(id=1245390163665339272, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表2, caption=

构件最终破坏形态判别标准

, figureFileSmall=null, figureFileBig=null, tableContent=
负向破坏形态负向加载构件有效剪切应变绝对值X正向破坏形态正向加载构件有效剪切应变绝对值Y最终破坏形态
弯剪破坏X < 0.010剪切破坏Y≥ 0.08剪切破坏
(弯曲变形主控)弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08弯剪破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯曲破坏
弯曲破坏Y < 0.03弯曲破坏
弯剪破坏0.010 ≤ X < 0.015剪切破坏Y ≥ 0.08剪切破坏
(剪切变形主控)弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08剪切破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯剪破坏
弯曲破坏Y < 0.03弯剪破坏
剪切破坏X ≥ 0.015剪切破坏Y ≥ 0.08剪切破坏
弯剪破坏(剪切变形主控)0.06 ≤ Y < 0.08剪切破坏
弯剪破坏(弯曲变形主控)0.03 ≤ Y < 0.06弯剪破坏
弯曲破坏Y < 0.03弯剪破坏
), ArticleFig(id=1245390163803751311, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 3, caption=

Discriminant criterion of failure mode of T-shaped SRC shear wall before and after modification

, figureFileSmall=null, figureFileBig=null, tableContent=
修正前SRC剪力墙破坏形态划分准则修正后SRC剪力墙破坏形态划分准则
剪跨比(λ轴压比(n弯剪比(m破坏形态剪跨比(λ轴压比(n弯剪比(m破坏形态
λ =1.5n<0.10m>1.26剪切破坏λ≤1.5n≤0.10m<1.25弯剪破坏
m<1.26弯剪破坏m≥1.25剪切破坏
0.10<n<0.25m>1.20剪切破坏0.10<n≤0.25m<1.20弯剪破坏
m<1.20弯剪破坏m≥1.20剪切破坏
0.25<n<0.45m>1.15剪切破坏0.25<n≤0.45m<1.15弯剪破坏
m<1.15弯剪破坏m≥1.15剪切破坏
n>0.45m>1.10剪切破坏n>0.45m>1.10剪切破坏
λ =2.0n<0.10m<1.10弯曲破坏1.5<λ≤2.0n≤0.10m<1.10弯曲破坏
m>1.10弯剪破坏m≥1.10弯剪破坏
0.10<n<0.25m<1.16弯曲破坏0.10<n≤0.25m<1.15弯曲破坏
m>1.16弯剪破坏m≥1.15弯剪破坏
0.25<n<0.45m<0.98弯曲破坏0.25<n≤0.45m<0.98弯曲破坏
0.98<m<1.26弯剪破坏0.98≤m<1.25弯剪破坏
m>1.26剪切破坏m≥1.25剪切破坏
n>0.45m>1.07剪切破坏n>0.45m<1.07弯剪破坏
m<1.07弯剪破坏m≥1.07剪切破坏
λ =2.5n<0.10m<1.21弯曲破坏2.0<λ≤2.5n≤0.10m<1.06弯曲破坏
m>1.21弯剪破坏m≥1.06弯剪破坏
0.10<n<0.25m<1.02弯曲破坏0.10<n≤0.25m<1.00弯曲破坏
m>1.02弯剪破坏m≥1.00弯剪破坏
0.25<n<0.45m<0.92弯曲破坏0.25<n≤0.45m<0.92弯曲破坏
0.92<m<1.12弯剪破坏0.92≤m<1.12弯剪破坏
m>1.12剪切破坏m≥1.12剪切破坏
n>0.45m>1.09剪切破坏n>0.45m<1.09弯剪破坏
m<1.09弯剪破坏m≥1.09剪切破坏
), ArticleFig(id=1245390163937969042, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表3, caption=

修正前后T形截面SRC剪力墙破坏形态划分准则

, figureFileSmall=null, figureFileBig=null, tableContent=
修正前SRC剪力墙破坏形态划分准则修正后SRC剪力墙破坏形态划分准则
剪跨比(λ轴压比(n弯剪比(m破坏形态剪跨比(λ轴压比(n弯剪比(m破坏形态
λ =1.5n<0.10m>1.26剪切破坏λ≤1.5n≤0.10m<1.25弯剪破坏
m<1.26弯剪破坏m≥1.25剪切破坏
0.10<n<0.25m>1.20剪切破坏0.10<n≤0.25m<1.20弯剪破坏
m<1.20弯剪破坏m≥1.20剪切破坏
0.25<n<0.45m>1.15剪切破坏0.25<n≤0.45m<1.15弯剪破坏
m<1.15弯剪破坏m≥1.15剪切破坏
n>0.45m>1.10剪切破坏n>0.45m>1.10剪切破坏
λ =2.0n<0.10m<1.10弯曲破坏1.5<λ≤2.0n≤0.10m<1.10弯曲破坏
m>1.10弯剪破坏m≥1.10弯剪破坏
0.10<n<0.25m<1.16弯曲破坏0.10<n≤0.25m<1.15弯曲破坏
m>1.16弯剪破坏m≥1.15弯剪破坏
0.25<n<0.45m<0.98弯曲破坏0.25<n≤0.45m<0.98弯曲破坏
0.98<m<1.26弯剪破坏0.98≤m<1.25弯剪破坏
m>1.26剪切破坏m≥1.25剪切破坏
n>0.45m>1.07剪切破坏n>0.45m<1.07弯剪破坏
m<1.07弯剪破坏m≥1.07剪切破坏
λ =2.5n<0.10m<1.21弯曲破坏2.0<λ≤2.5n≤0.10m<1.06弯曲破坏
m>1.21弯剪破坏m≥1.06弯剪破坏
0.10<n<0.25m<1.02弯曲破坏0.10<n≤0.25m<1.00弯曲破坏
m>1.02弯剪破坏m≥1.00弯剪破坏
0.25<n<0.45m<0.92弯曲破坏0.25<n≤0.45m<0.92弯曲破坏
0.92<m<1.12弯剪破坏0.92≤m<1.12弯剪破坏
m>1.12剪切破坏m≥1.12剪切破坏
n>0.45m>1.09剪切破坏n>0.45m<1.09弯剪破坏
m<1.09弯剪破坏m≥1.09剪切破坏
), ArticleFig(id=1245390164072186779, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 4, caption=

Discriminant criterion accuracy of T-shaped SRC shear wall failure mode

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态判断正确数目/个构件总数/个准确率/%
弯曲破坏748587.1
弯剪破坏11612890.6
剪切破坏10411094.5
), ArticleFig(id=1245390164269319071, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表4, caption=

T形截面SRC剪力墙破坏形态判别准则准确率

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态判断正确数目/个构件总数/个准确率/%
弯曲破坏748587.1
弯剪破坏11612890.6
剪切破坏10411094.5
), ArticleFig(id=1245390164378370980, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 5, caption=

Division criterion of performance state deformation limit of SRC shear wall with T-shapecl section

, figureFileSmall=null, figureFileBig=null, tableContent=
性能状态混凝土压应变型钢拉压应变型钢剪应变纵筋拉压应变承载力
基本完好0.0020.0020.0020.002
轻微损坏0.0040.0150.0050.015
轻中等破坏
中等破坏0.0050.0600.0150.0500.95Pmax
比较严重破坏≤ 1.5εcu0.0800.0250.0800.85Pmax
严重破坏0.1000.0300.1000.70Pmax
), ArticleFig(id=1245390164617446316, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表5, caption=

T形截面SRC剪力墙性能状态变形限值划分准则

, figureFileSmall=null, figureFileBig=null, tableContent=
性能状态混凝土压应变型钢拉压应变型钢剪应变纵筋拉压应变承载力
基本完好0.0020.0020.0020.002
轻微损坏0.0040.0150.0050.015
轻中等破坏
中等破坏0.0050.0600.0150.0500.95Pmax
比较严重破坏≤ 1.5εcu0.0800.0250.0800.85Pmax
严重破坏0.1000.0300.1000.70Pmax
), ArticleFig(id=1245390164747469745, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 6, caption=

Calculation formula and correlation coefficient of displacement angle limit under different failure modes

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏类型构件性能状态各性能状态位移角限值公式相关系数
剪切破坏基本完好θ1e =(1.58+0.3λ-0.57n+7.08ρs)×10-30.56
轻微破坏θ2 =(1.75+6.64ρw+13.39ρs)×10-30.53
轻中等破坏θ3 =(6.61+1.08λ-2.67n-14.35ρw)×10-30.66
中等破坏θ4 =(11.42+2.22λ-5.37n-34.39ρw+4.05λv-39.1ρs)×10-30.71
比较严重破坏θ5 =(12.98+2.45λ-5.48n-43.82ρw+11.12λv-35.03ρs)×10-30.74
严重破坏θ6 =(12.82+3.22λ-5.12n-38.29ρw+16.84λv)×10-30.71
弯剪破坏基本完好θ1e =(1.67+0.78n+37.61ρs)×10-30.63
轻微破坏θ2 =(2.46-0.41λ+0.58n+19.43ρs)×10-30.56
轻中等破坏θ3 =(4.34+3.47λ-5.18n-32.08ρw-36.05ρs)×10-30.70
中等破坏θ4 =(7.07+7.28λ-11.17n-72.57ρw-108.73ρs)×10-30.70
比较严重破坏θ5 =(10.23+6.93λ-12.53n-68.76ρw+12.88λv-99.72ρs)×10-30.70
严重破坏θ6 =(13.71+5.87λ-8.89n-75.10ρw+14.97λv)×10-30.62
弯曲破坏基本完好θ1e =(3.37-0.39λ+5.28ρw+12.19ρs)×10-30.55
轻微破坏θ2 =(2.45-0.41λ+0.55n+9.12ρw+1.1λv)×10-30.58
轻中等破坏θ3 =(-2.28+5.12λ-3.43n+9.7ρs)×10-30.74
中等破坏θ4 =(-5.52+10.37λ-7.21n+18.47λv)×10-30.75
比较严重破坏θ5 =(4.55+8.89λ-14.25n+23.8λv)×10-30.74
严重破坏θ6 =(16.04+8.05λ-24.71n-68.86ρw+20.31λv)×10-30.74
), ArticleFig(id=1245390164877493174, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表6, caption=

不同破坏模式下各性能状态位移角限值计算公式和相关系数

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏类型构件性能状态各性能状态位移角限值公式相关系数
剪切破坏基本完好θ1e =(1.58+0.3λ-0.57n+7.08ρs)×10-30.56
轻微破坏θ2 =(1.75+6.64ρw+13.39ρs)×10-30.53
轻中等破坏θ3 =(6.61+1.08λ-2.67n-14.35ρw)×10-30.66
中等破坏θ4 =(11.42+2.22λ-5.37n-34.39ρw+4.05λv-39.1ρs)×10-30.71
比较严重破坏θ5 =(12.98+2.45λ-5.48n-43.82ρw+11.12λv-35.03ρs)×10-30.74
严重破坏θ6 =(12.82+3.22λ-5.12n-38.29ρw+16.84λv)×10-30.71
弯剪破坏基本完好θ1e =(1.67+0.78n+37.61ρs)×10-30.63
轻微破坏θ2 =(2.46-0.41λ+0.58n+19.43ρs)×10-30.56
轻中等破坏θ3 =(4.34+3.47λ-5.18n-32.08ρw-36.05ρs)×10-30.70
中等破坏θ4 =(7.07+7.28λ-11.17n-72.57ρw-108.73ρs)×10-30.70
比较严重破坏θ5 =(10.23+6.93λ-12.53n-68.76ρw+12.88λv-99.72ρs)×10-30.70
严重破坏θ6 =(13.71+5.87λ-8.89n-75.10ρw+14.97λv)×10-30.62
弯曲破坏基本完好θ1e =(3.37-0.39λ+5.28ρw+12.19ρs)×10-30.55
轻微破坏θ2 =(2.45-0.41λ+0.55n+9.12ρw+1.1λv)×10-30.58
轻中等破坏θ3 =(-2.28+5.12λ-3.43n+9.7ρs)×10-30.74
中等破坏θ4 =(-5.52+10.37λ-7.21n+18.47λv)×10-30.75
比较严重破坏θ5 =(4.55+8.89λ-14.25n+23.8λv)×10-30.74
严重破坏θ6 =(16.04+8.05λ-24.71n-68.86ρw+20.31λv)×10-30.74
), ArticleFig(id=1245390165007516603, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 7, caption=

Failure probability of each performance state under three failure modes

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态失效概率性能状态
基本完好轻微损坏轻中等破坏中等破坏比较严重破坏严重破坏
剪切破坏修正前60.025.751.355.847.821.2
修正后26.6(0.95θ1e,c23.0(0.95θ3,c28.3(0.95θ4,c13.3(0.90θ5,c13.3(0.87θ6,c
弯剪破坏修正前58.367.773.274.044.933.9
修正后29.9(0.90θ1e,c23.6(0.95θ2,c22.1(0.98θ3,c21.3(0.98θ4,c18.9(0.87θ5,c13.4(0.85θ6,c
弯曲破坏修正前64.765.914.221.225.949.4
修正后29.9(0.98θ1e,c23.6(0.95θ2,c19.1(0.80θ5,c13.4(0.80θ6,c
), ArticleFig(id=1245390165133345724, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表7, caption=

3种破坏形态下各性能状态失效概率

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态失效概率性能状态
基本完好轻微损坏轻中等破坏中等破坏比较严重破坏严重破坏
剪切破坏修正前60.025.751.355.847.821.2
修正后26.6(0.95θ1e,c23.0(0.95θ3,c28.3(0.95θ4,c13.3(0.90θ5,c13.3(0.87θ6,c
弯剪破坏修正前58.367.773.274.044.933.9
修正后29.9(0.90θ1e,c23.6(0.95θ2,c22.1(0.98θ3,c21.3(0.98θ4,c18.9(0.87θ5,c13.4(0.85θ6,c
弯曲破坏修正前64.765.914.221.225.949.4
修正后29.9(0.98θ1e,c23.6(0.95θ2,c19.1(0.80θ5,c13.4(0.80θ6,c
), ArticleFig(id=1245390165250786241, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 8, caption=

Deformation limit table of T-shaped section SRC shear wall in various performance states

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态性能状态变形限值
θ1eθ2θ3θ4θ5θ6
剪切破坏0.00230.00250.0060.0110.0140.019
弯剪破坏0.00290.00210.0080.0120.0160.021
弯曲破坏0.00310.00230.0130.0180.0220.024
), ArticleFig(id=1245390165372421062, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表8, caption=

T形截面SRC剪力墙在各性能状态变形限值表

, figureFileSmall=null, figureFileBig=null, tableContent=
破坏形态性能状态变形限值
θ1eθ2θ3θ4θ5θ6
剪切破坏0.00230.00250.0060.0110.0140.019
弯剪破坏0.00290.00210.0080.0120.0160.021
弯曲破坏0.00310.00230.0130.0180.0220.024
), ArticleFig(id=1245390165515027399, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 9, caption=

Specimen parameters

, figureFileSmall=null, figureFileBig=null, tableContent=
参考文献试件编号剪跨比轴压比纵向钢筋配筋率/%截面腹板配钢率/%全截面配钢率/%配钢类型破坏形态
文献[15]SRC-T53.090.4312.563.653.65槽钢、扁钢弯曲破坏
SRC-T62.560.4172.483.043.04槽钢、扁钢剪切破坏
文献[16]TW42.170.1502.363.4810.40槽钢、扁钢弯剪破坏
文献[28]SRCTW12.200.1001.390.561.81工字钢弯曲破坏
SRCTW22.200.2001.390.561.81工字钢弯曲破坏
文献[29]SRCW-12.170.0500.500.602.39H型钢弯剪破坏
SRCW-22.170.0500.500.602.39H型钢弯剪破坏
SRCW-32.170.0500.500.602.39H型钢弯剪破坏
), ArticleFig(id=1245390165632467916, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表9, caption=

试件参数

, figureFileSmall=null, figureFileBig=null, tableContent=
参考文献试件编号剪跨比轴压比纵向钢筋配筋率/%截面腹板配钢率/%全截面配钢率/%配钢类型破坏形态
文献[15]SRC-T53.090.4312.563.653.65槽钢、扁钢弯曲破坏
SRC-T62.560.4172.483.043.04槽钢、扁钢剪切破坏
文献[16]TW42.170.1502.363.4810.40槽钢、扁钢弯剪破坏
文献[28]SRCTW12.200.1001.390.561.81工字钢弯曲破坏
SRCTW22.200.2001.390.561.81工字钢弯曲破坏
文献[29]SRCW-12.170.0500.500.602.39H型钢弯剪破坏
SRCW-22.170.0500.500.602.39H型钢弯剪破坏
SRCW-32.170.0500.500.602.39H型钢弯剪破坏
), ArticleFig(id=1245390165758297040, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=EN, label=Table 10, caption=

Ratio statistics of formula fitting values and test values of θ1e~θ5 displacement angle limit

, figureFileSmall=null, figureFileBig=null, tableContent=
统计指标θ1e,s/θ1e,tθ2,s/θ2,tθ3,s/θ3,tθ4,s/θ4,tθ5,s/θ5,t
最大值0.4830.5820.7010.8960.955
最小值0.2910.2880.4180.5740.703
均值0.3770.3750.5350.7500.862
标准差0.0790.0970.0920.0950.098
方差0.0060.0090.0080.0090.009
), ArticleFig(id=1245390165875737555, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390150126125315, language=CN, label=表10, caption=

试件θ1e~θ5位移角限值的拟合式计算值与试验值比值统计

, figureFileSmall=null, figureFileBig=null, tableContent=
统计指标θ1e,s/θ1e,tθ2,s/θ2,tθ3,s/θ3,tθ4,s/θ4,tθ5,s/θ5,t
最大值0.4830.5820.7010.8960.955
最小值0.2910.2880.4180.5740.703
均值0.3770.3750.5350.7500.862
标准差0.0790.0970.0920.0950.098
方差0.0060.0090.0080.0090.009
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型钢混凝土T形截面剪力墙基于性能的变形限值研究
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彭修宁 1 , 邓敬旻 1 , 林焯铭 1 , 林有超 1, 2
地震工程与工程振动 | 2024,44(4): 89-103
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地震工程与工程振动 | 2024, 44(4): 89-103
型钢混凝土T形截面剪力墙基于性能的变形限值研究
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彭修宁1 , 邓敬旻1, 林焯铭1, 林有超1, 2
作者信息
  • 1.广西大学 土木建筑工程学院,广西 南宁 530000
  • 2.广西建工第五建筑工程集团有限公司,广西 南宁 530000
  • 彭修宁(1973—),男,教授,博士,主要从事钢结构的抗震及脆断性能研究。E-mail:

通讯作者:

林有超(1982—),男,高级工程师,硕士,主要从事结构工程的设计和研究。E-mail:
Study on deformation limit index of steel reinforced concrete T-shaped shear wall based on performance
Xiuning PENG1 , Jingmin DENG1, Zhuoming LIN1, Youchao LIN1, 2
Affiliations
  • 1.School of Civil and Architectural Engineering, Guangxi University, Nanning 530000, China
  • 2.Guangxi Construction Fifth Construction Engineering Co., Ltd., Nanning 530000, China
doi: 10.13197/j.eeed.2024.0409
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为更好地评估T形截面型钢混凝土(steel reinforced concrete,SRC)剪力墙变形性能,采用ABAQUS有限元软件对按照规范设计的324个T形截面SRC剪力墙构件的破坏形态和变形性能进行研究,根据收集的试验数据分析构件的破坏形态,提出T形截面SRC剪力墙的破坏形态划分准则;以构件的各材料应变极限值为准则来判别构件的性能状态,考虑轴压比、剪跨比、弯剪比、腹板暗柱配钢率、暗柱纵筋配筋率及箍筋暗柱特征值对构件变形性能的影响。对不同性能状态变形限值和参数进行线性回归分析,得到不同破坏类型下各性能状态位移角限值计算式;按规范ASCE 41修正各性能状态变形限值的失效概率,得到具有15%、20%、35%失效概率保证的各性能状态变形限值取值表。研究表明:剪跨比、轴压比对构件各性能状态位移角限值影响较大,暗柱腹板配钢率、纵筋配筋率及箍筋特征值对构件位移角限值影响相对较小,但能提高其延性。按规范ASCE 41修正后的位移角限值取值较为合理且有一定的安全储备。为T形截面SRC剪力墙基于性能的抗震设计与性能评估提供参考。

有限元分析  /  T形截面SRC剪力墙  /  变形性能  /  破坏形态  /  位移角限值

In order to better evaluate the T-shaped steel reinforced concrete(SRC) shear walls with the widespread application of steel reinforced concrete members deformation behavior, ABAQUS was used to study the failure morphology and deformation behavior of 324 T-shaped SRC shear wall designed according to specification. Based on to the collected test data, the failure mode of the members is analyzed, and the failure mode division criteria of T-shaped SRC shear wall is proposed. Based on the strain limit value of each material of the member, the component performance is judged, and the influence of axial compression ratio, shear span ratio, flexure shear ratio, steel ratio of the concealed column of the web, longitudinal reinforcement ratio of the concealed column and the characteristic value of the stirrup concealed column on the component deformation performance is considered. Through linear regression analysis of deformation limits and parameters in different performance states, the calculation formula of displacement angle limits in different performance states under different failure types is obtained. The failure probability of each performance state deformation limit is corrected according to ASCE 41, and the value table of each performance state deformation limit with 15%, 20% and 35% failure probability guarantee is obtained. The research shows that the shear span ratio and axial compression ratio have greate impact on component displacement angle limit of each performance state, while the steel ratio of the concealed column web, the longitudinal reinforcement ratio and the characteristic value of the stirrup have relatively small impact on the displacement angle limit of the member, but can improve its ductility. The limit value of displacement angle corrected according to ASCE 41 is reasonable and has certain safety reserves. It provides reference for performance-based seismic design and performance evaluation of T-shaped SRC shear wall.

finite element analysis  /  T-shaped SRC shear wall  /  deformation performance  /  failure mode  /  displacement angle limit
彭修宁, 邓敬旻, 林焯铭, 林有超. 型钢混凝土T形截面剪力墙基于性能的变形限值研究. 地震工程与工程振动, 2024 , 44 (4) : 89 -103 . DOI: 10.13197/j.eeed.2024.0409
Xiuning PENG, Jingmin DENG, Zhuoming LIN, Youchao LIN. Study on deformation limit index of steel reinforced concrete T-shaped shear wall based on performance[J]. Earthquake Engineering and Engineering Dynamics, 2024 , 44 (4) : 89 -103 . DOI: 10.13197/j.eeed.2024.0409
随着我国城镇化的推进,城市用地紧张,超高层和高层建筑的数量也在逐年增长,建筑对构件抗震要求也越高,剪力墙(抗侧力构件)由于其抗震性能好、承载力高等特点,被广泛应用于超高层和高层建筑。但由于混凝土构件的自重相对较大,传统的钢筋混凝土剪力墙需要截面尺寸足够大才能够确保结构的安全和稳定,这会浪费许多使用空间。因此许多学者提出了外包钢板、内嵌型钢或钢板的剪力墙构件,以此来改变剪力墙的承载能力及抗震性能。外包钢板的四边连接钢板剪力墙容易发生面外屈曲,对框架柱的要求较高[1-2];改用两边连接钢板剪力墙可使其侧边受到约束,部分屈曲得到限制,可避免四边连接平钢板剪力墙的缺点[3-4];双钢板组合剪力墙可以有效减小结构层间位移,降低剪力墙塑性耗能,对结构抗震更有利[5-6];内置型钢或钢板的混凝土剪力墙由于其连接构造简单,施工技术成熟而拥有更广泛的应用前景[7-8]
目前型钢混凝土(steel reinforced concrete,SRC)剪力墙构件在工程应用中较为广泛,参考国外基于构件变形性能的设计方法及较为成熟的构件性能量化方法[9-11],国内在“一字形”型钢混凝土剪力墙基于性能的变形限值研究已有学者作出了成果[12-14],而对T形截面SRC剪力墙基于性能的变形限值仍需进一步研究。T形截面SRC剪力墙构件具有增强平面外的刚度、提高延性和承载力等优点,对其基于性能的变形限值研究可为实际工程抗震性能设计提供参考,可推广T形截面SRC剪力墙在超高层和高层建筑中的应用。
型钢混凝土T形截面剪力墙基于性能的变形限值研究需要构建大量的试件以进行统计和回归分析,使用有限元软件建模可获得大量样本数据以减少试验成本,对研究试件变形、损伤等具备明显优势。为验证T形SRC剪力墙有限元数值模拟结果的可靠性,从文献[15-16]中收集3个T形SRC剪力墙试件,并采用ABAQUS建模。其中,混凝土和钢材的本构模型分别采用损伤塑性和二折线模型,混凝土单元类型选择8节点6面体缩减积分单元C3D8R,型钢选用4节点减缩积分S4R壳单元,钢筋选用三维桁架单元T3D2,型钢与混凝土连接采用内嵌形式,试件参数见表1
在构件抗震性能研究中,加载方式通常采用低周往复加载模式或单调加载模式。前者能够较真实地反映构件的累计损伤,后者无法考虑另一加载方向的累计损伤。根据文献[17]可知,模型单调加载与往复加载所得的骨架曲线在峰值承载力处误差一般不超过10%,由于文中模型尺寸相对较大且数量较多,考虑到精度及时间成本,文章选用正、负向的单调加载模式,并按位移控制进行加载。其中,正向加载为腹板受拉和翼缘受压、负向加载为腹板受压和翼缘受拉。单调加载所得3个试件骨架曲线的有限元模拟结果与试验结果对比如图1所示。
图1可知,试件骨架曲线的有限元模拟结果与试验结果吻合较好。现将有限元模拟结果与试验结果的峰值荷载及极限位移进行对比:对于弯曲主控型构件,取0.85倍峰值荷载对应的位移作为该类构件的极限位移;对于剪切主控型构件,根据文献[18]的结论,混凝土剪应变达到0.015时,构件基本达到极限承载力和极限位移,故取剪应变达到0.015时对应的位移作为该类构件的极限位移。将所得各试件峰值荷载、极限位移的模拟结果与试验结果对比列入表1。由表1可知,试件峰值荷载、极限位移的试验结果与有限元结果误差基本在15%以内,说明有限元软件能较好地模拟T形截面SRC剪力墙的破坏形态和损伤状态。
为了研究型钢混凝土T形截面剪力墙基于性能的变形限值取值,本文根据GB 50011—2010《建筑抗震设计规范》[19]、JGJ 138—2016《组合结构设计规范》[20]设计了324个型钢混凝土T形剪力墙试件。其中,T形截面腹板高度、翼缘宽度均为1500 mm;翼缘和腹板厚度为250 mm;翼缘两端和中部、腹板端部设置构造暗柱;型钢采用Q345级H形截面钢;混凝土等级为C40;钢筋采用HRP400。试件截面及有限元模型边界条件设定如图2所示。
控制参数选择剪跨比、轴压比、弯剪比、腹板暗柱配钢率、暗柱纵筋配筋率及箍筋特征值。其中各参数设计如下:剪跨比λ为1.5、2.0、2.5;轴压比设计值nd为0.10、0.25、0.45、0.55;轴压力水平设计值按式(1)计算:
式中:nd为试件轴压比设计值;fcd为混凝土抗压强度设计值;fad为型钢屈服强度设计值;Ac为混凝土截面面积;Aa为型钢全截面面积。型钢截面尺寸分别为100 mm×100 mm×12 mm×12 mm、125 mm×125 mm×13 mm×13 mm、150 mm×150 mm×15 mm×15 mm;腹板无翼缘端部配钢率为4.01%、5.50%、7.60%;暗柱纵向钢筋配筋率为1.33%、2.08%、3.25%;暗柱箍筋特征值按式(2)计算:
式中:ρv为暗柱体积配箍率;fsv为暗柱箍筋抗拉强度设计值;fc混凝土抗压强度设计值。选用箍筋强度等级为HRP400,直径为8、10、12 mm,对应的箍筋特征值为0.12、0.20、0.27。
T形截面SRC剪力墙的变形限值研究与其破坏形态密切相关,包括剪切破坏、弯剪破坏及弯曲破坏3种。与试验中判断构件破坏形态的方式不同,有限元分析不能直观地看出试件各材料的破坏现象,为了方便后续判断T形截面SRC剪力墙试件可能发生的破坏形态,需依据有限元参数事先定义T形截面剪力墙破坏形态的有限元结果判别标准,参数包括各材料应变分量、屈服分布及损伤情况等。其中,TW2试件试验结果与有限元结果对比如图3所示。由图可知,PEEQ为材料塑性应变累积结果,称为等效塑性应变。PEEQ数值大于0代表该材料在积分点处发生屈服;AC YIELD表示积分点处的屈服指标,0表示积分点处未屈服、1表示积分点处已屈服。由图3(a)~(c)可知,TW2试件有限元结果中混凝土等效塑性应变集中在构件翼缘脚部,这与实际试验中混凝土压溃区的位置基本一致;且有限元结果中混凝土屈服分布与试验现象基本一致,且与竖直方向成45°角,说明上述有限元参数可用于判别T形截面SRC剪力墙的破坏形态。
为了得到T形截面剪力墙破坏形态的有限元结果判别标准,根据弯剪比、剪跨比和轴压比另外设计了68个有限元试件(按正负加载方向划分共有136个模型),按上述有限元参数(各材料应变分量、屈服分布及损伤情况)来分析其破坏形态。结果发现,当负向加载(腹板受压)时,试件仅发生剪切和弯剪破坏;当正向加载(腹板受拉)时,试件会发生剪切、弯剪及弯曲破坏;且当试件达到极限状态时,试件无翼缘端腹板底部的有效剪切应变(LE23)绝对值的最大值在一定程度上可反映试件的剪切变形程度;LE23+表示正向加载试件达到极限状态时对应的有效剪切应变绝对值为Y,LE23-表示负向加载试件达到极限状态时对应的有效剪切应变绝对值为X;LE23的绝对值越大,试件越容易发生剪切破坏;LE23的绝对值越小,试件越容易发生弯曲或弯剪破坏(弯曲变形主控),结果如图4所示。
图4可知,负向加载下,构件有效剪切应变绝对值小于0.010时,大部分构件发生弯剪破坏(弯曲变形主控),X大于0.015时,大部分构件发生剪切破坏。X介于0.010与0.015之间时,构件以发生弯剪破坏(剪切变形主控)居多;正向加载下,构件有效剪应变绝对值Y小于0.03时,大部分构件发生弯曲破坏。Y大于0.08时,绝大部分试件发生剪切破坏。Y介于0.06与0.08之间时,大部分构件发生弯剪破坏(剪切变形主控)。Y介于0.03与0.06之间时,大部分构件发生弯剪破坏(弯曲变形主控)。根据上述分析结果,得到构件的最终破坏形态判别标准,如表2所示。
根据表2构件最终破坏形态判别标准对1.2节设计的324个型钢混凝土T形截面剪力墙试件进行破坏形态的划分,并形成基于弯剪比、剪跨比和轴压比的试件破坏形态划分准则。对324个T形截面SRC剪力墙试件的有限元结果进行分析发现,共有85个试件发生弯曲破坏,128个试件发生弯剪破坏,110个试件发生剪切破坏。轴压比、剪跨比、弯剪比与构件破坏形态、破坏形态数目的关系如图5图6所示。
图5(a)可知,随剪跨比λ增大,试件破坏形态逐渐由剪切主控型转为弯曲主控型。当λ = 1.5时,试件主要发生剪切破坏;当λ =2.5时,试件主要发生弯曲破坏,原因是随剪跨比增大,构件承载能力退化放缓,破坏逐渐转为弯曲主控型;由图5(b)可知,随轴压比增大,发生弯曲破坏的试件减少,发生剪切、弯剪破坏的试件增多,原因是随轴压比增大,构件刚度退化较快、延性下降,破坏逐渐转为剪切主控型;由图5(c)可知,随弯剪比增大,弯曲破坏主控型试件的占比逐渐减少。弯剪比小于0.95时,试件主要发生弯曲破坏;弯剪比大于1.4时,试件主要发生剪切破坏;弯剪比介于1.0~1.1时,试件主要发生弯剪破坏。
图6(a)可知,当λ =1.5时,随着弯剪比、轴压比增大,发生剪切破坏的试件占比逐渐增多,原因是极限位移角逐渐减小,且混凝土和抗剪钢筋的承载力有限,试件所受剪切变形增大;由图6(b)可知,当λ =2.0时,随弯剪比增大,发生弯曲破坏的试件占比逐渐减少,而发生弯剪破坏、剪切破坏的试件占比相应增多;由图6(c)可知,当λ =2.5时,随弯剪比和轴压比增大,发生弯曲破坏的试件逐渐减少,发生弯剪破坏的试件增多。根据图5图6分析结果划分T形截面SRC剪力墙破坏形态,结果如表3所示。
由于在划分构件破坏形态时,弯剪破坏与弯曲破坏、剪切破坏与弯剪破坏之间难以通过现象等因素进行明确划分,偏于安全考虑,将部分发生弯剪破坏的试件划分为剪切破坏、部分发生弯曲破坏的试件划分为弯剪破坏,同时尽可能保证划分区间内对应的破坏形态占比较高。为保证判别的可靠性,取剪跨比区间为λ≤1.5、1.5<λ≤2.0、2.0<λ≤2.5;取轴压比区间为n≤0.10、0.10<n≤0.25、0.25<n≤0.45、n>0.45,得到修正后的T形SRC剪力墙破坏形态划分准则如表3所示。
为验证修正后的SRC剪力墙破坏形态划分准则的合理性,根据表3修正后的SRC剪力墙破坏形态划分准则,对经过表2有限元结果参数判断后的85个发生弯曲破坏的试件、128个发生弯剪破坏的试件和110个发生剪切破坏试件重新进行破坏形态划分,得到T形截面SRC剪力墙破坏形态划分准则准确率如表4所示。由表4可知,采用修正后的SRC剪力墙破坏形态划分准则进行判断,共有74个试件发生弯曲破坏、116个试件发生弯剪破坏、104个试件发生剪切破坏,3种破坏形态的判断正确数目分别为原构件总数的87.1%、90.6%、94.5%,构件破坏形态判断准确率均大于85%,满足实际工程需要。
根据GB 50011—2010《建筑抗震设计规范》[19]和JGJ 3—2010《高层建筑混凝土结构技术规程》[21]关于构件抗震性能和变形限值的划分标准,将构件划分为基本完好、轻微损坏、轻中等破坏、中等破坏、比较严重破坏、严重破坏和失效共7个性能状态及6个限值点,构件性能水平划分如图7所示。
PRIESTLEY等[22]考虑了材料微观变形现象及其应变对构件性能状态和变形限值的影响,并通过大量试验的应变数据分析各参数对构件的承载力、塑性区转角和位移角等影响,确定了构件的性能状态和变形限值。因此本文选用构件材料应变和承载力作为构件损伤的判别基础,以塑性位移角作为构件变形的量化指标,研究构件在不同性能状态下的位移角限值。
1)基本完好性能状态
在GB 50011—2010《建筑抗震设计规范》[19]中规定该性能状态下的构件处于弹性阶段,变形限值为弹性位移角。PRIESTLEY等[22]指出该性能状态下构件混凝土压应变已到达0.002,且构件内部出现细微裂缝,但卸载后裂缝能够闭合。对于普通的HRB400钢筋和Q345型钢,其屈服应变约为0.002,因此该性能点钢筋和型钢的变形限值取其拉应变为0.002;对于剪切变形主控的试件,其微观表现为水平钢筋、箍筋及型钢受剪切作用而发生屈服,由于型钢剪切应变与受拉屈服应变相等,故该性能点箍筋和水平钢筋的变形限值取其屈服应变为0.002,型钢的变形限值也取其剪应变为0.002。
2)轻微损坏状态
在GB 50011—2010《建筑抗震设计规范》[19]中规定该性能状态下构件经修理后均可继续使用;而PRIESTLEY等[22]认为正常使用极限状态的构件表观现象为表面有部分损伤,不影响承载力也不需要修复,该性能点的混凝土压应变为0.004,钢筋拉压应变为0.015;因此该性能点的混凝土变形限值取其压应变为0.004,纵向钢筋变形限值取其拉应变为0.015。对于弯曲变形主控的构件,该状态下靠近混凝土边缘的型钢翼缘也有可能屈服,因此该性能点型钢变形限值取其拉应变为0.010。对于剪切变形主控的构件,虽然型钢有一定的剪切变形和延性,但为了控制其剪切损伤,需将其延性系数严格控制在1~2,因此该性能点型钢变形限值取其剪应变为0.005。
3)轻中等破坏状态
该性能状态变形介于轻微损坏和中等破坏之间,其变形限值取2种状态变形限值的平均值。不对该性能状态下材料的应变限值进行控制。
4)中等破坏状态
PRIESTLEY等[22]指出该状态下混凝土核心区压应变如式(3)所示:
式中:ρvv为核心区体积配箍率;fy为暗柱箍筋屈服强度;εsv,u为箍筋极限拉应变;fcc为核心区约束混凝土峰值应力。
该状态的混凝土变形限值取其压应变为εcu≤ 0.020,纵筋取其拉应变为0.050;考虑到腹板暗柱型钢受拉翼缘对构件受拉承载力的贡献,型钢变形限值取拉应变为0.060。对于发生弯剪破坏(剪切变形主控)、剪切破坏的构件,型钢变形限值取剪应变为0.015。此外,还应严格控制混凝土有效剪切应变,郝霖霏[23]通过ABAQUS分析发生弯曲破坏和剪切破坏的RC剪力墙构件,以混凝土受压损伤划分性能状态变形限值,统计出构件发生中等破坏时对应的混凝土受压损伤为0.8;杨万[24]通过ABAQUS分析发生弯剪破坏的L形RC剪力墙在中等破坏状态下,混凝土受压损伤为0.8时所对应的混凝土剪应变为0.020。对于弯剪破坏(剪切变形主控)构件,在该性能状态下混凝土的变形限值取其剪应变为0.020。
5)比较严重破坏状态
在GB 50011—2010《建筑抗震设计规范》[19]中规定该性能状态下构件变形限值小于0.9倍塑性位移角和0.1倍极限承载力时,需仔细排除倒塌风险并大修。该状态下表观现象为构件发生严重的塑性变形,试件承载力下降到0.85倍峰值承载力;PRIESTLEY等[22]指出该状态下混凝土核心区保护层压应变不超过1.5εcu,同时考虑到型钢翼缘因受拉应变过大而屈服或受压过大发生屈曲,因此将型钢和纵筋的拉应变限值设为0.9倍的极限拉应变,且其应变小于等于0.08。对于发生剪切破坏的构件,型钢的剪应变控制在0.025;戚永乐[18]通过大量有限元模型分析并与试验结果比较发现发生剪切破坏的RC剪力墙达到极限状态时混凝土剪应力为0.015。考虑型钢与混凝土的黏结能力和抗剪钢筋受剪屈服,对于发生剪切破坏的构件,该性能点变形限值取混凝土剪应变达0.015。
6)严重破坏状态
该性能状态下构件基本失去继续承载的能力,受压区混凝土被压溃,部分纵向钢筋、箍筋被拉断,型钢可能受压屈曲或受拉屈服,试件承载力下降到0.7Pmax(峰值承载力)。此时混凝土已无控制变形限值的意义,因此,以其他材料的应变极限作为该状态下的变形限值,纵向钢筋变形限值取其极限拉应变约为0.120,型钢变形限值取其极限拉应变约为0.100,为安全考虑,该状态纵筋、型钢的变形限值取其极限拉压应变为0.100。对于剪切破坏构件应严格控制其变形限值,取型钢限值取其剪应变为0.030。对于弯剪破坏构件混凝土变形限制取其剪应变为0.025[24]
7)失效状态
失效状态表示构件完全失去承载力能力,构件最终破坏。综上所述,得到基于材料应变的构件各性能状态变形限值划分准则如表5所示。
根据3.1节材料应变位移角限值的划分准则,分析主要控制参数对构件各性能点位移角限值的影响。由于T形SRC剪力墙的截面不是双轴对称截面,因此其滞回曲线及骨架是不对称的。且因为采用单调正负向加载的方式,构件的变形限值将有2种取法。结合文献[24-26]对异形截面剪力墙变形限值的取法,为便于下文各设计参数与位移角限值的相关性分析及安全考虑,此处取2种变形限值中的较小值。图8~图12中,基本完好状态的位移角限值对应θ1e,其余性能状态的位移角(θ2~θ6)限值为总的弹塑性位移角减去基本完好状态位移角。图中n为轴压比、λ为剪跨比、ρw为腹板无翼缘端部配钢率、ρs为暗柱配筋率、λv为暗柱配箍特征值。
1)剪跨比
选取剪跨比为1.5、2.0、2.5;轴压比为0.10、0.25、0.45、0.55;腹板暗柱配钢率ρw为4.0%;暗柱箍筋特征值为0.20;暗柱纵筋配筋率ρs为1.33%的试件,分析该参数对构件各性能状态位移角限值的影响,结果如图8所示。由图可知,随剪跨比增大,构件各性能点位移角限值逐渐增大;当轴压比为0.10时,在剪跨比在[2,2.5]区间内,位移角限值θ1e~θ5增长不是很明显;当轴压比为0.45、0.55时,各位移角限值增长幅度较大,原因是高轴压比状态下,随着剪跨比增大构件抵抗变形的能力增加,延性增强,构件破坏形态逐渐转为弯曲主控型。
2)轴压比
选取剪跨比为1.5、2.0、2.5;轴压比为0.10、0.25、0.45、0.55;腹板暗柱配钢率ρw为4.0%;暗柱箍筋特征值为0.20;暗柱纵筋配筋率ρs为1.33%的试件,分析该参数对构件各性能状态位移角限值的影响,如图9所示。由图9可知,剪跨比不变时,随轴压比增大各状态下位移角限值逐渐减小,其中θ1eθ2基本不变;当剪跨比为2.0、2.5,轴压比为0.10、0.25时,位移角限值θ6基本不变;轴压比从0.25增至0.55时,位移角限值θ6下降幅度较大,原因是随着轴压比的增大,轴压力水平变大,构件将更快达到峰值荷载。
3)腹板暗柱配钢率
选取剪跨比为1.5、2.5;轴压比为0.10、0.55;腹板暗柱配钢率ρw为4.0%、5.5%、7.6%;暗柱箍筋特征值为0.20;暗柱纵筋配筋率ρs为1.33%的试件,分析该参数对构件各性能状态位移角限值的影响,如图10所示。由图10可知,对于剪跨比和轴压比均较小或均较大的构件如图10(a)、(d),随腹板配钢率的增大,位移角限值θ3~θ6均减小,而θ1e~θ2基本不变,原因是腹板配钢率的增加使构件刚度增大,但腹板水平钢筋、箍筋抗剪能力有限,构件抵抗剪切变形的能力小于抵抗弯曲变形的能力,构件破坏因此逐渐转向剪切主控型,易发生剪切破坏和剪切变形主控的弯剪破坏;对于高剪跨比和低轴压比的构件(图10(c)),随腹板配钢率增大,位移角限值均有所提高,但增长幅度不大;对于低剪跨比和高轴压比的构件(图10(b)),随着腹板配钢率的增大,位移角限值θ1eθ2θ6均增大,但增长幅度不大,而位移角限值θ3~θ5均减小,这是由于配钢率增大,构件承载力上限增高,承载力上升加快且下降放缓导致的。
4)暗柱纵筋配筋率
选取剪跨比为1.5、2.5,轴压比为0.10、0.55,腹板暗柱配钢率ρw为4.0%,暗柱箍筋特征值为0.20,暗柱纵筋配筋率为1.33%、2.08%、3.25%的试件,分析该参数对构件各性能状态位移角限值的影响,如图11所示。由图11可知,对于剪跨比和轴压比均较小或均较大的构件(图11(a)、(d)),随暗柱配筋率增大,各位移角限值均减小;对于低剪跨比和高轴压比、高剪跨比和低轴压比的构件(图11(b)、(c)),随着暗柱配筋率的增大,各位移角限值均增大,但是增长幅度不大,可见暗柱配筋率对该类构件的位移角限值影响不大。
5)暗柱箍筋特征值
选取剪跨比为1.5、2.5;轴压比为0.10、0.55;腹板暗柱配钢率ρw为4.0%;暗柱箍筋特征值为0.12、0.20、0.27;暗柱纵筋配筋率ρs为1.33%的试件,分析该参数对构件各性能状态位移角限值的影响,如图12所示。由图12可知,随暗柱箍筋特征值的增大,位移角限值均增大,且对于低剪跨比、高轴压比的构件,通过减小箍筋间距,有效约束暗柱混凝土,能较大程度地提高构件延性,减缓其承载力的下降,进而提高构件的位移角限值。
为更直观地判断某个参数对构件位移角限值的影响程度,引入统计学方法分析各参数与位移角限值的关联程度,并拟合出各性能状态变形限值计算式。为保证回归分析有意义,采用逐步线性回归和T检验方法,剔除显著性大于0.05的自变量。其中相关系数(R)反映因变量与自变量之间的密切程度,R>0说明2个变量存在线性正相关,R<0说明2个变量存在线性负相关,其范围为-1~1。显著性(Sig)小于0.05,说明回归系数具有显著意义。以剪跨比(λ)、轴压比(n)、腹板配钢率(ρw)、暗柱箍筋特征值(λv)和暗柱纵筋配筋率(ρs)为自变量,以位移角限值为因变量进行回归分析。不同破坏模式下各性能状态位移角限值计算公式和相关系数如表6所示。
表6可知,不同性能状态下各破坏形态相关系数均大于0.50,显著性大于0.05的自变量均已剔除,其余显著性小于0.05的自变量满足回归模型要求。为验证回归公式的可靠性,对比有限元模拟结果和拟合公式计算结果如图13所示。图中红色实线表示线性拟合直线,虚线所围区域表示85%预测带,θc表示有限元结果位移角限值,θs表示拟合公式计算值。
图13可知,3种破坏模式下各性能状态相关系数R的平均值为0.97,变异系数Cv的平均值为0.12,位移角比值基本分布在85%的置信区间内,说明3种破坏模式下各性能状态位移角限值拟合公式的计算值与有限元结果拟合较好,线性回归公式能较好预测剪切、弯剪和弯曲破坏下各性能状态位移角限值。
由于按表6位移角限值拟合式计算的计算值存在一定离散性。仅通过分布拟合取各性能状态变形限值的均值不可靠,为保证拟合公式计算出的变形限值有一定安全储备,引入失效概率,即试件变形限值试验值与拟合公式计算值的比值小于1的概率,以此评价拟合公式和变形限值取值的适用性及合理性。
结合ASCE 41[27]规范,水平荷载下降至0.8倍的水平峰值荷载所对应的构件塑性位移角(对应文中比较严重破坏状态)失效概率应控制在35%以内,构件轴向承载力失效时对应的塑性位移角(对应文中严重破坏状态)失效概率应控制在15%以内,因此取基本完好、轻微损坏、轻中等破坏、中等破坏性能状态位移角限值θ1e~θ4的失效概率为35%,取比较严重破坏、严重破坏状态的位移角限值θ5θ6的失效概率为20%、15%。若各性能状态位移角限值拟合公式计算值不满足失效概率要求,则需通过可靠系数对拟合公式计算结果进行调整。以构件发生弯曲破坏状态为例,各性能点变形限值拟合式计算值与有限元模拟值比值的失效概率如图14所示。
图14可知,弯曲破坏下仅轻中等破坏(14.2%)、中等破坏状态(21.2%)满足失效概率为35%要求,基本完好(64.7%)、轻微损坏(65.9%)、比较严重破坏(25.9%)及严重破坏(49.4%)的性能状态均不满足失效概率要求,因此对不满足失效概率的性能状态需通过可靠系数进行调整。将基本完好位移角限值调为0.98θ1e,c,轻微损坏位移角限值调为0.95θ2,c,比较严重破坏位移角限值调为0.8θ5,c,严重破坏状态位移角限值调为0.8θ6,c,得到基本完好(29.9%)、轻微损坏(23.6%)、比较严重破坏(19.1%)及严重破坏(13.4%)的各性能状态修正后的失效概率。同理,对剪切破坏、弯剪破坏下不满足失效概率要求的拟合公式进行调整,得到3种破坏状态下修正后的各性能状态失效概率如表7所示。由表可知,通过对上述3种破坏形态下各性能状态拟合公式计算值进行合理修正,各性能状态位移角限值拟合公式计算值与有限元模拟值的比值能基本满足要求。
根据3.4节位移角限值拟合式和失效概率调整的各性能状态下位移角限值修正值,建立剪切、弯剪和弯曲破坏下各性能状态变形限值表,如表8所示。
表8各性能状态、变形限值取值说明,若按表6各性能状态位移角限值公式计算的结果若大于表8中的变形限值,则取表8中的变形限值或乘以相应的可靠系数。为确保比较严重破坏、严重破坏下位移角限值计算值大于实际试验值的概率减小,以确保满足工程实际需要,因此令发生弯曲破坏时比较严重破坏状态、严重破坏状态下的变形限值相差较小。
为验证上述各性能状态拟合式和变形限值取值的可靠性,将试件各性能点变形限值试验值与拟合式计算值进行对比,选用文献[15-1628-29]中含有剪切、弯剪、弯曲破坏的试件SRC-T5/6、TW4、SRCTW1、SRCTW-1/2/3等共7个试件,设计参数见表1表9。其中轴压比试验值按式(1)换算。位移角限值按表7拟合式计算,若拟合式计算值大于表8中数值,则按表8中数值取值。考虑到收集的部分试件缺少承载力下降至0.5倍峰值承载力时的位移试件样本,因此以位移角限值θ1e~θ5拟合式计算值与试验值的比值进行验证,结果如表10图15所示,表中θ1e,s~θ5,s为拟合式计算值,θ1e,t~θ5,t为试验值。
表10图15可知,位移角限值拟合式计算值与试验值比值均小于1,方差均小于0.010,标准差均小于0.1。虽然收集到的试件截面、配钢形式和加载条件等不同,导致部分试件位移角限值拟合式计算值与试验值的比值较大,但均小于1。大部分试件位移角限值拟合式计算值试验值比值均小于0.8,说明拟合出的T形截面SRC剪力墙位移角限值计算式和变形限值表较为合理且有一定的安全储备。
根据以上对T形截面SRC剪力墙基于性能的变形限值研究分析,得到如下结论:
1)通过对T形截面SRC剪力墙破坏形态分析,发现构件发生弯曲破坏准确率为85.9%、发生弯剪破坏准确率为90.6%、发生剪切破坏准确率为94.5%,T形截面SRC剪力墙破坏形态判别准则预测正确率均大于85%,满足实际工程需要。
2)本文以塑性位移角作为构件各性能点量化指标,基于材料应变和承载力、试验现象确定各性能点变形限值。分析各参数变化对构件荷载位移曲线、各性能状态变形限值的影响;发现剪跨比、轴压比和暗柱腹板配钢率对构件骨架曲线的影响较大;剪跨比、轴压比对构件各性能状态位移角限值影响较为显著,暗柱腹板配钢率、纵筋配筋率及箍筋特征值对构件位移角限值影响相对较小。
3)通过对T形截面SRC剪力墙基于性能的变形限值研究,构件发生剪切、弯剪和弯曲破坏模式下各性能状态拟合公式位移角限值计算值与有限元结果拟合较好。通过试验验证修正后的位移角限值取值方法的可靠性,所取试件位移角限值θ1e~θ5均值均小于1,标准差均小于0.01。大部分试件位移角限值计算值与试验值比值均小于0.8,说明修正后的位移角限值取值较为合理且有一定的安全储备。
  • 国家自然科学基金项目(51668007)
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2024年第44卷第4期
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doi: 10.13197/j.eeed.2024.0409
  • 接收时间:2023-06-27
  • 首发时间:2026-03-30
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  • 收稿日期:2023-06-27
  • 修回日期:2023-10-08
基金
国家自然科学基金项目(51668007)
作者信息
    1.广西大学 土木建筑工程学院,广西 南宁 530000
    2.广西建工第五建筑工程集团有限公司,广西 南宁 530000

通讯作者:

林有超(1982—),男,高级工程师,硕士,主要从事结构工程的设计和研究。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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