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Aiming at the problems of random failure position, large amount of steel cutting and excessive welding length of traditional cross-core concrete-filled steel tube buckling-restrained brace ( CSBRB), a new type of perforated cross-core concrete-filled steel tube buckling-restrained brace (PCSBRB) is proposed in this paper. The structure and characteristics of PCSBRB are introduced, and the calculation equation of basic mechanical parameters is given. Six groups of PCSBRB models with different opening parameters and one group of CSBRB models are designed, and the quasi-static finite element analysis is carried out by ABAQUS software. The effects of the structural rationality of PCSBRB, the opening ratio and the number of openings on the mechanical properties, energy dissipation performance, stress distribution, high-order deformation characteristics, in-plane instability of the opening section and the equivalent cumulative plastic strain of PCSBRB are studied. The analysis results show that the structure of PCSBRB is reasonable, and the bearing capacity and energy dissipation performance are similar to those of CSBRB. The yield area of PCSBRB is located in the opening section, which has the advantages of fixed-point yield and multi-point energy dissipation. The hysteresis curves of PCSBRB with reasonable design is stable, full and symmetrical. For PSCBRB with too small opening rate, the stress is concentrated at the limit hole, and the purpose of fixed-point yielding cannot be achieved. For PCSBRB with too large opening rate, the opening section is prone to in-plane instability, resulting in a decrease in the bearing capacity of PCSBRB. The opening rate of PCSBRB should be 33%~50%. When the total length of the opening section is 1500 mm, the number of openings is set to 4~8, and the performance is similar. Compared with CSBRB, PCSBRB has higher material utilization and lower welding cost.
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针对传统十字芯钢管混凝土防屈曲耗能支撑(cross-core concrete-filled steel tube buckling-restrained brace,CSBRB)破坏位置随机、钢材切割量大以及焊接长度过大的问题。该文提出一种新型开孔十字芯钢管混凝土防屈曲耗能支撑(perforated cross-core concrete-filled steel tube buckling-restrained brace,PCSBRB)。介绍了PCSBRB的构造方式及特点、给出基本力学参数的计算公式。设计6组不同开孔参数的PCSBRB及1组CSBRB模型,采用ABAQUS软件对其进行拟静力有限元分析,研究PCSBRB的构造合理性、开孔率和开孔个数对PCSBRB力学性能、耗能性能、应力分布、高阶变形特征、开孔段面内失稳现象以及等效累积塑性应变的影响规律。研究结果表明:PCSBRB构造合理,承载能力、耗能性能与CSBRB相近,PCSBRB屈服区域均位于开孔段,具有定点屈服、多点同时耗能的优势;设计合理的PCSBRB滞回曲线稳定、饱满,对称性好;开孔率过小的PSCBRB,应力集中在限位孔处,无法达到“定点屈服”的目的,开孔率过大的PCSBRB,开孔段易发生面内失稳,导致PCSBRB的承载力下降,PCSBRB的开孔率宜取33%~50%;当开孔段总长为1500 mm时,开孔数量设置为4~8性能相近;相比CSBRB,PCSBRB材料利用率更高,焊接成本显著减少。
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庄紫绚(2000—),女,硕士研究生,主要从事结构隔震与消能减震控制方面的研究。E-mail:2112216015@e.gzhu.edu.cn
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Construction of PCSBRB and CSBRB, figureFileSmall=6LytiCVt0IkgOpOv7cwkHg==, figureFileBig=Barfw0RaAWAMNKRjdS5wIA==, tableContent=null), ArticleFig(id=1241802909227221130, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图1, caption=
PCSBRB与CSBRB的构造, figureFileSmall=6LytiCVt0IkgOpOv7cwkHg==, figureFileBig=Barfw0RaAWAMNKRjdS5wIA==, tableContent=null), ArticleFig(id=1241802909390799011, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 2, caption=
Schematic diagram of PCSBRB calculation, figureFileSmall=3Mw6TdB0GKqvtzTn4cbk8A==, figureFileBig=wc2xsTt4JiPvRvaft9f+ZQ==, tableContent=null), ArticleFig(id=1241802909558571191, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图2, caption=
PCSBRB计算示意图, figureFileSmall=3Mw6TdB0GKqvtzTn4cbk8A==, figureFileBig=wc2xsTt4JiPvRvaft9f+ZQ==, tableContent=null), ArticleFig(id=1241802909688594631, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 3, caption=
Mesh subdivision of PCSBRB, figureFileSmall=GydCpHstVzxptH3zUsUptg==, figureFileBig=smMPJZQA5Hk8sWYaBTJZfA==, tableContent=null), ArticleFig(id=1241802909797646545, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图3, caption=
PCSBRB网格划分, figureFileSmall=GydCpHstVzxptH3zUsUptg==, figureFileBig=smMPJZQA5Hk8sWYaBTJZfA==, tableContent=null), ArticleFig(id=1241802909915087073, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 4, caption=
End coupling, figureFileSmall=3QCmXccmsSI8lcIZ9xOksw==, figureFileBig=vzSdwarZPn+5fhzvNK2eMA==, tableContent=null), ArticleFig(id=1241802910074470635, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图4, caption=
端部耦合, figureFileSmall=3QCmXccmsSI8lcIZ9xOksw==, figureFileBig=vzSdwarZPn+5fhzvNK2eMA==, tableContent=null), ArticleFig(id=1241802910200299768, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 5, caption=
Hysteresis curves of test and simulation, figureFileSmall=mdGeTeHmAwJM3E0+s2LSAA==, figureFileBig=Wq6hwH2R4NNw6TgJrF7EsQ==, tableContent=null), ArticleFig(id=1241802910284185863, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图5, caption=
试验与模拟滞回曲线, figureFileSmall=mdGeTeHmAwJM3E0+s2LSAA==, figureFileBig=Wq6hwH2R4NNw6TgJrF7EsQ==, tableContent=null), ArticleFig(id=1241802910414209298, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 6, caption=
Hysteresis curves, figureFileSmall=wJgIe65CvFV1+/4LLi/5pA==, figureFileBig=6/7zExUlvGC3nneNSzxK6w==, tableContent=null), ArticleFig(id=1241802910540038431, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图6, caption=
滞回曲线, figureFileSmall=wJgIe65CvFV1+/4LLi/5pA==, figureFileBig=6/7zExUlvGC3nneNSzxK6w==, tableContent=null), ArticleFig(id=1241802910661673261, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 7, caption=
Skeleton curves, figureFileSmall=ZM7rdpbs999zwftX804nRA==, figureFileBig=oz6KTCti08R0ydzy0NAJuQ==, tableContent=null), ArticleFig(id=1241802910783308091, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图7, caption=
骨架曲线, figureFileSmall=ZM7rdpbs999zwftX804nRA==, figureFileBig=oz6KTCti08R0ydzy0NAJuQ==, tableContent=null), ArticleFig(id=1241802910938497355, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 8, caption=
Equivalent viscous damping coefficients, figureFileSmall=wXffgYvhXZNo1V0t1fOpOQ==, figureFileBig=wKZ81D/3IVGSt5gDyv8zkQ==, tableContent=null), ArticleFig(id=1241802911047549274, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图8, caption=
等效黏滞阻尼系数, figureFileSmall=wXffgYvhXZNo1V0t1fOpOQ==, figureFileBig=wKZ81D/3IVGSt5gDyv8zkQ==, tableContent=null), ArticleFig(id=1241802912632996202, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 9, caption=
Stress distribution, figureFileSmall=iS7jJoMfUGwC5ioJRiM8dw==, figureFileBig=Y8MuGelUhHq3iRVz9zhNLg==, tableContent=null), ArticleFig(id=1241802912800768378, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图9, caption=
应力分布, figureFileSmall=iS7jJoMfUGwC5ioJRiM8dw==, figureFileBig=Y8MuGelUhHq3iRVz9zhNLg==, tableContent=null), ArticleFig(id=1241802912968540555, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 10, caption=
High-order deformation characteristics, figureFileSmall=/F2wROn1+O2l70A8K7VzuQ==, figureFileBig=rBf7YJMLhRsK/F41vKFwfg==, tableContent=null), ArticleFig(id=1241802913165672859, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图10, caption=
高阶变形特征, figureFileSmall=/F2wROn1+O2l70A8K7VzuQ==, figureFileBig=rBf7YJMLhRsK/F41vKFwfg==, tableContent=null), ArticleFig(id=1241802913287307691, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 11, caption=
Development process of in-plane buckling instability of core unit, figureFileSmall=cBeAmcqe61YczBFpBI6CQA==, figureFileBig=V9mnsf0SfsEt+t/FlsXjxw==, tableContent=null), ArticleFig(id=1241802913429914044, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图11, caption=
核心单元面内屈曲失稳发展过程, figureFileSmall=cBeAmcqe61YczBFpBI6CQA==, figureFileBig=V9mnsf0SfsEt+t/FlsXjxw==, tableContent=null), ArticleFig(id=1241802913622852042, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Fig. 12, caption=
Equivalent cumulative plastic strain(PEEQ), figureFileSmall=NLumDqJMgFd1CE621ypbSQ==, figureFileBig=8+e0nZr5I4okHGCcUuGtPg==, tableContent=null), ArticleFig(id=1241802913731903955, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=图12, caption=
等效累积塑性应变(PEEQ), figureFileSmall=NLumDqJMgFd1CE621ypbSQ==, figureFileBig=8+e0nZr5I4okHGCcUuGtPg==, tableContent=null), ArticleFig(id=1241802913840955873, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 1, caption=
Specific parameters of PCSBRB
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件编号 | 开孔数n | 开孔率/% | 开孔段 | 非开孔段 |
|---|
| ΣLy/mm | Ay/mm2 | ΣLt1/mm | ΣLt2/mm | ΣLt3/mm | At/mm2 |
|---|
| PCSBRB1 | 4 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB2 | 6 | 20 | 1500 | 1920 | 400 | 200 | 100 | 2336 |
| PCSBRB3 | 6 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB4 | 6 | 50 | 1500 | 1200 | 400 | 200 | 100 | 2336 |
| PCSBRB5 | 8 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB6 | 6 | 70 | 1500 | 720 | 400 | 200 | 100 | 2336 |
), ArticleFig(id=1241802913983562222, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表1, caption=
PCSBRB具体参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件编号 | 开孔数n | 开孔率/% | 开孔段 | 非开孔段 |
|---|
| ΣLy/mm | Ay/mm2 | ΣLt1/mm | ΣLt2/mm | ΣLt3/mm | At/mm2 |
|---|
| PCSBRB1 | 4 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB2 | 6 | 20 | 1500 | 1920 | 400 | 200 | 100 | 2336 |
| PCSBRB3 | 6 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB4 | 6 | 50 | 1500 | 1200 | 400 | 200 | 100 | 2336 |
| PCSBRB5 | 8 | 33 | 1500 | 1600 | 400 | 200 | 100 | 2336 |
| PCSBRB6 | 6 | 70 | 1500 | 720 | 400 | 200 | 100 | 2336 |
), ArticleFig(id=1241802914155528700, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 2, caption=
Specific parameters of CSBRB
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件编号 | 屈服段 | 连接段 | 过渡段 | 限位卡口 |
|---|
| ΣLy/mm | Ay/mm2 | ΣLt1/mm | At1/mm2 | ΣLt2/mm | At2/mm2 | ΣLt3/mm | At3/mm2 |
|---|
| CSBRB | 1500 | 1600 | 360 | 2336 | 280 | 1944.84 | 60 | 2240 |
), ArticleFig(id=1241802914268774917, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表2, caption=
CSBRB具体参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件编号 | 屈服段 | 连接段 | 过渡段 | 限位卡口 |
|---|
| ΣLy/mm | Ay/mm2 | ΣLt1/mm | At1/mm2 | ΣLt2/mm | At2/mm2 | ΣLt3/mm | At3/mm2 |
|---|
| CSBRB | 1500 | 1600 | 360 | 2336 | 280 | 1944.84 | 60 | 2240 |
), ArticleFig(id=1241802914382021141, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 3, caption=
Mechanical parameters of BRBs
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件 | 初始刚度/(kN/mm) | 屈服力/kN | 屈服位移/mm | 试件 | 初始刚度/(kN/mm) | 屈服力/kN | 屈服位移/mm |
|---|
| CSBRB | 163.19 | 456.0 | 2.79 | PCSBRB4 | 132.93 | 342.0 | 2.57 |
| PCSBRB1 | 166.51 | 456.0 | 2.74 | PCSBRB5 | 166.51 | 456.0 | 2.74 |
| PCSBRB2 | 190.58 | 547.2 | 2.87 | PCSBRB6 | 86.45 | 205.2 | 2.37 |
| PCSBRB3 | 166.51 | 456.0 | 2.74 | | | | |
), ArticleFig(id=1241802914482684449, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表3, caption=
防屈曲耗能支撑力学参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件 | 初始刚度/(kN/mm) | 屈服力/kN | 屈服位移/mm | 试件 | 初始刚度/(kN/mm) | 屈服力/kN | 屈服位移/mm |
|---|
| CSBRB | 163.19 | 456.0 | 2.79 | PCSBRB4 | 132.93 | 342.0 | 2.57 |
| PCSBRB1 | 166.51 | 456.0 | 2.74 | PCSBRB5 | 166.51 | 456.0 | 2.74 |
| PCSBRB2 | 190.58 | 547.2 | 2.87 | PCSBRB6 | 86.45 | 205.2 | 2.37 |
| PCSBRB3 | 166.51 | 456.0 | 2.74 | | | | |
), ArticleFig(id=1241802914574959151, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 4, caption=
Parameters of steel constitutive model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 型号 | σ0/MPa | C1 | γ1 | C2 | γ2 | C3 | γ3 | Es/GPa | v |
|---|
| Q235 | 250 | 10000 | 100 | 12000 | 320 | 4000 | 1000 | 206 | 0.3 |
), ArticleFig(id=1241802914675622458, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表4, caption=
钢材本构模型参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 型号 | σ0/MPa | C1 | γ1 | C2 | γ2 | C3 | γ3 | Es/GPa | v |
|---|
| Q235 | 250 | 10000 | 100 | 12000 | 320 | 4000 | 1000 | 206 | 0.3 |
), ArticleFig(id=1241802914830811721, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 5, caption=
Mechanical parameters of BRBs by finite element simulation
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件 | 屈服力/kN | 初始刚度/(kN/mm) | 屈服位移/mm | 屈服后刚度/(kN/mm) | 受拉极限荷载/kN | 受压极限荷载/kN | 拉压不均匀系数β |
|---|
| CSBRB1 | 453.43(-0.56%) | 162.15(-0.64%) | 2.796(0.22%) | 12.43 | 695.81 | -746.92 | 1.07 |
| PCSBRB1 | 452.69(-0.73%) | 161.56(-2.97%) | 2.802(2.26%) | 13.99 | 693.94 | -785.92 | 1.13 |
| PCSBRB2 | 529.11(-3.31%) | 187.56(-1.58%) | 2.821(-1.71%) | 16.09 | 822.72 | -921.29 | 1.12 |
| PCSBRB3 | 450.16(-1.28%) | 160.60(-3.55%) | 2.803(2.30%) | 14.96 | 693.18 | -788.38 | 1.14 |
| PCSBRB4 | 318.50(-6.87%) | 125.00(-5.97%) | 2.548(-0.86%) | 10.85 | 498.99 | -597.50 | 1.20 |
| PCSBRB5 | 451.29(-1.03%) | 160.60(-3.55%) | 2.810(2.55%) | 14.68 | 691.58 | -801.60 | 1.16 |
| PCSBRB6 | 197.91(-3.55%) | 82.53(-4.53%) | 2.398(1.18%) | 4.87 | 293.12 | -326.19 | 1.11 |
), ArticleFig(id=1241802914977612378, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表5, caption=
有限元模拟得出的防屈曲耗能支撑力学参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试件 | 屈服力/kN | 初始刚度/(kN/mm) | 屈服位移/mm | 屈服后刚度/(kN/mm) | 受拉极限荷载/kN | 受压极限荷载/kN | 拉压不均匀系数β |
|---|
| CSBRB1 | 453.43(-0.56%) | 162.15(-0.64%) | 2.796(0.22%) | 12.43 | 695.81 | -746.92 | 1.07 |
| PCSBRB1 | 452.69(-0.73%) | 161.56(-2.97%) | 2.802(2.26%) | 13.99 | 693.94 | -785.92 | 1.13 |
| PCSBRB2 | 529.11(-3.31%) | 187.56(-1.58%) | 2.821(-1.71%) | 16.09 | 822.72 | -921.29 | 1.12 |
| PCSBRB3 | 450.16(-1.28%) | 160.60(-3.55%) | 2.803(2.30%) | 14.96 | 693.18 | -788.38 | 1.14 |
| PCSBRB4 | 318.50(-6.87%) | 125.00(-5.97%) | 2.548(-0.86%) | 10.85 | 498.99 | -597.50 | 1.20 |
| PCSBRB5 | 451.29(-1.03%) | 160.60(-3.55%) | 2.810(2.55%) | 14.68 | 691.58 | -801.60 | 1.16 |
| PCSBRB6 | 197.91(-3.55%) | 82.53(-4.53%) | 2.398(1.18%) | 4.87 | 293.12 | -326.19 | 1.11 |
), ArticleFig(id=1241802915103441511, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 6, caption=
PCSBRB critical load and compressive capacity under compression amplitude of 30 mm
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型名称(开孔率) | 临界荷载Fcr/kN | 受压承载力/kN | 模型名称(开孔率) | 临界荷载Fcr/kN | 受压承载力/kN |
|---|
| PCSBRB1(33%) | 825.65 | 785.92 | PCSBRB4(50%) | 779.89 | 597.50 |
| PCSBRB2(20%) | 1277.76 | 921.29 | PCSBRB5(33%) | 1651.30 | 801.60 |
| PCSBRB3(33%) | 1238.48 | 788.38 | PCSBRB6(70%) | 235.84 | 326.19 |
), ArticleFig(id=1241802915229270643, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表6, caption=
压缩幅值30 mm下PCSBRB临界荷载Fcr与受压承载力
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型名称(开孔率) | 临界荷载Fcr/kN | 受压承载力/kN | 模型名称(开孔率) | 临界荷载Fcr/kN | 受压承载力/kN |
|---|
| PCSBRB1(33%) | 825.65 | 785.92 | PCSBRB4(50%) | 779.89 | 597.50 |
| PCSBRB2(20%) | 1277.76 | 921.29 | PCSBRB5(33%) | 1651.30 | 801.60 |
| PCSBRB3(33%) | 1238.48 | 788.38 | PCSBRB6(70%) | 235.84 | 326.19 |
), ArticleFig(id=1241802915468345991, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=EN, label=Table 7, caption=
Comparison of material and welding quantity of the core between CSBRB and PCSBRB3
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| 试件 | 总量/cm3 | 损耗量/cm3 | 材料利用率/% | 焊接长度/mm |
|---|
| CSBRB | 5280 | 1312.0 | 75.15 | 2200 |
| PCSBRB3 | 5280 | 1148.4 | 78.25 | 900 |
), ArticleFig(id=1241802915610952342, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241791793218523140, language=CN, label=表7, caption=
CSBRB与PCSBRB3材料与焊接对比
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| 试件 | 总量/cm3 | 损耗量/cm3 | 材料利用率/% | 焊接长度/mm |
|---|
| CSBRB | 5280 | 1312.0 | 75.15 | 2200 |
| PCSBRB3 | 5280 | 1148.4 | 78.25 | 900 |
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