Article(id=1244340205415674206, tenantId=1146029695717560320, journalId=1244295746212642849, issueId=1244340201636610993, articleNumber=null, orderNo=null, doi=10.11776/j.issn.1000-4939.2025.06.013, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1709568000000, receivedDateStr=2024-03-05, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1774603423694, onlineDateStr=2026-03-27, pubDate=1765728000000, pubDateStr=2025-12-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774603423694, onlineIssueDateStr=2026-03-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774603423694, creator=13701087609, updateTime=1774603423694, updator=13701087609, issue=Issue{id=1244340201636610993, tenantId=1146029695717560320, journalId=1244295746212642849, year='2025', volume='42', issue='6', pageStart='1207', pageEnd='1446', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1774603422792, creator=13701087609, updateTime=1774603751062, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1244341578555306992, tenantId=1146029695717560320, journalId=1244295746212642849, issueId=1244340201636610993, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1244341578555306993, tenantId=1146029695717560320, journalId=1244295746212642849, issueId=1244340201636610993, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1330, endPage=1339, ext={EN=ArticleExt(id=1244340205730247010, articleId=1244340205415674206, tenantId=1146029695717560320, journalId=1244295746212642849, language=EN, title=Creep analysis method for reinforced concrete fiber beam elements considering shear effect, columnId=1244340205327593820, journalTitle=Chinese Journal of Applied Mechanics, columnName=Solid Mechanics, runingTitle=null, highlight=null, articleAbstract=
The classic fiber model based on Euler-Bernoulli beam theory overlooks the influence of shear deformation on the section of the beam. In order to establish a more accurate creep analysis method for reinforced concrete fiber beam elements, this paper proposes a fiber beam element considering shear effects based on Timoshenko beam theory. The stiffness matrix of the fiber beam element is derived, and the finite element equation for the equivalent nodal force of creep analysis based on concrete creep analysis initial strain method is obtained. Finally, a finite element method for creep analysis of reinforced concrete fiber beam elements is established. A computing program is developed in FORTRAN language, and elastic analysis for normal beam and reinforced concrete beam, and creep analysis for reinforced concrete beam are conducted. The results are compared with analytical solutions, commercial software and other literature, indicating that the proposed method can accurately consider the shear effects and clearly define the behaviors of steel and concrete in the creep performance of reinforced concrete beams. Moreover, including steel in the creep analysis model can effectively improve the accuracy of the results.
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基于Euler-Bernoulli梁理论的经典纤维模型忽略了剪切变形给截面带来的影响,为了建立更加精确的钢筋混凝土纤维梁单元徐变分析方法,基于考虑剪切效应的纤维梁单元,根据Timoshenko梁理论,推导了该纤维梁单元的刚度矩阵,利用混凝土徐变分析的初应变法,导出单元徐变等效节点力的有限元列式,最终建立了钢筋混凝土纤维梁单元徐变分析的有限元方法。利用FORTRAN语言编制了计算程序,进行了普通梁与钢筋混凝土梁的弹性分析,以及钢筋混凝土梁的徐变分析,分别与解析解、ABAQUS有限元解以及其他文献解进行了比较。结果表明:该方法在准确计入剪切效应的同时,能清晰界定钢筋与混凝土在钢筋混凝土梁徐变性能中的行为;同时也表明钢筋混凝土梁徐变分析模型中计入钢筋能有效提高计算结果的精度。
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1.长沙理工大学土木与环境工程学院,410114 长沙
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2.长沙理工大学桥梁工程安全控制教育部重点实验室,410114 长沙)])], figs=[ArticleFig(id=1244340232687038681, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.1, caption=
Reinforced concrete fiber beam element, figureFileSmall=wtRZV8yieAfLF0sp+OpWpg==, figureFileBig=bI5eT5F9EWf7L7LtW02ECg==, tableContent=null), ArticleFig(id=1244340232817062114, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图1, caption=
钢筋混凝土纤维梁单元, figureFileSmall=wtRZV8yieAfLF0sp+OpWpg==, figureFileBig=bI5eT5F9EWf7L7LtW02ECg==, tableContent=null), ArticleFig(id=1244340233077108975, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.2, caption=
Simply supported beams subjected to different loads, figureFileSmall=4HWM/iHNwBG/iDr87pEm4Q==, figureFileBig=kbjw7ddtira/P6H4FBxSHg==, tableContent=null), ArticleFig(id=1244340234591252728, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图2, caption=
承受不同荷载的简支梁, figureFileSmall=4HWM/iHNwBG/iDr87pEm4Q==, figureFileBig=kbjw7ddtira/P6H4FBxSHg==, tableContent=null), ArticleFig(id=1244340234708693248, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.3, caption=
Reinforced concrete cantilever beam, figureFileSmall=0nf/LC+JXwusc5NJCPHCdA==, figureFileBig=i6TW//bQF0/QWPtajfpLDw==, tableContent=null), ArticleFig(id=1244340234859688206, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图3, caption=
钢筋混凝土悬臂梁, figureFileSmall=0nf/LC+JXwusc5NJCPHCdA==, figureFileBig=i6TW//bQF0/QWPtajfpLDw==, tableContent=null), ArticleFig(id=1244340235002294554, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.4, caption=
Deformation diagram before and after ABAQUS loading, figureFileSmall=/fckSHnIu9p3sc8Ve7q9NQ==, figureFileBig=x4OoxCn4mBMi0SukSClQgg==, tableContent=null), ArticleFig(id=1244340235119735076, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图4, caption=
ABAQUS加载前后变形图, figureFileSmall=/fckSHnIu9p3sc8Ve7q9NQ==, figureFileBig=x4OoxCn4mBMi0SukSClQgg==, tableContent=null), ArticleFig(id=1244340235228786992, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.5, caption=
Load displacement diagram of cantilever beam, figureFileSmall=CA246v6wkX4t97cxqmypJQ==, figureFileBig=yyS2V/hCXWPD2XIUwsr5UA==, tableContent=null), ArticleFig(id=1244340235367199031, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图5, caption=
悬臂梁荷载位移图, figureFileSmall=CA246v6wkX4t97cxqmypJQ==, figureFileBig=yyS2V/hCXWPD2XIUwsr5UA==, tableContent=null), ArticleFig(id=1244340235497222461, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.6, caption=
Reinforced concrete beam with simple support under uniform load, figureFileSmall=TpeOsvznEyyjgK50gaaKJA==, figureFileBig=uO+yfidZcLUf3184FHx0LA==, tableContent=null), ArticleFig(id=1244340235597885765, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图6, caption=
承受均布荷载的钢筋混凝土简支梁, figureFileSmall=TpeOsvznEyyjgK50gaaKJA==, figureFileBig=uO+yfidZcLUf3184FHx0LA==, tableContent=null), ArticleFig(id=1244340235694354765, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.7, caption=
Deflection variation of simple support beam, figureFileSmall=WoPaTapyN4yXF/E1y+xTog==, figureFileBig=KO+QSo8L2Zi1ZMwb6uKMsw==, tableContent=null), ArticleFig(id=1244340235845349719, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图7, caption=
简支梁挠度变化图, figureFileSmall=WoPaTapyN4yXF/E1y+xTog==, figureFileBig=KO+QSo8L2Zi1ZMwb6uKMsw==, tableContent=null), ArticleFig(id=1244340235954401633, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.8, caption=
Stress variation along the height of middle section, figureFileSmall=88YAVaqwnP/rd8gnVZDSmg==, figureFileBig=d/offTODGA2P4Eb2eBF3NQ==, tableContent=null), ArticleFig(id=1244340236067647847, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图8, caption=
混凝土应力在跨中截面沿梁高变化图, figureFileSmall=88YAVaqwnP/rd8gnVZDSmg==, figureFileBig=d/offTODGA2P4Eb2eBF3NQ==, tableContent=null), ArticleFig(id=1244340236185088366, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.9, caption=
Variation of axial force in steel along the beam, figureFileSmall=on+iZQTIkWlUDnT3wFoBRg==, figureFileBig=zXkk7syJOKQ2MkxYCiLhlg==, tableContent=null), ArticleFig(id=1244340236306723193, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图9, caption=
钢筋拉力沿梁长变化图, figureFileSmall=on+iZQTIkWlUDnT3wFoBRg==, figureFileBig=zXkk7syJOKQ2MkxYCiLhlg==, tableContent=null), ArticleFig(id=1244340236440940930, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Fig.10, caption=
Effect of reinforcement on beam deflection, figureFileSmall=+zZfqtesvQr/ncX+MLSbig==, figureFileBig=2gWMSO+peWqb5OE3V0K1lA==, tableContent=null), ArticleFig(id=1244340236570964361, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=图10, caption=
钢筋对梁挠度影响图, figureFileSmall=+zZfqtesvQr/ncX+MLSbig==, figureFileBig=2gWMSO+peWqb5OE3V0K1lA==, tableContent=null), ArticleFig(id=1244340236826816914, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Tab.1, caption=
Comparison of mid-span deflection of simply supported beams
, figureFileSmall=null, figureFileBig=null, tableContent=
| 梁高与跨径 | 单元数量 | 集中荷载 | 均布荷载 |
|---|
| 厚梁理论[34] | 文献[34]解 | 本研究解 | 厚梁理论[34] | 文献[34]解 | 本研究解 |
|---|
| H=1 L=10 | 2 | 1.288 40×10-5 | 1.288 40×10-5 | 1.288 52×10-5 | 8.004 50×10-5 | 8.004 50×10-5 | 8.005 30×10-5 |
| 4 | | 1.288 40×10-5 | 1.288 53×10-5 | | 8.004 50×10-5 | 8.005 30×10-5 |
| 8 | | 1.288 40×10-5 | 1.288 53×10-5 | | 8.004 52×10-5 | 8.005 30×10-5 |
| H=0.5 L=10 | 2 | 1.007 68×10-4 | 1.007 68×10-4 | 1.007 78×10-4 | 6.288 40×10-4 | 6.288 40×10-4 | 6.289 00×10-4 |
| 4 | | 1.007 68×10-4 | 1.007 78×10-4 | | 6.288 40×10-4 | 6.289 00×10-4 |
| 8 | | 1.007 69×10-4 | 1.007 78×10-4 | | 6.288 44×10-4 | 6.289 00×10-4 |
| H=0.1 L=10 | 2 | 1.250 38×102 | 1.250 38×10-2 | 1.250 51×10-2 | 7.814 42×10-2 | 7.814 42×10-2 | 7.815 20×10-2 |
| 4 | | 1.250 38×10-2 | 1.250 51×10-2 | | 7.814 42×10-2 | 7.815 20×10-2 |
| 8 | | 1.250 39×10-2 | 1.250 51×10-2 | | 7.814 43×10-2 | 7.815 20×10-2 |
| H=1 L=20 | 2 | 1.007 68×10-4 | 1.007 68×10-4 | 1.007 78×10-3 | 1.257 68×10-3 | 1.257 68×10-3 | 1.257 80×10-3 |
| 4 | | 1.007 68×10-4 | 1.007 78×10-4 | | 1.257 68×10-3 | 1.257 80×10-3 |
| 8 | | 1.007 69×10-4 | 1.007 78×10-4 | | 1.257 69×10-3 | 1.257 81×10-3 |
| H=0.5 L=20 | 2 | 8.015 36×10-4 | 8.015 36×10-4 | 8.016 16×10-4 | 1.001 54×10-2 | 1.001 54×10-2 | 1.001 64×10-2 |
| 4 | | 8.015 36×10-4 | 8.016 16×10-4 | | 1.001 54×10-2 | 1.001 64×10-2 |
| 8 | | 8.015 38×10-4 | 8.016 16×10-4 | | 1.001 53×10-2 | 1.001 64×10-2 |
| H=0.1 L=20 | 2 | 1.000 08-1 | 1.000 08-1 | 1.000 18-1 | 1.250 08 | 1.250 08 | 1.250 20 |
| 4 | | 1.000 08-1 | 1.000 18-1 | | 1.250 08 | 1.250 20 |
| 8 | | 1.000 08-1 | 1.000 18-1 | | 1.250 08 | 1.250 20 |
), ArticleFig(id=1244340236935868828, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=表1, caption=
简支梁跨中挠度对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 梁高与跨径 | 单元数量 | 集中荷载 | 均布荷载 |
|---|
| 厚梁理论[34] | 文献[34]解 | 本研究解 | 厚梁理论[34] | 文献[34]解 | 本研究解 |
|---|
| H=1 L=10 | 2 | 1.288 40×10-5 | 1.288 40×10-5 | 1.288 52×10-5 | 8.004 50×10-5 | 8.004 50×10-5 | 8.005 30×10-5 |
| 4 | | 1.288 40×10-5 | 1.288 53×10-5 | | 8.004 50×10-5 | 8.005 30×10-5 |
| 8 | | 1.288 40×10-5 | 1.288 53×10-5 | | 8.004 52×10-5 | 8.005 30×10-5 |
| H=0.5 L=10 | 2 | 1.007 68×10-4 | 1.007 68×10-4 | 1.007 78×10-4 | 6.288 40×10-4 | 6.288 40×10-4 | 6.289 00×10-4 |
| 4 | | 1.007 68×10-4 | 1.007 78×10-4 | | 6.288 40×10-4 | 6.289 00×10-4 |
| 8 | | 1.007 69×10-4 | 1.007 78×10-4 | | 6.288 44×10-4 | 6.289 00×10-4 |
| H=0.1 L=10 | 2 | 1.250 38×102 | 1.250 38×10-2 | 1.250 51×10-2 | 7.814 42×10-2 | 7.814 42×10-2 | 7.815 20×10-2 |
| 4 | | 1.250 38×10-2 | 1.250 51×10-2 | | 7.814 42×10-2 | 7.815 20×10-2 |
| 8 | | 1.250 39×10-2 | 1.250 51×10-2 | | 7.814 43×10-2 | 7.815 20×10-2 |
| H=1 L=20 | 2 | 1.007 68×10-4 | 1.007 68×10-4 | 1.007 78×10-3 | 1.257 68×10-3 | 1.257 68×10-3 | 1.257 80×10-3 |
| 4 | | 1.007 68×10-4 | 1.007 78×10-4 | | 1.257 68×10-3 | 1.257 80×10-3 |
| 8 | | 1.007 69×10-4 | 1.007 78×10-4 | | 1.257 69×10-3 | 1.257 81×10-3 |
| H=0.5 L=20 | 2 | 8.015 36×10-4 | 8.015 36×10-4 | 8.016 16×10-4 | 1.001 54×10-2 | 1.001 54×10-2 | 1.001 64×10-2 |
| 4 | | 8.015 36×10-4 | 8.016 16×10-4 | | 1.001 54×10-2 | 1.001 64×10-2 |
| 8 | | 8.015 38×10-4 | 8.016 16×10-4 | | 1.001 53×10-2 | 1.001 64×10-2 |
| H=0.1 L=20 | 2 | 1.000 08-1 | 1.000 08-1 | 1.000 18-1 | 1.250 08 | 1.250 08 | 1.250 20 |
| 4 | | 1.000 08-1 | 1.000 18-1 | | 1.250 08 | 1.250 20 |
| 8 | | 1.000 08-1 | 1.000 18-1 | | 1.250 08 | 1.250 20 |
), ArticleFig(id=1244340237053309347, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Tab.2, caption=
Comparison of load at cantilever end of cantilever beam
, figureFileSmall=null, figureFileBig=null, tableContent=
| 钢筋截面面积 | 荷载(考虑剪切)/kN | 相差/% | 荷载(不考虑剪切)/kN | 相差/% |
|---|
| 本研究 | ABAQUS | 本研究 | ABAQUS |
|---|
| As=0 | 2 802.1 | 2 744.5 | 2.05 | 2 957.8 | 2 957.8 | 0 |
| As≠0 | 3 035.4 | 2 967.2 | 2.25 | 3 218.9 | 3 218.7 | 0.01 |
), ArticleFig(id=1244340237195915690, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=表2, caption=
悬臂梁悬臂端荷载对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 钢筋截面面积 | 荷载(考虑剪切)/kN | 相差/% | 荷载(不考虑剪切)/kN | 相差/% |
|---|
| 本研究 | ABAQUS | 本研究 | ABAQUS |
|---|
| As=0 | 2 802.1 | 2 744.5 | 2.05 | 2 957.8 | 2 957.8 | 0 |
| As≠0 | 3 035.4 | 2 967.2 | 2.25 | 3 218.9 | 3 218.7 | 0.01 |
), ArticleFig(id=1244340237296578992, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=EN, label=Tab.3, caption=
Relative error of each calculated value in this paper and literature[27]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 恒载 | 徐变1年 | 徐变3年 |
|---|
| 跨中挠度 | 0.53 | 0.53 | 2.60 |
| 上缘应力 | 0.18 | 2.04 | 3.52 |
| 下缘应力 | 0.34 | 5.29 | 10.22 |
| 跨中处钢筋拉力 | 1.44 | 0.57 | 4.03 |
), ArticleFig(id=1244340237460156860, tenantId=1146029695717560320, journalId=1244295746212642849, articleId=1244340205415674206, language=CN, label=表3, caption=
本研究与文献[27]各计算值相对误差
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 恒载 | 徐变1年 | 徐变3年 |
|---|
| 跨中挠度 | 0.53 | 0.53 | 2.60 |
| 上缘应力 | 0.18 | 2.04 | 3.52 |
| 下缘应力 | 0.34 | 5.29 | 10.22 |
| 跨中处钢筋拉力 | 1.44 | 0.57 | 4.03 |
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