曲线钢-混凝土结合梁桥的混凝土收缩徐变效应计算
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摘要
将混凝土的应变分解为瞬时应变、徐变和收缩应变三部分之和,基于CEB-FIP模型提出了模拟收缩徐变的简明本构模型.根据本构模型给出了收缩徐变产生的单元等效结点力增量计算式,并结合迭代法逐步计算原理给出了计算收缩徐变的有限元公式.最后,应用收缩徐变模型和对应的有限元计算理论编制程序计算了曲线钢-混凝土结合梁桥的收缩徐变效应,结果表明收缩徐变对曲线钢-混凝土结合梁桥的内力和变形均有很大的影响.
The strain of concrete was decomposed into instantaneous strain,creep strain and shrinkage strain.A simple constitutive model for modeling shrinkage and creep effect on concrete was proposed based on CEB-FIP model.The proposed model was applied to derive the element equivalent nodal force increment,and the finite element formulation for shrinkage and creep calculation was presented based on the step-by-step iterative method.Finally,the shrinkage and creep model and its corresponding finite element formulation were applied to calculate the effect of shrinkage and creep on the curved steel-concrete composite beam bridge.The result of calculation shows that the shrinkage and creep of concrete have a great influence on internal force and deformation in the curved steel-concrete composite beam bridge.
The strain of concrete was decomposed into instantaneous strain,creep strain and shrinkage strain.A simple constitutive model for modeling shrinkage and creep effect on concrete was proposed based on CEB-FIP model.The proposed model was applied to derive the element equivalent nodal force increment,and the finite element formulation for shrinkage and creep calculation was presented based on the step-by-step iterative method.Finally,the shrinkage and creep model and its corresponding finite element formulation were applied to calculate the effect of shrinkage and creep on the curved steel-concrete composite beam bridge.The result of calculation shows that the shrinkage and creep of concrete have a great influence on internal force and deformation in the curved steel-concrete composite beam bridge.
引文
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[2]Johnson R P.Composite Structures of Steel and Concrete:Beams,Slabs,Columns,and Frames for Building[M].3rd Revised edlition.Oxfrd:Blackwell publishing ltd,2004.
[3]Lawther R,Gilbert R I.Deflection analysis of composite structures using the rate of creep method[J].the Structural Engineer,1992,70(12):78-85.
[4]周舟.预应力混凝土箱梁桥中混凝土收缩徐变的影响研究[D].长沙:长沙理工大学,2006.
[5]丁文胜,吕志涛,孟少平,等.混凝土收缩徐变预测模型的分析比较[J].桥梁建设,2004,6:13-16.
[6]汪剑,方志.大跨预应力混凝土箱梁收缩徐变效应测试与分析[J].土木工程学报,2008,41(1):70-81.
[7]JTG D62-2004.公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[8]潘家英.混凝土结构的徐变计算[J].土木工程学报,1983,15(4):29-40.
[9]王书庆.徐变自动增量分析方法及其在BRCAD系统中的实现[C]//中国公路学会桥梁结构和结构工程学会1999年桥梁学术讨论会论文集.北京:人民交通出版社,1999.
[10]郑信光.变位法分析混凝土桥梁的徐变影响[J].重庆交通学院学报,1984,3(3):31,39.
[11]郑信光,韩振勇,项海帆.桥梁节段施工过程的徐变分析[J].同济大学学报,1991,19(3):355,362.
[12]朱伯芳.有限单元法原理与应用[M].北京:水利电力出版社,1979.
[13]陈明祥.弹塑性力学[M].北京:科学出版社,2007.
[14]Comit E Euro-Internation al Du B.Eton.CEB-FIP Model Code 1990:Design Code[M].London:Thomas Telford Ltd,1993.
[2]Johnson R P.Composite Structures of Steel and Concrete:Beams,Slabs,Columns,and Frames for Building[M].3rd Revised edlition.Oxfrd:Blackwell publishing ltd,2004.
[3]Lawther R,Gilbert R I.Deflection analysis of composite structures using the rate of creep method[J].the Structural Engineer,1992,70(12):78-85.
[4]周舟.预应力混凝土箱梁桥中混凝土收缩徐变的影响研究[D].长沙:长沙理工大学,2006.
[5]丁文胜,吕志涛,孟少平,等.混凝土收缩徐变预测模型的分析比较[J].桥梁建设,2004,6:13-16.
[6]汪剑,方志.大跨预应力混凝土箱梁收缩徐变效应测试与分析[J].土木工程学报,2008,41(1):70-81.
[7]JTG D62-2004.公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[8]潘家英.混凝土结构的徐变计算[J].土木工程学报,1983,15(4):29-40.
[9]王书庆.徐变自动增量分析方法及其在BRCAD系统中的实现[C]//中国公路学会桥梁结构和结构工程学会1999年桥梁学术讨论会论文集.北京:人民交通出版社,1999.
[10]郑信光.变位法分析混凝土桥梁的徐变影响[J].重庆交通学院学报,1984,3(3):31,39.
[11]郑信光,韩振勇,项海帆.桥梁节段施工过程的徐变分析[J].同济大学学报,1991,19(3):355,362.
[12]朱伯芳.有限单元法原理与应用[M].北京:水利电力出版社,1979.
[13]陈明祥.弹塑性力学[M].北京:科学出版社,2007.
[14]Comit E Euro-Internation al Du B.Eton.CEB-FIP Model Code 1990:Design Code[M].London:Thomas Telford Ltd,1993.