弹性和弹塑性分析模型一致性影响因素研究
|
摘要
对于超高超限的建筑结构,在进行弹塑性分析之前,应使弹塑性分析模型与弹性分析模型在弹性阶段的结果要基本一致,一般将结构基本周期作为模型一致性判别的基本依据。重点讨论了结构质量和刚度的影响因素。进行结构质量对比时应重点关注楼板自重以及地下室部分的质量,如果这两个方面考虑方式不同,可能导致弹性和弹塑性分析模型质量相差较大。结构底部嵌固部位、刚性楼板假定、中梁刚度放大系数、钢筋考虑与否、连梁模拟方式、单元网格尺寸、连梁刚度折减系数等因素对于结构刚度和周期都有一定的影响,在进行模型对比时要特别注意。应尽可能保证这些参数设置统一,以保证弹性和弹塑性分析模型周期的一致性。
For the beyond-code structure,before elasto-plastic analysis,the results in elastic stage for the elastic model and elasto-plastic model should be basically consistent.The fundamental periods of the structure are always regarded as the basis for model consistency judgment.The influences of model mass and stiffness were discused emphatically.When we compare the model mass,we should pay more attention on the mass of the slab and underground part,If these two items are different between elastic model and elasto-plastic model,the total mass will differ considerably.Fixed position of the structure,rigid floor assumption,beam stiffness amplification coefficient,rebar consideration,simulation method of the coupling beam,element mesh size and stiffness reduction factor of the coupling beam will affect the structural stiffness and the fundamental period,which could be noticed particularly when we conduct model comparison,these parameters should be uniform to make sure the consistency of period of the elastic and elasto-plastic analysis model.
For the beyond-code structure,before elasto-plastic analysis,the results in elastic stage for the elastic model and elasto-plastic model should be basically consistent.The fundamental periods of the structure are always regarded as the basis for model consistency judgment.The influences of model mass and stiffness were discused emphatically.When we compare the model mass,we should pay more attention on the mass of the slab and underground part,If these two items are different between elastic model and elasto-plastic model,the total mass will differ considerably.Fixed position of the structure,rigid floor assumption,beam stiffness amplification coefficient,rebar consideration,simulation method of the coupling beam,element mesh size and stiffness reduction factor of the coupling beam will affect the structural stiffness and the fundamental period,which could be noticed particularly when we conduct model comparison,these parameters should be uniform to make sure the consistency of period of the elastic and elasto-plastic analysis model.
引文
[1]刘军,鲍利.高层建筑结构嵌固端选取的探讨[J].建筑结构,2012,42(S1):339-342.
[2]彭丽红,张元坤.关于高层建筑结构嵌固端的探讨[J].广东土木与建筑,2011(9):7-9.
[3]高层建筑混凝土结构技术规程:JGJ 3—2010[S].北京:中国建筑工业出版社,2011.
[4]武云鹏.剪力墙与框架梁的连接过渡算法研究[J].建筑结构,2016,46(17):63-67.
[5]孟祥良,邓雪.PKPM连梁在不同输入方法下计算结果分析与对比[J].建筑结构,2016,46(13):57-60.
[6]建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.
[2]彭丽红,张元坤.关于高层建筑结构嵌固端的探讨[J].广东土木与建筑,2011(9):7-9.
[3]高层建筑混凝土结构技术规程:JGJ 3—2010[S].北京:中国建筑工业出版社,2011.
[4]武云鹏.剪力墙与框架梁的连接过渡算法研究[J].建筑结构,2016,46(17):63-67.
[5]孟祥良,邓雪.PKPM连梁在不同输入方法下计算结果分析与对比[J].建筑结构,2016,46(13):57-60.
[6]建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.