超高层钢框架-钢筋混凝土核心筒结构的弹塑性时程分析

基于合理的材料弹塑性(损伤)本构关系模型,利用通用有限元软件ABAQUS建立了超高层钢框架-钢筋混凝土核心筒结构的精细有限元模型,考虑了结构的几何非线性和材料非线性性能,包括了钢材和混凝土材料的塑性损伤演化。进行罕遇地震作用下的弹塑性时程分析,获得了核心筒和楼板的损伤演化过程、顶点位移时程曲线、基底剪力时程曲线、楼层位移角包络曲线以及地震作用下整体结构的能量反应规律。结果表明,罕遇地震作用下混凝土最大损失出现在这类结构体系中核心筒底部,为保证其在罕遇地震作用下更好的工作性能,建议在核心筒底部加强区域增设型钢和提高剪力墙配筋率等措施。采用非线性有限元分析方法,可较为清晰的揭示这类结构体系在罕遇地震作用下的工作特性,有关方法可为同类研究提供参考。

Elastic-plastic time history analysis on super rise steel frame-core wall structure

Based on rational plasticity constitutive model of steel and concrete,the FEM package ABAQUS was adopted to establish the fine FEM model of super rise steel frame-R.C.core wall structure,including the geometric nonlinearity and the material nonlinearity,such as the plastic damage development of concrete material properties.The elastic-plastic time history analysis of the structure under rarely met earthquake was carried out.The calculating results,including the damage evolution process of core-wall and floor slab,vertex displacement time-history curves,basal shear time-history curves,and floor displacement angle envelope curves as well as the energy response law of the whole structure were attained.The results show that the maximum damage of concrete exists in the bottom of the super rise steel frame-R.C.core wall structure,and additional profile steels and reinforcing bars were suggested to be set to improve the workable ability under rarely met earthquake.It can also be seen that the elastic-plastic time history analysis can reveal the behaviours of the structural system under rare earthquake,and the method mentioned may give a reference to correlative researches.