超高层钢筋混凝土框架-核心筒结构的弹塑性时程分析

Elastic-plastic Time History Analysis on Super-rise Frame-core Structure

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建立了超高层钢筋混凝土框架-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,包括钢材和混凝土材料的塑性损伤演化。进行了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、基底剪力时程曲线以及楼层位移角包络曲线。结果表明,罕遇地震作用下,混凝土最大损伤出现在这类结构体系中核心筒底部和中上部,为保证其在罕遇地震作用下更好的工作性能,建议在相关区域增设型钢或提高剪力墙配筋率等措施。采用非线性有限元分析方法,可较为清晰地揭示这类结构体系在罕遇地震作用下的工作特性,为同类研究提供参考。

Based on rational damaged plasticity constitutive model of steel and concrete, the FEM package ABAQUS is adopted to establish the fine FEM mode of super-rise steel frame RC core wall structure, including the geometric nonlinearity and the material nonlinearity, such as the damaged plasticity development of concrete material properties. The elastic-plastic time history analysis of the structure under rarely met earthquake is carried out in this paper. The calculated results, including damage evolution process of core- wall and floor slab, vertex displacement time-history curves, basal shear time-history curves, and floor displacement angle envelope curve and energy response law of the whole structure are attained. The results show that the maximum damage of concrete exists in the bottom of the super-rise steel frame RC core wall structure, and additional profile steels and reinforcing bars are 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 behaviour of the structural system under rare earthquake, and the method mentioned in this paper may be referred for correlative research.