超高层钢网格混凝土核心筒盒式结构动力弹塑性分析

Dynamic elasto plastic analysis of super tall steel grid concrete core tube box structure

为了研究超高层钢网格混凝土核心筒盒式结构在罕遇地震下的抗震性能,利用通用有限元软件ABAQUS建立了盒式结构的有限元模型。对钢网格的塑性变形和核心筒的损伤分布进行了研究,比较了结构弹塑性与弹性分析顶点时程位移和基底剪力。结果表明,新型盒式结构在罕遇地震作用下,钢网格梁产生了塑性变形,网格柱则基本保持弹性,大部分核心筒连梁损伤严重,底部核心筒也达到中等程度损伤。弹塑性顶点时程位移与弹性位移相比,峰值减小且出现了滞后的现象,弹塑性基底剪力也小于相应的弹性剪力。新型盒式结构的损伤和变形能满足大震不倒的性能要求。

In order to study the seismic performance of the hybrid structure of super tall steel grid concrete core tube under rare earthquake,the finite element model of the structure is established by using the finite element software ABAQUS. In this paper,the plastic deformation of steel mesh and the damage distribution of the core tube are studied. The results show that the new type of box structure under rare earthquake,steel grid beam plastic deformation generated,the grid column is essentially elastic,most serious damage of core tube coupling beams,the bottom of the core tube at a medium degree of injury. Compared with the elastic displacement,the peak value of the elastic-plastic time history displacement decreases with the decrease of the peak value. The damage and deformation of the new box structure can meet the requirements of large earthquakes.