钢管混凝土-钢板深梁结构抗震性能分析

Analysis of seismic behavior of structure with CFST columns and deep steel plate beams

提出了钢管混凝土-钢板深梁结构,它由钢管混凝土柱、柱间钢板深梁两种构件组成。为深入研究该结构的抗震性能,在典型模型构件试验基础上,用ABAQUS软件对不同钢板深梁布置与间距、不同钢板深梁厚度、不同钢板深梁跨高比的试件进行了数值模拟,模拟中考虑了基础锚固滑移对试件顶部位移的影响。研究表明:随着钢板深梁布置数量的增多和钢板深梁厚度的增大,结构承载力和刚度明显提高,但提高幅度逐渐减慢,而延性有所降低;随着钢板深梁跨高比的增大,结构的刚度和承载力逐步减小,延性逐步提高;合理设计钢板深梁布置位置与间距的试件与整体钢板试件相比,虽承载力和刚度有所降低,但延性和钢板弹塑性耗能能力显著提高,有利于抗震。在满足构造要求下,钢管混凝土-钢板深梁结构具有良好的抗震耗能性能,可用于高层建筑结构抗震设计。

A structure composed of two kinds of members, concrete filled steel tube （CFST） columns and deep steel plate beams set between columns, was presented. In order to explore its seismic behavior, numerical simula- tion of specimens with different spaces between beams, different thickness of deep steel plate beams, and different span-depth ratio was carried out by software ABAQUS based on tests of typical models. The influence of anchor and slip of foundation on the displacement at the top of models was considered in simulation. Results show that the load- bearing capacity and stiffness of the models increase significantly with the increase of amount and thickness of deep steel plate beams, but the increased amplitude drops gradually and ductility reduces. The stiffness and load-bearing capacity gradually decrease and the ductility increases with the increase of the span-depth ratio. Compared with general integrated steel specimen, the specimen designed reasonably in arrangement of location and spacing of deep steel plate beam shows better ductility and higher elastic-plastic energy dissipation capacity except that the load- bearing capacity and stiffness decrease. The structure with CFST columns and deep steel plate beams shows better seismic behavior and higher energy dissipation capacity under suitable constructional requirements. It can be ap- plied to the structure design of hizh-rise buildings.