钢框架-无黏结内藏钢板支撑剪力墙双重体系抗震性能分析

Analysis of aseismic performance for dual system composed of steel frame and unbonded steel plate brace encased in reinforced concrete panel

通过对钢框架-无黏结内藏钢板支撑剪力墙(支撑墙板)双重抗侧力体系抗震设计的探讨和抗震性能分析,考察钢框架部分抗侧承载力的调整对结构抗震性能的影响。时程分析表明:总体上,随框架的调整加强,结构层间侧移及构件的塑性发展程度减小,人字形支撑承受的楼层重力减小,有益于支撑墙板的受力,拉、压支撑的滞回曲线关于原点较对称,但结构用钢量和楼层剪力增大。推覆分析表明:结构最大层间侧移角达1/50时,调整加强的框架塑性发展减幅不明显。综合分析结果,建议双重体系设计中框架的调整加强,宜按照删除支撑后的框架能独立承担结构底部总剪力的25%来进行。

The aseismic design for the dual system composed of the steel frame and the unbonded steel plate brace encased in reinforced concrete panel(Panel BRB) was studied to examine the effect of the lateral resistance of steel frames on the aseismic performance of the structures.The time-history analysis reveals that,generally,the inter-story deformation,the plastic deformation of members and the weight of floors carried by the chevron Panel BRBs decrease when the frames are reinforced.It is advantageous to the working behavior of the Panel BRBs,and the hysteretic curves of the left brace and the right one in a chevron Panel BRB are more symmetrical about the origin of coordinates.Whereas,the amount of steel used in structures and the story shear forces of the structures increase when frame members are enlarged,and a reduction in the extent of the plastic development for the frames is not remarkable when the maximum inter-story drift of structures is 1/50 according to the push-over analysis.Based on the results,it is advised that the aseismic design for the dual systems should be performed to ensure that the frame can independently resist 25 percent of the total base shear force of the structure.