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Story shear distribution of high-strength steel frame with D-eccentric brace based on multi-seismic-hazard levels

DOI：10.7511/jslx20221228002

 作者 单位 E-mail 李慎 西安理工大学 土木建筑工程学院, 西安 710048 lishen2861@163.com 丁世豪 西安理工大学 土木建筑工程学院, 西安 710048 李晓蕾 西安理工大学 土木建筑工程学院, 西安 710048 穆林 西安理工大学 土木建筑工程学院, 西安 710048

高强钢框架-D形偏心支撑结构中耗能梁段采用Q355钢,非耗能构件(即框架梁和柱)采用高强度钢材,形成一种新型结构体系。耗能梁段在结构遭遇罕遇地震时充分发挥塑性变形耗能,保护高强钢框架处于弹性受力状态,高强钢框架-D形偏心支撑结构由于在塑性状态下结构刚度发生改变,其层剪力分布模式不再符合基于强度的设计理论,因此,本文研究了高强钢框架-D形偏心支撑结构在多水准地震动状态下的层剪力分布模式。本文设计了四种不同层数(4层,8层,12层和16层)和三种不同耗能梁段长度(900 mm,1000 mm和1100 mm)的高强钢框架-D形偏心支撑结构,输入40条近场脉冲地震和40条远场地震记录,得到结构在多遇地震、设防地震、罕遇地震以及极罕遇地震下的层剪力分布模式,并对罕遇地震下的层剪力分布模式进行参数标定,获取塑性状态下结构的弹塑性侧向力分布状态。

A high-strength steel frame with D-eccentric braces (D-HSS-EBF) includs Q355 steel for the energy-dissipating components,while the non-energy dissipating components,such as columns and beams,uses the high strength steel Q460,which is a new seismic resistant structure.The links are found to develop full plastic deformation when the structure suffer rare earthquakes.The story shear distribution is not suitable for the capacity-based design method,because the stiffness of D-HSS-EBF is changed under plastic state.Therefore,this paper presents the elastic-plastic story shear distribution of D-HSS-EBF under various seismic hazard levels.Based on this,the prototype structures of D-HSS-EBF are designed considering different stories (4-,8-,12-,and 16-stories) and different link length (900 mm,1000 mm and 1100 mm),and the story shear distribution modes under various seismic hazard levels are raised under near-fault ground motions and far-fault ground motions.Furthermore,the parameters of the story shear distribution under rare earthquakes are determined by the elastic-plastic lateral force.