基于多水准的高强钢框架-D形偏心支撑结构层剪力分布研究  

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

作　　者：李慎[1] 丁世豪 李晓蕾[1] 穆林 LI Shen;DING Shi-hao;LI Xiao-lei;MU Lin(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《计算力学学报》2024年第4期734-741,共8页Chinese Journal of Computational Mechanics

基　　金：陕西省自然科学基金面上项目(2021JM330);中国博士后基金(2019M653878XB);陕西省教育厅专项(19JK0588)资助.

摘　　要：高强钢框架GD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GD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GD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(900mm,1000mm和1100mm)的高强钢框架GD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.

关 键 词：D形偏心支撑 层剪力分布模式 近场脉冲地震 高强钢框架 

分 类 号：TU391[建筑科学—结构工程] O302[理学—力学]