耗能梁段布置方式对含可更换剪切型耗能梁段的高强钢框筒结构抗震性能的影响  

Effects of Layout of Shear Links on the Seismic Performance of High-Strength Steel Framed-Tube Structure with Replaceable Shear Links

作　　者：张浩[1] 连鸣[1] 苏明周[1] ZHANG Hao;LIAN Ming;SU Mingzhou(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《建筑钢结构进展》2020年第5期51-63,132,共14页Progress in Steel Building Structures

基　　金：国家自然基金项目(51708444);陕西省高校科协青年人才托举计划项目(20170517);陕西省自然科学基金(2018JQ5074);陕西省教育厅专项科研计划项目(18JK0456);陕西省博士后科研项目(2017年)。

摘　　要：针对传统钢框筒结构地震耗能差、震后修复难度大和难以实现"强柱弱梁"的设计理念等问题,提出了一种新型高层钢结构体系——含可更换剪切型耗能梁段的高强钢框筒结构(HSS-FTS)。为研究耗能梁段布置方式对HSS-FTS抗震性能的影响,设计了30层的HSS-FTS系列算例并建立其有限元模型,依据提出的耗能梁段布置原则,给出了6种不同的耗能梁段布置方式。验证了有限元建模的合理性,对有限元模型分别进行反应谱分析、静力Pushover分析和动力弹塑性时程分析。分析结果表明:HSS-FTS改善了传统钢框筒结构的耗能能力,主要依靠耗能梁段塑性剪切变形耗散地震能量。不同的耗能梁段布置方式对结构的基底剪力、层间侧移角、承载能力、耗能能力、剪力滞后效应、塑性铰发展模式以及震后残余层间侧移角均有显著影响,但对结构的整体抗侧刚度影响较小。耗能梁段采用间隔布置3跨或连续布置5跨时,HSS-FTS在强震下的层间侧移角分布均匀,没有薄弱层出现,对震后残余层间侧移角的控制效果更为显著,且具有优良的耗能能力和理想的整体失效模式。A high strength steel frame-tube structure(HSS-FTS)with replaceable shear links is proposed to improve the poor seismic energy dissipation,repairable capacities and"strong column/weak beam"design principle of traditional steel framed-tube structure,which combines the advantages of shear link and high-strength steel.According to the layout principle of shear link proposed in this paper,six different shear link layout ways are considered.Several finite element models(FEMs)of a series of 30-story HSS-FTS are built using SAP2000 program to investigate the effects of shear link layout to the seismic performance of HSS-FTS.The rationalities of FEMs are verified,and the elastic response,nonlinear static pushover and dynamic time history analyses are performed.The analysis results indicate that the energy dissipation capacity of the HSS-FTS is improved significantly which mainly relies on the plastic shear deformation of the link to dissipate seismic energy.Different layout ways of shear link has significant influence to base shear force,inter-story drift angle,load-bearing capacity,energy dissipation capacity,shear lag effect,plastic hinge development mechanism and residual inter-story deformation of post-earthquake,but small influence to overall lateral stiffness.When three spans are employed at intervals and five spans are employed continuously with shear links are adopted.The inter-story drift angles of HSS-FTS under severe earthquakes are more uniform and no weak layers appeared,and the residual inter-story drifts are more acceptable.These two layout ways for shear links could make the structure have better energy dissipation capacity and the preferred failure mode.

关 键 词：框筒结构 可更换剪切型耗能梁段 高强钢 布置方式 抗震性能 动力时程分析 静力Pushover分析 

分 类 号：TU393.2[建筑科学—结构工程]