自复位拉索支撑钢框架结构抗震性能研究  

Seismic performance of steel frame structure with self-centering cable braces

作　　者：徐刚[1] 郭彤[1] 李爱群[1,2] 赖正聪 张恒源[1] 王开睿 党隆基 XU Gang;GUO Tong;LI Aiqun;LAI Zhengcong;ZHANG Hengyuan;WANG Kairui;DANG Longji(Key Laboratory of Concrete and Prestressed Concrete Structures of China Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Yunnan Seismic Engineering Technology Research Center,Kunming University of Science and Technology,Kunming 650500,China;School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京211189 [2]北京建筑大学土木与交通工程学院,北京100044 [3]昆明理工大学云南省抗震工程技术研究中心,云南昆明650500 [4]河南工业大学土木工程学院,河南郑州450001

出　　处：《建筑结构学报》2024年第12期31-41,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52125802,52108440);江苏省自然科学基金项目(BK20210253)。

摘　　要：为了提升支撑框架结构的抗震韧性,提出一种可有效地避免受压屈曲的自复位拉索支撑。介绍了自复位拉索支撑的主体部件——自复位摩擦阻尼器的工作原理,并对其开展理论分析和试验验证,结果显示,自复位摩擦阻尼器的力-位移曲线呈典型的旗帜形,具有稳定的耗能能力和自复位能力。在此基础上,设计了三层自复位拉索支撑钢框架缩尺模型,包括对自复位摩擦阻尼器施加预应力的自复位拉索支撑框架模型和未施加预应力的自复位拉索支撑框架模型,并设计了普通钢框架模型用于对比,分别开展了振动台试验研究,并建立了有限元模型,进一步开展了参数分析研究。结果表明:施加预应力的自复位拉索支撑框架模型在地震作用后几乎没有残余变形,而与普通框架模型相比,未施加预应力的自复位拉索支撑框架模型的残余变形也显著减少;初始预应力的大小对结构位移响应有显著影响,施加预应力的自复位拉索支撑框架模型的位移响应小于普通框架模型和未施加预应力的自复位拉索支撑框架模型的;此外,施加预应力的自复位拉索支撑框架模型和未施加预应力的自复位拉索支撑框架模型的最大基底弯矩分别比普通框架模型的降低了32.5%和45.6%;随着地震水平的提高,结构楼层加速度放大系数逐渐减小;增加耗能元件会导致结构的残余位移和地震作用显著增大;柱底支座形式对结构的最大位移、残余位移等地震作用响应具有显著的影响。In order to improve the seismic resilience of the braced frame structure,a novel self-centering cable brace has been proposed to effectively prevent compression buckling.It features a self-centering friction damper whose working principle has been analyzed both theoretically and experimentally,displaying a flag-shaped force-displacement curve with stable energy dissipation and self-centering capabilities.Based on this,three-story scale model steel frames with self-centering cable braces was designed,including models with prestressed dampers and without prestress,alongside a conventional steel frame model for comparison.Shaking table tests were conducted followed by the development of finite element models that accurately simulated the experimental process.Parametric studies were carried out and the results indicate that model with prestressed dampers shows almost no residual deformation post-earthquake,and the residual deformation in model without prestress is significantly less than that in conventional steel frame model.The displacement response is critically influenced by the level of initial prestress,the model with prestressed dampers exhibits less displacement than both conventional steel frame model and model without prestress.Furthermore,the maximum base moment in models with prestressed dampers and without prestress is reduced by 32.5%and 45.6%,respectively,compared to conventional steel frame model.With increasing seismic intensity,the floor acceleration amplification factor is observed to decrease progressively.The addition of energy dissipation elements is found to notably increase the residual displacement and seismic force on the structures,with the type of column base having a significant effect on the maximum displacement and residual deformation.

关 键 词：钢框架 自复位拉索支撑 自复位摩擦阻尼器 振动台试验 抗震性能 

分 类 号：TU391[建筑科学—结构工程] TU352.1