碟簧自复位防屈曲支撑滞回性能试验与模拟  

Test and numerical simulation on the hysteretic behavior of a disc spring self-centering and buckling-restrained brace system

作　　者：丁玉坤[1,2,3] 刘洋涛 DING Yukun;LIU Yangtao(Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室,黑龙江哈尔滨150090 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工程大学学报》2022年第10期1424-1432,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51878217,51108125)。

摘　　要：为减小防屈曲支撑的残余变形,本文将防屈曲支撑和预压组合碟簧复位系统并联形成新型组装自复位防屈曲支撑。 通过拟静力试验和数值模拟考察了构造和复位比率对支撑滞回性能的影响。 试验和模拟均表明:与防屈曲支撑相比,自复位防屈曲支撑滞回曲线呈旗帜形且残余变形大幅减小;支撑断裂前滞回曲线稳定,试验与模拟结果较一致。 复位系统不仅能提供复位力,且可补充耗能。 随复位比率的增大,支撑残余位移减小。1/50 侧移角下,当复位比率 α大于 1.1 时,残余变形几乎消失。 为改善支撑低周疲劳性能和复位效果,钢板支撑宜采用较长的屈服段。 分析表明:总体上,当0.3≤α≤1.1 时,支撑残余侧移角与复位比率间呈线性关系。 复位系统内的内外螺杆的初拉力可适度调整自复位支撑受拉侧的初始刚度。To reduce the residual deformation of buckling-restrained braces (BRBs),a new assembled self-center-ingbrace (SCB),which lets a BRB part and a self-centering (SC) part with pre-compressed disc springs work in parallel,was constructed.Quasi-static tests and numerical simulations were performed to mainly investigate the effects of constructional details and the self-centerin g ratio (namely,the ratio of the pre-compressed force of the SCpart to the compression stren gth of the BRB part ata specific story drift) on the hysteretic behavior of SCBs.Both testsand simulations showedthat,compared with the BRB,the residual deformation of the SCBs with flag-shaped hystereticcurves was greatly reduced,the hysteretic curves were stable,and the simulation results agreed well with thetest result before the tension fracture of plate braces.The SC part could provide both restoring forces and addi-tional energy dissipation.Residual deformations decreased with increasing SC ratio and almost disappeared when th e SC ratio α(under 2%story drift) was larger than 1.1.Moreover,simulations reveal that t he yielding lengths ofthe plate brace need to be enlarged to improve the low cyclic fatigue behavior and SC effect ofthe brace.On the wh ole,the relation ship between residual deformation and α,from 0.3to 1.1,is linear.The pre-tension forces ofinner and outerpull rods in the SC part can adjust the initial stiffness of SCBs under tension.

关 键 词：防屈曲支撑 自复位 组装构造 碟簧 滞回性能 残余变形 试验 数值模拟 

分 类 号：TU393[建筑科学—结构工程]