旋转放大型摩擦自复位支撑性能试验及恢复力模型验证  

Performance tests of rotating-amplification type friction self-centering brace and its restoring force model verification

作　　者：王德斌 张昕岳 付兴 王文明 刘璐 WANG Debin;ZHANG Xinyue;FU Xing;WANG Wenming;LIU Lu(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Beijing Municipal Road&Bridge Group Co.,Ltd.,Beijing 100032,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028 [2]大连理工大学建设工程学部,辽宁大连116024 [3]山东建筑大学土木工程学院,济南250101 [4]北京市政路桥股份有限公司,北京100032

出　　处：《振动与冲击》2024年第9期8-17,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52378483);辽宁省教育厅科研项目(LJKMZ20220860)。

摘　　要：为解决传统自复位支撑耗能能力不足而位移放大阻尼器缺少复位能力的问题,基于桥式放大工作机理提出了一种具有位移放大功能的摩擦自复位支撑(self-centering displacement amplification function brace,SC-DAFB)。该文介绍了SC-DAFB基本构造、工作机理,阐述了SC-DAFB耗能系统的位移及SC-DAFB受力放大机理,推导出了SC-DAFB各加载阶段的恢复力计算公式,通过对6组不同工况的SC-DAFB进行低周往复加载试验,得到并对比分析了SC-DAFB的承载能力、滞回曲线、耗能性能及残余位移等关键力学性能指标。结果表明:SC-DAFB滞回曲线饱满,具有典型的旗帜型特征,但存在一定程度的非对称特性;减小初始放大角度能够有效提升SC-DAFB的承载能力和耗能性能,当复位比为1.3时,与无位移放大SC-DAFB相比,30°初始放大角度下SC-DAFB屈服荷载和最大荷载分别提高47.6%和29.4%,但SC-DAFB残余变形略有增加;理论计算与试验得到的SC-DAFB滞回曲线对比结果表明,建立的分段式理论恢复力模型与试验结果吻合较好,验证了理论恢复力模型的准确性。Here,to solve problems of insufficient energy dissipation capacity of traditional self-centering brace and lack of resetting capacity of displacement amplification damper,a friction self-centering displacement amplification function brace(SC-DAFB)was proposed based on the working mechanism of bridge type amplification.Basic structure and working mechanism of SC-DAFB were introduced,displacement and force amplification mechanisms of brace energy dissipation system were explained.Calculation formulas for brace restoring force in various loading stages were derived.Low cycle reciprocating loading tests were conducted for 6 groups of SC-DAFB under different working conditions to obtain SC-DAFB key mechanical performance indexes of load-bearing capacity,hysteresis curve,energy dissipation performance and residual displacement,they were analyzed contrastively.The results showed that SC-DAFB hysteresis curve is full,and has typical flag type features and a certain degree of asymmetry;reducing initial amplification angle can effectively improve its load-bearing capacity and energy dissipation performance;when the reset ratio is 1.3,compared with non-displacement amplification brace,SC-DAFB yield load and maximum load increase by 47.6%and 29.4%,respectively under 30°initial amplification angle,but its residual deformation slightly increases;comparing SC-DAFB hysteresis curves obtained with theoretical calculation and tests,the former obtained with the established segmented theoretical restoring force model agrees well with the latter obtained with tests to verify the correctness of the theoretical restoring force model.

关 键 词：自复位 摩擦耗能 位移放大 残余变形 

分 类 号：TU352.1[建筑科学—结构工程] TU317.1