具有位移放大功能的摩擦自复位支撑及其在双柱式桥墩中的应用  

New type of friction self-centering brace with displacement amplification function and its application in double column piers

作　　者：王德斌 何杰 孙治国 王东升 WANG Debin;HE Jie;SUN Zhiguo;WANG Dongshen(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China;Key Laboratory of Building Damage Mechanism and Defense,School of Disaster Prevention and Technology,China Seismological Bureau,Beijing 101601,China;College of Civil Engineering and Communications,Hebei University of Technology,Tianjin 300401)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028 [2]中国地震局防灾科技学院建筑物破坏机理与防御重点实验室,北京101601 [3]河北工业大学土木与交通学院,天津300401

出　　处：《振动与冲击》2023年第2期51-59,共9页Journal of Vibration and Shock

基　　金：辽宁省教育厅科学研究项目(LJKMZ20220860);河北省重点研发计划项目(19275417D);国家自然科学基金(51978167)

摘　　要：针对传统自复位支撑在低强度地震作用下难以充分耗能的问题,基于桥式放大工作机理提出了一种具有位移放大功能的扭转摩擦自复位支撑(self-centering displacement amplified rotational friction brace,SC-DARFB)。介绍了其基本构造、工作原理,给出了其理论恢复力模型,通过数值模拟研究了不同初始放大角度下支撑的力学性能,并对附加SC-DARFB的双柱式桥墩结构进行地震响应分析。结果表明:理论恢复力模型能够有效描述SC-DARFB的滞回性能,与数值模拟结果吻合较好;随着初始放大角度的减小,SC-DARFB起滑荷载、最大荷载和耗能能力均有显著提高,且具有较强的自复位能力;合理的设计能够确保支撑的拉、压最大荷载比满足美国钢结构规范限值1-3,基于此原因建议SC-DARFB采用倒V型对称布置形式;将SC-DARFB应用于双柱式桥墩结构,能够有效减小双柱式桥墩结构的最大墩顶位移及震后桥墩残余位移角,通过减小SC-DARFB初始放大角度能够进一步提高双柱式桥墩的减震耗能能力。The energy dissipation function could not be fully used in traditional self-centering braces. A torsional friction self-centering brace with displacement amplification function(SC-DARFB) were proposed based on the working principle of the bridge type amplifier. The basic structure and working principle of the SC-DARFB were introduced, and its theoretical restoring force model was proposed. The mechanical properties of the braces under different initial amplification angle were studied by numerical simulation, and the seismic responses of the double-column pier with SC-DARFB were analyzed. It is found that the hysteretic performance of the SC-DARFB can be effectively described by the proposed theoretical restoring force model, which is in good agreement with the numerical simulation results. With the decrease of the initial amplification angle, the slip load, the maximum load and the energy dissipation capacity of the SC-DARFB are significantly improved, and the SC-DARFB shows good self-centering ability. Reasonable design will ensure that the maximum tension/compression load ratio meets the limit of 1.3 in the American Steel Structure Code. As a result, it is suggested to use an inverted V-shaped symmetrical SC-DARFB. The maximum displacements and residual drift ratio of the double-column piers will be decreased significantly by using the SC-DARFB. The seismic dissipation capacity of the double-column piers can be further improved by reducing the initial amplification angle of the SC-DARFB.

关 键 词：摩擦耗能 位移放大 恢复力 桥梁抗震 双柱墩 

分 类 号：TU352.1[建筑科学—结构工程]