摘要
为了实现分级保护主体结构同时减小传统耗能阻尼器在强震作用下的残余变形的目的,提出一种基于形状记忆合金(shape memory alloy,SMA)板环的新型变滞回性能阻尼器(variable hysteresis performance damper based on shape memory alloy,SMA-VHD)。首先阐明了新型阻尼器的基本构造,揭示了其变滞回性能工作机理和自复位原理。通过对SMA板材进行材性试验确定了SMA板材的关键性能参数,进而建立阻尼器精细化有限元模型,系统研究阻尼器的滞回性能及参数影响规律。最后将新型阻尼器应用于RC排架墩中,通过动力时程分析研究附加阻尼器桥墩结构的分阶段抗震性能。研究结果表明:SMA板材应力应变关系呈“旗帜型”,具有良好的自复位能力;SMA-VHD滞回曲线呈现明显分级平台,随着阻尼器变形的增加,其滞回曲线由饱满的矩形变为具有自复位功能的“旗帜型”,表明该阻尼器具有变滞回性能的特性;将SMA-VHD应用到RC排架墩中,可有效实现结构的分级抗震,提高桥墩结构的抗震性能水平。
To achieve the purpose of multi-level protection of the main structure and reduce the residual deformation of conventional energy dissipation dampers under strong earthquakes,a novel variable hysteresis performance damper based on shape memory alloy(SMA-VHD)was proposed.The damper’s configuration,variable hysteresis performance,and working mechanism were elucidated.A refined finite element model of the damper was formulated by leveraging the outcomes of plate specimen tests using SMA.The hysteresis performance study and parametric investigations are based on the verified finite element model.Finally,the multi-level seismic performance of a double-column RC bridge bent with additional variable hysteresis performance damper was studied by dynamic time-history analysis.Results indicate that SMA exhibits a distinctive stress-strain relationship resembling a flag,which shows good self-centering capability.The SMA-VHD actualizes variable hysteresis performance,with the hysteresis response transitioning from rectangular to flag-shaped as the damper deformation increases,accompanied by a prominent multi-level platform.Applying SMA-VHD to RC bridge bents imparts multi-level seismic performance and enhances the structure’s seismic performance.
作者
董慧慧
李艳玲
韩强
杜修力
DONG Huihui;LI Yanling;HAN Qiang;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第8期98-108,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(52278475)
北京市教育委员会(KM202210005020)。
