摘要
为提升阻尼器的复位性能,提出了由复位弹簧与形状记忆合金(shape memory alloy,SMA)组成的双重复位驱动体系,设计了新型双重自复位摩擦阻尼器,概述了其构造及工作原理。通过往复加载试验,考察了预紧力、加载位移幅值及复位弹簧组件刚度对阻尼器复位性能及耗能性能的影响;确定了阻尼器简化力学模型并进行数值模拟分析。结果表明:增大预紧力虽能提高阻尼器耗能性能,但同时增大了残余变形率;在预紧力和加载位移幅值较大的情况下,双重复位体系对阻尼器卸载后残余变形率的降低更加显著,有利于提升有高耗能需求的阻尼器的复位性能;简化力学模型与OpenSees有限元模拟得到的阻尼器滞回曲线、力学性能参数与试验结果吻合程度较高,验证了力学模型的准确性。通过有限元模拟分析了各功能部件对阻尼器整体性能贡献,分析结果反映了摩擦耗能装置对阻尼器整体耗能性能的贡献较好,并且复位弹簧对阻尼器复位性能的贡献随着预紧力的增大而愈加明显。
To improve the re-centering capacity of a damper,a dual self-centering driven system composed of reset spring and shape memory alloy(SMA)was proposed.A novel dual self-centering friction damper was designed,and its configuration and working principle were summarized.The effects of preloading force,loading displacement amplitude and the reset spring module stiffness on the re-centering and energy dissipation capacity were investigated by cyclic loading tests.The simplified mechanical model of the damper was established,and the analysis of numerical simulation was carried out.Results show that although increasing the preloading force can improve the energy dissipation capacity of the damper,it also increases the residual deformation rate.Under relatively large preloading force and loading displacement amplitude,the reduction of residual deformation rate caused by dual self-centering driven system is obvious,which is beneficial to improve the re-centering capacity of the damper with high energy consumption demand.The hysteresis curves and mechanical performance parameters of the damper obtained by simplified mechanical model and finite element simulation using OpenSees match the experimental results,which verifies the accuracy of the mechanical model.The contribution of each functional component to the overall performance of the damper was analyzed by finite element simulation.The analysis results reflect that the friction energy dissipation device has a good contribution to the overall energy dissipation capacity of the damper,and the contribution of the reset spring to the re-centering capacity of the damper becomes obvious with the increase of the preload.
作者
屈俊童
白宇翔
张超
李昱衡
王文彬
浦钧翔
QU Juntong;BAI Yuxiang;ZHANG Chao;LI Yuheng;WANG Wenbin;PU Junxiang(School of Architecture and Planning,Yunnan University,Kunming 650504,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第8期127-135,161,共10页
Journal of Vibration and Shock
基金
云南省教育厅科学研究基金(2023Y0260)。
