变摩擦自复位耗能支撑恢复力模型与试验研究  

Theoretical model and experimental verification of variable friction self-centering energy dissipative brace

作　　者：朱丽华[1] 刘通[1] 董尧荣 罗金武 李子杰 Zhu Lihua;Liu Tong;Dong Yaorong;Luo Jinwu;Li Zijie(Xi'an University of Architecture&Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学,陕西西安710055

出　　处：《土木工程学报》2025年第3期1-11,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(52278529);陕西省杰出青年科学基金(2022JC-35)。

摘　　要：以可恢复功能结构为背景,提出一种加工简单、装配便捷的变摩擦自复位耗能支撑。文章介绍该支撑的构造形式和工作原理,并对其受力性能进行理论分析,建立其恢复力理论预测模型。通过低周反复加载试验测试该自复位耗能支撑的受力性能,分析其滞回曲线、特征荷载和刚度、耗能能力。结果表明,装配弹簧和楔形块组的自复位耗能支撑荷载-位移曲线呈典型的“旗帜形”特征,滞回曲线的特征由弹簧预压长度、弹簧刚度和楔形块组数量等参数决定;支撑试件经历多次循环荷载作用后基本没有残余变形,具有良好的自复位性能和稳定的工作性能,其变形能力、耗能能力和复位能力均可通过调节弹簧与楔形块组的相关参数而改变;所提出的自复位支撑恢复力理论预测公式计算结果与试验结果吻合较好,可为工程应用提供参考。Aiming at developing structure with recoverable functions,a novel variable friction self-centering energy dissipative brace with simplicity in processing and convenience in assembly is proposed.The detailed configuration and working mechanism of the brace were introduced,and the theoretical prediction model of the restoring force was established.The feasibility of the detailed design of the new brace was verified by a cyclic test,and its hysteretic curve,characteristic load,characteristic stiffness and energy dissipative capacity were analyzed.The results show that the load-displacement curves of the new system equipped with spring and wedge block exhibit typical flag-shaped hysteretic behavior,and the characteristics of the curves are affected by key parameters such as spring precompressed length,spring stffness,number of wedge blocks,etc.After cyclic loading,there is no residual deformation in the brace,indicating that it has good self-centering capacity and stable working performance.The deformation capacity,energy dissipative capacity,and self-centering capacity of brace can be changed by adjusting the parameters of the spring and the wedge block.The calculated results of theoretical formula are in good agreement with the experimental results of the brace,and the research can be referred to by future projects.

关 键 词：自复位支撑 摩擦耗能 滞回性能 抗震性能 恢复力模型 

分 类 号：TU352.12[建筑科学—结构工程] TU317.1