U-T坡面变摩擦阻尼器力学性能及减震效果研究  

Research on mechanical performance and seismic energy dissipation effect of U-T slope variable friction damper

作　　者：李澈 张健豪 王兵 薛彦涛 LI Che;ZHANG Jianhao;WANG Bing;XUE Yantao(National Engineering Research Center of Building Technology,Beijing 100013,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]国家建筑工程技术研究中心,北京100013 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑结构学报》2024年第6期97-106,共10页Journal of Building Structures

摘　　要：为了解决摩擦阻尼器出力单一,无法适应各个水准地震的问题,提出了一种U-T坡面原型机构,当其发生远离完全咬合点的错动时,由于坡面作用,能够在法向产生增量变形,且在此过程中坡面保持连续接触。应用此原型机构,设计并制作了能够产生狗骨形滞回曲线的U-T变摩擦阻尼器,试验结果表明:阻尼器的阻尼力与设计值基本一致;阻尼器表现出良好的耐疲劳性能,满足JGJ 297—2013《建筑消能减震技术规程》中对摩擦消能器力学性能要求。针对阻尼器开展有限元分析,验证U-T变摩擦阻尼器工作机理及各部件受力工作状态;并采用ABAQUS的自定义材料接口UMAT,编写用于模拟狗骨形滞回曲线阻尼器的子程序进行数值模拟分析,以一设置该阻尼器的钢框架结构为例,对比分析狗骨形滞回曲线变摩擦阻尼器、普通摩擦阻尼器的减震效果。分析结果表明,狗骨形滞回曲线变摩擦阻尼器具有更好的减震效果,且对预紧力损失不敏感。In order to solve the problem that the normal friction damper can only produce single damper force and cannot meet different energy dissipation demands under different ground motion levels,a U-T slope prototype mechanism was proposed,which can generate incremental deformation in the normal direction due to the slope action when the displacement occurs away from the full occlusion point,and the slope maintains a continuous contact in the process.Based on this prototype,a variable friction damper capable of generating‘dog-bone-shaped’hysteresis curve was designed and tested.The experimental results show that the damping force of the damper is basically consistent with its design value,the damper shows a well fatigue resistance and meet the mechanical performance requirements for friction energy dissipation device in JGJ 297-2013‘Technical specification for seismic energy dissipation of buildings'.Finite element analysis is carried out for the damper to verify its working mechanism and the working state of each component of the damper.Using ABAQUS software as the platform and using its user material interface(UMAT),a UMAT subroutine for simulating the dog-bone hysteresis curve damper was written and used as a tool for numerical simulation analysis.Taking a steel frame structure with dampers as an example,the damping effects of frame with dog-bone hysteresis curve variable friction dampers and frame with ordinary friction dampers were compared and analyzed,indicating that the dog-bone hysteresis curve variable friction dampers have better damping effects,and it is not sensitive to the loss of pre-tightening force.

关 键 词：变摩擦阻尼器 U-T坡面 消能减震 被动控制 滞回曲线 附加阻尼比 

分 类 号：TU352.1[建筑科学—结构工程]