摘要
介绍摩擦摆的力学特性及性能优势,结合甘肃陇南区某新建幼儿园项目,阐述常规摩擦摆设计中高、低摩擦型摩擦摆组合设计特点,并提出采用低摩擦型摩擦摆配合黏滞阻尼器和低摩擦型大曲率半径摩擦摆配合黏滞阻尼器等两种设计方案,结合多工况下罕遇地震弹塑性时程结果进行数值分析。分析表明:在罕遇地震作用下黏滞阻尼器相较于低摩擦型摩擦摆具有更高的耗能效率,采用黏滞阻尼器配合低摩擦型摩擦摆组合使用较常规设计方法具有更好的减震效果,通过增大曲率半径可延长隔震结构基本周期,降低地震能量输入,同时采用黏滞阻尼器限制隔震结构罕遇地震位移,可在相同位移条件下,得到相较常规设计方法更高的结构阻尼比,可同时大幅降低上下支墩及上部结构楼层剪力。
This article introduces the conventional performance and mechanical properties of friction pendulum.Through the analysis of a new kindergarten project in Longnan district of Gansu,the design characteristics of high and low friction friction pendulum combinations in conventional friction pendulum design are proposed.On this basis,two design options are proposed:low friction friction pendulum with viscous dampers and low friction pendulum with large radius of curvature with viscous dampers.Numerical analysis is carried out by combining the results of elastic-plastic time-history analysis of rare earthquakes under multiple working conditions.The analysis shows that the viscous damper has a higher energy dissipation efficiency than the low-friction friction pendulum under rare earthquakes.The combination of viscous dampers and low-friction friction pendulums has better damping effect than the conventional design method.By increasing the radius of curvature,the basic period of the isolated structure can be extended and the seismic energy input can be reduced.On this basis,the use of viscous dampers to limit the rare seismic displacement of the isolated structure can achieve a higher damping ratio than the conventional design method under the same displacement conditions,and can significantly reduce the upper and lower piers and the superstructure floor shear force.
作者
叶烈伟
黄弘毅
李进波
杨钊
马上
佟宁
赵晓红
王彤辉
YE Liewei;HUANG Hongyi;LI Jinbo;YANG Zhao;MA Shang;TONG Ning;ZHAO Xiaohong;WANG Tonghui(Beijing Safebase New Material Co.,Ltd.,Beijing 100037,China)
出处
《建筑结构》
北大核心
2023年第S01期1061-1065,共5页
Building Structure
基金
国家重点研发计划资助(2022YFF0608901)
关键词
建筑摩擦摆
黏滞阻尼器
组合减隔震
大曲率半径
friction pendulum
viscous damper
combined vibration isolation
large radius of curvature
