基于运用摩擦摆隔震支座框架结构隔震分析  

Isolation analysis of frame structure based on frictional pendulum isolation bearings

作　　者：魏大伟 陈忠 雷远德 张建斌 何小东 Wei Da-wei;Chen Zhong;Lei Yuan-de;Zhang Jian-bin;He Xiao-dong(Gansu Urban and Rural Planning and Design Institute Co.Ltd,Lanzhou 730070,China;China Institute of Building Standard Design and Research Co.Limited,Beijing 100048,China)

机构地区：[1]甘肃省城乡规划设计研究院有限公司,甘肃兰州730070 [2]中国建筑标准设计研究院有限公司,北京100048

出　　处：《工程抗震与加固改造》2023年第4期58-66,共9页Earthquake Resistant Engineering and Retrofitting

摘　　要：摩擦摆隔震支座是一种通过球面摆动,延长结构振动周期,利用滑动界面摩擦消耗地震能量,从而实现隔震功能的支座,其特点是性能相对稳定、耐久性较好、承载力大且大变形下无损伤。本文通过兰州某养老院框架结构运用摩擦摆隔震支座的计算分析与设计,利用ETABS对非隔震结构和隔震结构的自振周期、底部剪力进行了对比分析,并按照新隔震规范的要求,对该结构进行了隔震下的性能化设计。分析结果表明:隔震结构相对非隔震结构,其自振周期延长3.40倍,有效地避开场地特征周期;隔震结构底部剪力比为0.36,较大幅度地减小了上部结构的地震作用,且剪力比小于0.5,上部结构可按本地区设防烈度降低1度确定抗震措施;隔震支座长期面压均未超过乙类建筑的要求(25MPa),隔震支座未出现提离,极值最大压力未超过50MPa,满足设计要求。Friction pendulum isolation bearing is a kind of bearing,which can realize isolation function.It extends the vibration period of the structure through spherical oscillation,and uses the friction of sliding interface to consume seismic energy.The bearing is characterized by relatively stable performance,good durability,large bearing capacity and no damage under large deformation.Based on the calculation analysis and design of a nursing home frame structure in Lanzhou using friction pendulum isolation bearings,the natural vibration period and bottom shear force of non isolated structure and isolated structure are compared and analyzed by ETABS.According to the requirements of the new isolation code,the performance-based design of the structure under isolation is carried out.The analysis results show that compared with the non-isolated structure,the vibration period of the isolated structure is extended by 3.40 times,effectively avoiding the site characteristic period.The bottom shear ratio of the isolated structure is 0.36,which greatly reduces the seismic action of the superstructure.And the shear ratio is less than 0.5,the seismic measures of the superstructure can be determined according to the reduction of the local fortification intensity by 1 degree.The long-term surface pressure of isolation bearings does not exceed the requirements of Class B buildings(25MPa),and the isolation bearings do not lift.And the maximum pressure of the isolation bearing does not exceed 50MPa,which meets the design requirements.

关 键 词：摩擦摆 隔震结构 消耗地震能量 耐久性 剪力比 

分 类 号：TU352.12[建筑科学—结构工程]