基于摩擦摆支座连接的大跨连体结构分析——以单、多点激励下的地震反应为例

Analysis of long-span connected structure based on friction pendulum bearing connection:Take the seismic response under single and multi-point excitation as an example

多点激励下的地震反应分析是大跨度空间结构计算分析的重要组成部分,为大跨度空间结构设计提供重要的科学依据。对最大跨度为76.5 m、总长约为580 m的大跨连体结构进行单、多点激励下的小震弹性时程分析,研究了基于摩擦摆支座连接的大跨连体结构在行波效应下的地震反应。结果表明:支撑塔楼在单点激励下的楼层剪力及最大层间位移角均小于多点激励下的相应值;单点激励下摩擦摆支座的内力及变形均大于多点激励下的相应值;不同激励方式对大跨度连体桁架在地震单工况下的受力影响较大。

The seismic response analysis under multi-point excitation is an important part of the calculation and analysis of long-span spatial structures,which can provide an important scientific basis for the design of long-span spatial structures.For the long-span connected structure with a maximum span of 76.5 m and a total length of about 580 m,the small earthquake elastic time history analysis under single and multi-point excitations is carried out,and the seismic response of the long-span connected structure connected by friction pendulum bearings under traveling wave effect is studied.The results show that the floor shear force and the maximum interstory drift ratio of the supporting tower under single point excitation are less than the corresponding values under multi-point excitation;the internal force and deformation of friction pendulum bearing under single point excitation are greater than those under multi-point excitation;different excitation modes have great influence on the stress of long-span connected truss under single seismic condition.