某文物展馆分离式三维隔震设计与抗震性能分析

Separated 3-D seismic isolation design and seismic performance analysis of a cultural relics exhibition hall

地震的不确定性对文物展馆与馆内文物防震安全提出了严峻挑战。三维隔震在保护文物建筑结构和减轻室内振动方面具有积极作用。首先,基于分离式三维隔震理念,提出将水平隔震层与竖向隔震层分开布置的减震设计;其次,结合某文物展馆进行了分离式三维隔震设计,并对传统结构(TRA)、水平隔震结构(HISO)、三维隔震结构(3DISO)进行了设防地震作用下的数值分析;最后,针对层加速度、层间剪力、层位移、顶层加速度及楼层反应谱等指标展开分析。结果表明,3DISO结构与HISO结构均能有效降低水平地震响应,而3DISO结构同时有助于降低上部结构竖向地震响应,竖向隔震层的设置对水平隔震后地震响应有放大趋势,紧邻竖向隔震层上部结构轴力值较TRA与HISO结构有增大效应,在工程设计时需予以考虑。

Earthquake uncertainty poses a serious challenge to the seismic safety of cultural relics exhibition halls and buildings.Threedimensional(3-D)isolation plays an active role in protecting the structure of cultural relics and reducing indoor vibration.Firstly,based on the concept of separated three-dimensional isolation,the seismic design of separating horizontal isolation layer from vertical isolation layer is proposed.Secondly,combined with a cultural relic exhibition hall,the separated three-dimensional isolation design is carried out,and the traditional structure(TRA),horizontal isolation structure(HISO)and three-dimensional isolation structure(3DISO)are protected against earthquakes.Finally,the analysis is carried out for the floor acceleration,interlayer shear force,floor displacement,top floor acceleration and floor response spectrum.The results show that both the 3DISO structure and the HISO structure can effectively reduce the horizontal seismic response,while the 3DISO structure can also help to reduce the vertical seismic response of the superstructure.The vertical isolation layer has a tendency to amplify the seismic response after horizontal isolation,and the axial force value of the superstructure adjacent to the vertical isolation layer has an increasing effect than that of the TRA and HISO structures.It should be considered in engineering design.