唐山某中学超长隔震教学楼设缝方案比较

Comparison of expansion joint scheme of a middle school extra-long isolated teaching building in Tangshan

唐山某中学教学楼地上五层,无地下室,结构总高度19.3m,长140.3m,宽21m,高宽比0.92,长宽比6.68,为钢筋混凝土框架结构,采用铅芯橡胶支座进行基础隔震。通过PKPM软件和SAUSG-PI软件对结构进行隔震分析,比较了结构不设缝和隔震层以上设两道伸缩缝的隔震性能。结果表明,在隔震支座布置相同的条件下,结构不设缝时的各项隔震性能指标均满足规范的要求,隔震层以上结构设伸缩缝后,罕遇地震作用下隔震支座的最大水平位移超出规范限值。超长建筑隔震设计时尽量不设伸缩缝,结构设缝会加大地震响应的复杂性,不利于隔震设计。

The teaching building of a middle school in Tangshan has five floors above ground and no basement.The total height of the structure is 19.3m,the length is 140.3m,the width is 21m,the ratio of height to width is 0.92,and the ratio of length to width is 6.68.It is a reinforced-concrete frame structure.Lead rubber bearing is used for seismic isolation.By using PKPM software and SAUSG-PI software,the seismic isolation performance of the structure with no joint and two expansion joints above the isolation layer is compared.The results show that under the same isolation bearing arrangement,all the isolation performance indexes of the structure without joint meet the requirements of the code,and the maximum horizontal displacement of the isolation bearing under the action of rare earthquakes exceeds the limit of the code if the structure with expansion joints above the isolation layer.During the seismic isolation design of extra-long buildings,no expansion joint should be set.The expansion joint will increase the complexity of seismic response,which is not conducive to the seismic isolation design.