装配式工业设备支架复合隔震结构振动台试验研究

Shaking table test on hybrid isolation system of prefabricated industrial equipment supports

为解决在役工业设备支架中存在的现场湿作业环境污染、专用设备加速度超限以及无真实地震响应试验模拟现状等问题,对分别采用对角布置天然橡胶-铅锌橡胶支座(linear natural rubber-lead rubber,LNR-LR)型和水平布置天然橡胶支座-黏滞阻尼器(linear natural rubber-viscous damper,LNR-VD)型复合隔震结构及采用固定组件连接的非隔震结构开展足尺振动台试验研究,通过对比远近场和人工地震波激励下复合隔震结构和非隔震结构的设备加速度峰值响应和隔震层位移响应,分析附加不同阻尼装置的整体复合隔震结构体系动力特性与振动控制效果。结果表明:与非隔震结构相比,分别采用LNR-LR型和LNR-VD型的两种复合隔震结构均可有效延长结构基本周期,在保持主体结构处于“大震弹性”状态下,设备支架最不利挂机点处水平加速度峰值严格不超过设备限值,罕遇地震作用下隔震层最大水平位移响应满足隔震位移要求(依据GB/T 51408—2021《建筑隔震设计标准》,限值为110 mm),且基本无残余位移;与LNR-LR型复合隔震结构相比,LNR-VD型复合隔震结构具有更为优异的振动控制效果,能够进一步降低上部结构水平加速度响应及隔震层水平位移响应,平均减震系数可达80.82%。

To address the issues in the application of prefabricated industrial equipment supports,including wet pollution,excessive acceleration response of critical equipment and the absence of real seismic test,a series of full-scale shaking table tests were conducted on two hybrid isolation systems(HISs)and a non-base isolation system(NBIS)of prefabricated industrial equipment supports.The two HISs incorporated a diagonal arrangement of linear natural rubber and lead rubber(LNR-LR)bearings,and a horizontal arrangement of linear natural rubber and viscous damper(LNR-VD)devices,respectively,while the NBIS incorporated temporary fixed components of itself.The dynamic characteristics and seismic performance of the two HISs with different combinations of dampers were examined by comparing the peak acceleration response of the equipment and transient displacement response of the isolation layer in the two HISs and the NBIS under far-field,near-fault and artificial ground motions.The test results demonstrate that compared with the NBIS,the two HISs,i.e.,HIS-LL and HIS-LV,can effectively elongate the fundamental period of the structure.The maximum peak horizontal acceleration response of critical equipment in the HISs can be strictly controlled below the operational limits,and the structural members remain elastic under the maximum considered earthquake(MCE).The peak transient displacement response of the HISs is satisfactory(below 110mm,according to the Chinese code GB/T 51408-2021‘Standard for seismic isolation design of building'),and the residual displacement is negligible under the MCE.Compared with the HIS-LL,the HIS-LV exhibits a preferable efficiency of seismic vibration control in simultaneously reducing the horizontal acceleration response of superstructure and horizontal displacement response of isolation layer,with the average peak acceleration reduction coefficient reaching up to 80.82%.