基底悬摆隔震结构振动台试验研究

Shaking table tests for base-suspended pendulum isolation structures

基底悬摆隔震(Base-suspended Pendulum Isolation, BSPI)结构通过设置在基底处的吊杆来悬挂整体结构,隔离地震作用,减小结构地震响应。为了解BSPI结构的抗震性能,设计和制作了等效BSPI结构模型,分别进行了水平单向和三维的振动台试验。试验设计内容包括等效结构试验模型、减震弹簧及耗能阻尼器的参数、试验工况、测点布置以及地震波选取。试验结果表明,BSPI结构在设防地震和罕遇地震下具有良好的隔震效果,阻尼器对结构位移和加速度响应控制效果明显,同时布置的竖向隔震措施对水平向地震响应影响较小。最后,采用有限元软件对BSPI结构进行地震响应数值模拟,模拟结果与试验结果吻合很好。

The base-suspended pendulum isolation (BSPI) structure can isolate seismic action and reduce structural seismic response through hanging the whole structure with hanger rods set at the base.To study the aseismic performance of BSPI structure,an equivalent scaled BSPI structure model was designed and fabricated.Shaking table tests in horizontal single direction and in 3-D ones were conducted for this model,respectively.Testing design included parameters of equivalent BSPI structure model,vibration-reducing springs and dampers,test working conditions,measured points positioning and selection of exciting earthquake waves.The test results indicated that the BSPI structure has a good isolation effect under fortification and rare earthquakes;its dampers have obvious control effect on the structure’s displacement and acceleration responses;the vertical isolation measures have little effects on the structure’s horizontal seismic response.Finally,the numerical simulation was done for seismic responses of the BSPI structure.It was shown that the simulation results agree well with the test ones.