模拟地震振动台试验是研究地震作用下结构性能的重要试验手段,相比拟静力、拟动力试验各具优势和特色.为了验证沈阳地铁车辆段上盖双子楼结构的隔震性能,根据相似理论设计结构模型,开展了模拟地震振动台试验研究.试验表明:小比例振动台模型存在尺寸效应,但宏观破坏现象足可反映结构薄弱部位和破坏机制;结构模型在双向地震作用下主要以双子楼平动为主,扭转振动不明显;随着隔震上部结构损伤积累,在7.5度地震作用下模型结构发生显著损坏,隔震支座发生不可恢复变形,顶部机顶房柱端开裂;试验验证了隔震后的建筑可满足规范设防要求.%A simulated earthquake shaking table test is an important experiment in the study of structural performances under seismic action which has its advantage and characteristic compared with pseudo-static and pseudo dynamic tests.In order to verify the structural isolation performance of Shenyang metro depot top head two buildings,simulated earthquake shaking table tests based on the similarity theory and designed structural model were carried out.The tests show that the shaking table model in reduced scale has size effect,whereas,the model’ s macro destruction phenomenon can show the structure’ s weak parts and failure mechanism;the structural model mainly behaves as the twin towers vibrating transversely under bi-directional earthquake,while the model’ s torsional vibration is not obvious.As the damage of the top structure accumulates,it will break down under 7.5 degrees earthquake,and the isolation bearing demonstrates irrecoverable deformation,meanwhile,the pillar on the top of the roof room is cracked.The tests verifiy that the architecture installed with seismic isolation devices can meet the Specification’ s requirements.
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