地下空间结构对邻近地上结构地震反应影响振动台实验

SHAKING TABLE TEST ON THE INFLUENCE OF UNDERGROUND SPACE STRUCTURE ON THE SEISMIC RESPONSE OF ADJACENT SUPERSTRUCTURE

  • 摘要: 大型地下空间结构影响地震波的传播使邻近地震动场发生变化。为研究地上结构地震响应受地下空间结构的影响程度,设计并开展了地下结构-土-地上结构体系(SSSI)和土-地上结构体系(SSI)振动台模型实验,对比研究了在6条不同卓越频率输入地震波下地上结构地震反应的变化规律。实验研究结果表明:地下空间结构影响邻近场地的动力特性,进而影响邻近结构的动力特性,导致SSSI体系的地上结构频率和场地基频均小于SSI体系。地下空间结构使运动相互作用增强而导致SSSI体系的箱基摇摆运动显著大于SSI体系。箱基的平动加速度、摇摆加速度和结构变形加速度分量的峰值并不同步。SSSI体系的结构变形反应最大可达到SSI体系变形反应的1.267倍。

     

    Abstract: The large underground space structure affects the propagation of seismic wave and changes the adjacent seismic field. In order to study the influence of underground space structure on seismic response of superstructures, the shaking table tests on the underground structure-soil-surface structure (SSSI) system and the soil-surface structure (SSI) system were designed and carried out. The seismic responses of the superstructure under six different dominant frequency input seismic waves were comparatively studied. The results show that the underground space structure affects the dynamic characteristics of adjacent sites, and then affects the dynamic characteristics of adjacent structures. As a result, the ground structure frequency and site fundamental frequency of SSSI system are less than those of SSI system. The underground space structure enhances the motion interaction, which leads to the rocking motion of SSSI system being larger than that of SSI system. The peak values of translational acceleration, rocking acceleration and structural deformation acceleration of SSSI system are not synchronous. The maximum deformation response of SSSI system is 1.267 times of that of SSI system.

     

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