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以某典型单层多跨无梁楼盖人防结构为研究对象,根据相似条件设计了场地土和结构模型,分别采用Elcentro波和Kobe波进行水平单向或双向耦合地震动输入,进行两种不同埋深情况下砂土地基中结构地震响应的振动台模型试验研究。给出了结构加速度、应变、位移等动力响应的量测结果,分析了无梁楼盖人防结构地震破坏机理。结果表明:双向耦合输入地震荷载比水平单向输入地震荷载引起的结构动力响应大;浅埋结构与深埋结构相比各种动力响应均明显增大;由于结构中柱相对独立,其动力反应较侧墙强烈;结构中柱上下端、侧墙上下角隅处都是容易遭受地震破坏的部位;竖向地震力对结构的动力响应产生明显影响,其破坏力不容忽视。
Taking a typical single-storey multi-span civil air defense structure with no span as a research object, the site soil and structural model are designed according to similar conditions. The horizontal and one-way or two-way coupled ground motions are input by Elcentro wave and Kobe wave separately. Shaking Table Model Test Study on Earthquake Response of Sand Soil Foundation under Deep Foundation. The measurement results of dynamic responses such as acceleration, strain and displacement are given. The earthquake damage mechanism of the civil air defense structure with no beam is analyzed. The results show that the dynamic response of the two-way coupled input seismic loads is larger than that of the one-way input seismic loads. The dynamic response of shallow buried structures is obviously larger than that of the deep buried structures. Due to the relatively independent central column, the dynamic response Which is stronger than the side wall. The upper and lower ends of the column and the upper and lower corners of the side wall are prone to earthquake damage. The vertical seismic force has a significant effect on the dynamic response of the structure, and its destructive force can not be ignored.