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单层柱面网壳2类模型的地震响应比较分析

Keywords: 单层柱面网壳,精细化模型,节点刚度,地震响应

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Abstract:

为了研究单层柱面网壳节点刚度对结构地震响应的影响,应用有限元软件ANSYS/LS-DYNA中的壳单元Shell163和梁单元Beam161分别建立了2类相同尺寸的网壳模型.2类模型的主要区别是:壳单元模型中可以按构件的实际尺寸建立空心球节点,并且壳单元节点模型的承载力值与实体单元节点模型值接近.通过改变结构参数,比较了矢跨比、长宽比和跨度变化时同类模型间的响应变化,以及同一结构参数下2类模型的地震响应差值.结果表明:结构参数变化时,2类模型的响应变化幅度存在明显差异;同一结构参数下,2类模型的响应差值变化较大,在进行此类结构地震响应分析时应考虑球节点的刚度影响.

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