【摘要】 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.更多还原

【Abstract】 To study the effect of joint stiffness on seismic response of single-layer cylindrical reticulated shell,ANSYS/LS-DYNA was used to build the reticulated shell models.Two types of models were built by ’Shell163 element’ and ’Beam161 element’ respectively.The key difference between these two types of models was that the real size spherical joint could be built in the shell element model,and this shell element joint load-carrying FEA(finite element analysis) result was close to the continuum element joint model FEA result.These two types of models constituted a group to be compared with each other.By changing the structure parameters(length-width ratio,rise-span ratio and span),3 more groups were gotten.Through comparing the top-point seismic responses,the conclusion is: when the structure parameter is changed,the seismic responses of these two types of models are changed obviously different;When structure parameter is a constant,the seismic responses difference of the two types of models are changed widely.So,it is recommended to consider the joint stiffness when seismic response of this type structure is studied.更多还原