单层柱面网壳强震失效分析中考虑节点刚度影响的简化模型研究  

Simplified model of single-layer cylindrical reticulated shell considering the effect of joint stiffness in failure analysis under strong earthquake

作　　者：薛素铎[1,2] 王宁[1,2] 李雄彦[1,2] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《振动与冲击》2013年第16期106-111,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金重大研究计划项目(90715034);国家自然科学基金(51078010);北京市自然科学基金(8112005)

摘　　要：在进行单层柱面网壳强震失效分析时,采用能考虑球节点轴向刚度和弯曲刚度耦合的壳单元精细化模型固然好,但是壳单元模型的单元数目太多,相对于梁单元常用模型的计算量是非常大的。然而,常用模型由于不考虑节点刚度的影响,强震下地震响应分析的结果误差又较大。因此,在常用网壳模型的基础上建立了能等效精细化网壳模型的相对简化模型,此模型在节点区域用梁单元代替空心球节点,通过减小节点区杆件的刚度,可以明显改善模型的分析精度,而且采用模型后计算量增加不大,所以此模型更适合进行此类结构的强震失稳分析。The coupling between axial and bending stiffness of hollow spherical joint should be considered in the dynamic failure analysis of shell element model in order to obtain more accurate results than the commonly used beam element model.However,this shell element model,which considers the coupling effect of joint,can’t be used in simulation generally,because in the case of huge quantity of complicated shell elements,much more time consuming will be needed in computation than the common model.On the other hand,the commonly used beam element model needs fewer elements,but the error of results will become obvious in dynamic analysis.Accordingly,a new relatively simplified model,which considers the effect of joint stiffness by using beam element in the spherical joint zone,was put forward.The precision of simulation can be improved clearly by using low stiffness tube elements in the joint zone,and the computing time does not increase too much.The model is fit for the dynamic stability analysis of such structures.

关 键 词：单层柱面网壳 节点刚度 动力稳定性 

分 类 号：TU393.3[建筑科学—结构工程] TU311.4