壳单元单层网壳模型的损伤本构模型研究  

Study on damage constitutive model used in the fine reticulated shell model

作　　者：王宁[1] 薛素铎[2,3] 李雄彦[2,3] 

机构地区：[1]河北联合大学建筑工程学院,河北唐山063009 [2]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 [3]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：《空间结构》2014年第2期15-22,63,共9页Spatial Structures

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

摘　　要：采用壳单元建立网壳结构的精细化模型时,模型中的壳单元在两个方向均有正应变,因此在双向都会出现损伤.为满足结构失效分析时考虑损伤累积的需要,建立了适合壳单元的双向损伤本构模型,通过与常用的梁单元杆件损伤分析结果对比,验证了新建损伤模型的合理性.最后给出了一个单层柱面网壳模型的算例,由分析结果可知,由于损伤累积的影响,模型的失稳时间明显提前了.The members of hollow spherical joints and tubes in the fine reticulated shell model are built by shell elements which have two direct strains in the constitutive model. Therefore the damage accumulation happens in these two directions. The previous single-direction damage model can＇t be used directly. In order to meet the need of the research, an appropriate bidirection damage constitutive model is built for shell element based on the previous damage variable model. The new model is fit for shell element and can meet the request of precision by comparing the FEA （finite element analysis） results with those from beam element tube. A single-layer cylindrical reticulated shell under strong earthquake excitation is analyzed. The result which takes the damage accumulation into consideration shows the structural instability is happened earlier than that of ignoring damage accumulation.

关 键 词：损伤累积 壳单元 空心球节点 单层网壳 

分 类 号：TU393.3[建筑科学—结构工程]