材料损伤累积在网壳强震失效研究中的应用

为在网壳结构强震分析中考虑材料损伤累积及裂纹效应的影响,编制了通用有限元软件ABAQUS的用户材料子程序,通过标准子程序验证表明具有较高的计算精度.应用该程序对网壳结构在地震下的典型算例进行了对比分析,表明子程序具有较好的收敛性能,实现了考虑钢材损伤累积的有限元分析方法.应用该程序,并结合基于响应的动力全过程分析方法,对网壳结构在强震下的响应进行了参数研究,考察了结构失效时刻的特征响应.通过是否考虑材料损伤累积的对比表明,考虑这个因素对失效时刻的塑性发展影响不大,但可能明显降低结构的失效极限荷载,需要在分析中予以重视.

Application of material damage cumulation in reticulated shells under severe earthquakes

The user material subroutine of ABAQUS was compiled to consider the influence of material damage cumulation and crack effect in analyses of reticulated shells under severe earthquakes.The calculating precision was proved by standard test on the subroutine.The comparison of typical examples of reticulated shells subjected to earthquake motions was carried out by applying the user subroutine,which showed the excellent convergence performance,and the finite-element analyzing method with the consideration of damage cumulation was achieved.Using this subroutine,responses of reticulated shells with different parameters under severe earthquakes were studied and characteristic responses at the structural failure time were discussed as well.The comparison, with and without consideration of damage cumulation,indicates that considering this factor has little influence on the plastic development at the failure time,however,it decreases the structural failure limit load obviously,which needs the recognition in the analysis.