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基于通用有限元软件ANSYS及自编的前后处理程序,有计划地针对400余例单层双曲椭圆抛物面网壳结构进行双重非线性全过程分析,系统地考察了屈曲模态、塑性发展分布等特征响应,总结初始缺陷和荷载不对称分布以及考虑材料非线性等因素对网壳弹塑性稳定承载力的影响规律,对现有网壳规程中安全系数取值进行重新核定。结果表明:双曲扁网壳屈曲模态通常表现为局部结点的跳跃失稳,并主要发生在网壳角部支座或边缘跨中位置;有缺陷双曲扁网壳的极限承载力可按完整结构的74%取值,并且此类结构对于荷载不对称分布不敏感;同时建议双曲扁网壳稳定性验算中安全系数的取值应根据不同结构形式和几何参数确定,取值范围为4.67~5.16。
Based on the general finite element software ANSYS and self-prepared preprocessing program, the double nonlinear full-process analysis of more than 400 single-layer hyperbolic elliptic paraboloid reticulated shell shells was systematically investigated, and the distributions of buckling mode and plasticity were investigated systematically Characteristic response, summarizes the initial defects and asymmetric distribution of load, and considers the influence of material nonlinearity on the elasto-plastic stable bearing capacity of reticulated shell, and re-verifies the value of safety factor in reticulated shell. The results show that the buckling mode of hyperbolic flat-shelled-net latticed shell usually shows the jump instability of local nodes, which mainly occurs at the corner support or the mid-span of the shell. The ultimate bearing capacity of the hyperbolic flat reticulated shell According to the value of 74% of the complete structure, and such structures are insensitive to the asymmetric distribution of loads; meanwhile, the safety coefficient of double-decker Flat Reticulated Reticulated Shell should be determined according to different structural forms and geometrical parameters, 4.67 ~ 5.16.