基于性能的单层球面网壳结构强震损伤模式优化
Performance-Based Damage Mode Optimization for Single-Layer Latticed Spherical Shell Under Strong Earthquake Excitations

为避免强震作用下单层网壳损伤集中模式对结构整体稳定性的不利影响, 根据地震作用下网壳稳定承载力和整体损伤的变化过程, 定义了两个抗震性能指标作为目标函数, 并以杆件截面尺寸为优化变量, 采用ABAQUS软件对单层球面网壳结构的强震损伤模式进行了多目标优化, 并对优化前后结构的动力响应和损伤演化进行分析．结果表明：考虑杆件重要性系数的单层网壳整体损伤指标能够有效识别强震作用下单层网壳结构损伤模式, 经过优化后的单层网壳结构损伤集中模式得到有效控制, 不同位置的杆件损伤分布更加均匀．本文的优化方法能够明显提高不同强震作用下网壳结构的剩余稳定承载力．
To avoid the damage concentration mode of single-layer latticed spherical shell under strong earthquake excitations，two performance indices，i.e. overall stability index and global damage index，were proposed in this paper. Through defining the two performance indices as the objective function and section dimension of members as optimization variable，the performance-based damage mode multi-objective optimization method was developed. A numerical example of a single-layer latticed spherical shell subjected to various earthquakes was optimized based on ABAQUS. Besides，the damage modes and dynamic responses of the shell were analyzed before and after optimization. The analysis results indicate that the damage mode of the shell under strong earthquakes can be effectively identified by using the proposed global damage index which considers member importance factors. The damage concentration mode is effectively prevented and the member damage distribution is more uniform than that of initial shell. The residual stability capacity of the damaged shell can be obviously improved by the proposed optimization method