Design for redundancy maximization of steel bridges based on nonlinear multiscale analysis

为了保证钢桁梁桥的冗余度，在目标桥梁的完整和损坏的情况下，对节点所需的性能进行了检查。结果表明，为了提高完整桥梁的冗余度，不仅要考虑斜拉构件的轴力，还要考虑楼板梁对节点板的影响。同时也可以看出，提高损伤桥梁的面内抗弯承载力对提高损伤桥梁的冗余度是有效的。此外，为了减少非线性有限元分析的计算量，提出了一种利用节点板单元网格细化后的全局模型结果进行缩放分析的混合缩放方法。

In order to ensure the redundancy of steel truss bridges, the performance required for joints is examined in the cases of intact and damaged conditions of a target bridge. As a result, it can be concluded that, for the improvement of the redundancy of the intact bridge, not only the axial force of the diagonal member but also the effect of the floor beams on the gusset plates should be considered. It can also be remarked that the increase of the in-plane bending capacity is effective for the improvement of the redundancy of the damaged bridge. Moreover, hybrid zooming method, which is a zooming analysis utilizes the result of the global model with refined mesh by plate elements for joints, is proposed in order to reduce the computational cost of nonlinear finite element analysis.