ABSTRACT

Concrete-filled steel tube (CFST) stiff skeleton concrete arch bridges can be designed with longer spans using balanced ring-casting construction. However, this construction method induces non-planar sectional stress in the arch rings. To investigate the influence of the non-planar sectional stress on the seismic performance of arch bridges, we developed two numerical models of a typical arch bridge. The first model simulates the construction process of balanced ring-casting, while the second model ignores the construction process. The dynamic analysis results reveal that, if the construction process is ignored, the seismic risks of concrete cracking and reinforcement yielding in the arch rings will be underestimated.

摘要

钢管混凝土 (CFST) 刚性骨架混凝土拱桥可以使用平衡环浇注结构设计成更长的跨度。然而，这种施工方法会在拱圈中产生非平面截面应力。为了研究非平面截面应力对拱桥抗震性能的影响，我们开发了两个典型拱桥的数值模型。第一个模型模拟了平衡环铸件的施工过程，而第二个模型忽略了施工过程。动力分析结果表明，如果忽略施工过程，将低估拱圈混凝土开裂和钢筋屈服的地震风险。