某双曲拱桥加固前后承载能力评估

Evaluation of Bearing Capacity for Hollow Double Curvature ArchBridge Before and After Reinforcement

以甘肃路网中一跨30 m现役空腹式双曲拱桥为工程背景,根据其结构特点,采用实体单元模型,利用大型通用有限元结构分析软件Ansys对该桥原位移场、应力场及力学行为进行空间有限元模拟分析,进而采取有效的方法对其进行加固处理,经模拟分析,该桥加固后其承载能力及刚度明显提高,有效地降低了桥跨结构的位移与应力,改善了桥跨结构的整体受力性能,加固效果良好。

Choosing a hollow double curvature arch bridge with one span （30 m） in the highway network of GanSu and according to its structure characteristics, the finite element analysis program （ANSYS） is adopted to analyze the mechanical behavior, regulation of displacement and stress of the whole bridge in which 3-dimension- al solid elements are used before reinforcement, so as to provide accurate data for adopting effective reinforcement method. Simulating analysis shows that, after reinforcement, the bearing capacity and stiffness are effectively raised, the displacement and stress reduced, and mechanical behavior of the bridge improved, therefore the reinforcement is practicable.