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本文以广东省一座下承式钢管混凝土系杆拱桥为工程依托,建立了桥梁总体有限元模型,分析了桥梁损伤后和加固后主要构件的力学特性,再结合桥梁实际状态和仿真分析结果进行安全性评估。研究中,计算拱肋时考虑了混凝土脱空、钢管混凝土套箍效应对承载能力的影响;采用频率法进行了吊杆索力测试,实测索力考虑了标定修正系数,进行了实测索力与理论计算索力的对比分析;建立了拱脚、钢锚箱局部三维实体模型,通过局部仿真分析准确地掌握了该部分的力学特性。本文研究成果对同类桥梁安全性评估有一定的参考意义。
Based on the project of a CFST tied arch bridge in Guangdong Province, this paper established the overall finite element model of the bridge, analyzed the mechanical characteristics of the main components of the bridge after damage and reinforcement, combined with the actual status of the bridge and the results of simulation analysis Sexual assessment. In the research, the influence of concrete voidage and ferrule of concrete-filled steel tube on bearing capacity was taken into account when calculating arch rib. The cable force test was carried out by frequency method. The measured cable force considered the calibration correction coefficient, Theoretical analysis of the cable force of the comparative analysis; established arch foot, steel anchor box local three-dimensional solid model, through local simulation analysis accurately grasp the mechanical properties of the part. The research results in this paper have some reference significance for the safety assessment of similar bridges.