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采用大型通用有限元软件ANSYS建立中承式钢管混凝土劲性骨架拱桥——堰吉河大桥全桥有限元模型,在成桥状态下,选取10种工况进行静力学分析,并进行模态分析。为验证有限元分析的合理性,选取24个拱肋应变测点和4个挠度测点,对该桥进行成桥静载试验,并进行动载试验测试桥梁基频。通过对比分析,表明有限元分析结果与试验测试结果吻合较好,有限元模型可反映桥梁实际状态。同时试验结果表明桥梁结构强度和刚度满足设计及规范要求。
A large-scale finite element software ANSYS was used to establish the finite element model of CFST-Yanji River Bridge full-bridge. Under the condition of bridge construction, 10 kinds of conditions were selected for static analysis and modal analysis. In order to verify the rationality of the finite element analysis, 24 arch-rib strain measuring points and 4 deflection measuring points were selected. The bridge was subjected to static load test and dynamic test to test the fundamental frequency of the bridge. Through the comparative analysis, it shows that the finite element analysis results agree well with the test results, and the finite element model can reflect the actual state of the bridge. The test results show that the strength and stiffness of the bridge structure meet the design and specification requirements.