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基于子结构有限元模型修正技术,借助通用有限元计算程序,通过对四渡河大跨度悬索桥结构进行敏感参数分析,确定受力敏感参数,分别建立有限元模型修正应变及频率目标函数,采用动静力法对离散后的索塔、主缆等子结构模型进行修正,通过对比分析实桥应变、频率及挠度的实测值与理论值,验证了修正效果的有效性。研究过程发现:大跨度悬索桥结构的受力特性主要取决于主缆,主缆的计算参数取值对计算结果有着重大影响;而吊索、索塔及加劲梁等相比显得并不十分敏感;基于参数分析子结构有限元模型修正过程是先总后分再总,修正过程快捷迅速,其有效性在实桥中得到了很好的验证,修正后的模型可用作后续计算研究的基准模型。
Based on the finite element model modification technology of sub-structure and the finite element program, the sensitive parameter analysis of the structure of the long-span suspension bridge of Siduhe River was carried out to determine the stress-sensitive parameters. The finite element model was established to correct the strain and frequency objective function respectively. This paper modifies the discrete substructure model such as pylon and main cable, and verifies the effectiveness of the correction by comparing the measured and theoretical values of strain, frequency and deflection of the bridge. The research found that the stress characteristics of the long-span suspension bridge structure mainly depend on the main cable, the calculation parameters of the main cable have a significant impact on the calculation results, while the sling, tower and stiffener are not very sensitive; Based on the parametric analysis, the finite element model of the sub-structure is modified first and then after the total points, the correction process is fast and quick, and its validity is well verified in the real bridge. The revised model can be used as a benchmark model for subsequent calculation .