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以武汉二七长江大桥为工程背景,采用杆、板(壳)及空间梁单元相结合,建立了三塔结合梁斜拉桥的双主梁空间非线性有限元模型,考虑拉索垂度效应、结构大位移和梁柱效应,分析了三塔结合梁斜拉桥成桥阶段的几何非线性行为,研究了各种非线性因素对三塔结合梁斜拉桥成桥时内力的影响。结果表明,几何非线性对三塔结合梁斜拉桥不同构件受力的影响程度不同,综合非线性效应较单项计入非线性因素对于结构的影响要大。对主梁挠度的影响为4.3%。该双主梁模型自由度少,计算方便,可用于大跨径结合梁斜拉桥非线性分析。
Taking the Wuhan Erqi Changjiang River Bridge as the engineering background, the nonlinear finite element model of the double girder of the three-tower combined bridge cable-stayed bridge is established by combining the elements of the bar, the slab (shell) and the space beam. Considering the sag effect , Large displacement of structure and beam-column effect, the geometric nonlinear behavior of the three-tower combined-cable-stayed bridge at the bridge-forming stage is analyzed and the influence of various nonlinear factors on the internal force of the three-tower combined-cable-stayed bridge is studied. The results show that the influence of geometrical nonlinearity on the stress of different members of the three-tower combined cable-stayed bridge is different. The comprehensive nonlinear effect has a greater influence on the structure than the non-linear factor. Impact on the girder deflection is 4.3%. The double girder model has less freedom and is easy to calculate. It can be used for the nonlinear analysis of long-span combined cable-stayed bridges.