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为研究大跨钢-混结合梁斜拉桥内力状态规律,保证强度安全,成桥及施工节段受力特性分析是必要的。该文以西固黄河大桥为工程背景,建立大跨钢-混结合梁斜拉桥有限元模型,采用零位移法确定合理的成桥状态,并针对施工阶段主梁拼装、斜拉索张拉、桥面板安装、湿接缝浇筑、二期恒载施工过程、收缩徐变中桥梁的应力分布情况进行了分析,有关结论可为西固黄河大桥以及同类桥梁成桥及施工节段受力特性研究提供借鉴。
In order to study the internal force state law of the long-span steel-concrete composite beam-stayed bridge and ensure the strength and safety, it is necessary to analyze the stress characteristics of the bridge and the construction segment. Based on the engineering background of Xigang Yellow River Bridge, the finite element model of long-span steel-concrete composite girder cable-stayed bridge is established. The zero-displacement method is used to determine the reasonable state of bridge. According to the construction of main girder assembly, Bridge deck installation, wet joint pouring, two-stage dead load construction process, and the stress distribution of bridge during shrinkage and creep are analyzed, and the conclusions can provide reference for the study of the stress characteristics of Xigou Yellow River Bridge and similar bridges in construction and completion .