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在顶推施工中,由于解联部位受力的暂时性和临时性,在不利荷载作用下易达到极限状态。为探讨其在施工过程中的安全可靠度,该文以湘阴大桥的顶推施工为背景,分析了解联部位的结构特点和受力特点,运用结构力学方法建立该截面的可靠分析模型,进行了可靠模型的分析计算,得出该模型的可靠指标符合规范安全要求,并对设计参数和变量的敏感度进行了分析,揭示了混凝土抗压强度不定性参数对可靠度的影响比较突出。
In jacking construction, due to the solution of the temporary force of the site and temporary force, under the adverse load easily reached the limit state. In order to discuss its safety and reliability in the construction process, this paper takes the construction of XiangYin Bridge as the background, analyzes the structural characteristics and stress characteristics of the joint area, establishes the reliable analysis model of the section by using the method of structural mechanics, Based on the analysis and calculation of the reliable model, the reliability index of the model is found to meet the safety requirements of the specification, and the sensitivity of the design parameters and variables is analyzed. It is revealed that the influence of the indefinite compressive strength of concrete on the reliability is prominent.