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目前进行斜拉索更换施工时,一般都要求在不中断交通的情况下进行施工组织设计,为了确保施工过程中桥跨结构安全,合理的交通限制措施至关重要。该文以长沙湘江银盆岭大桥换索施工为工程背景,分析了设计车队在静态布载和动态行驶情况下对桥跨结构的作用效应。指出在斜拉索卸除的情况下,不进行交通限制难以保证桥跨结构受力安全,而考虑设计冲击系数的车队作用的静态分析结果可能会小于动力分析结果;因此,施工组织设计中需要根据具体桥梁情况选择适用的汽车车队,利用可靠的分析方法,确定合理的交通限制措施。
In the current construction of cable stayed cable replacement, the construction organization design is generally required without interruption of traffic. In order to ensure the safety of the bridge span during construction, reasonable traffic restriction measures are of utmost importance. In this paper, the replacement construction of Yinpenling Bridge in Xiangjiang River in Changsha is taken as the engineering background, and the effect of the design fleet on the bridge span structure under static loading and dynamic driving is analyzed. It is pointed out that it is difficult to ensure the safety of the bridge structure without traffic restrictions when the cable stay is removed. However, the static analysis results of the fleet considering the design impact coefficient may be less than the dynamic analysis results. Therefore, According to the specific circumstances of the bridge to select the appropriate vehicle fleet, the use of reliable analytical methods to determine reasonable traffic restrictions.