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为了解决钢管拱桥施工中的钢箱梁落梁问题,建立了梁-拱-索三控方法的优化模型,以主拱圈和主梁的线形状态以及吊杆索力三者与设计值相对误差之和为目标函数,钢箱梁顶升高度为设计变量,在施工阶段采用坐标轮换法和抛物线法进行求解,基于落梁法施工原理,以越南钢管拱桥-龙桥为工程实例,采用梁-拱-索三控方法对其落梁法施工控制进行优化研究,结果表明:主拱圈和钢箱梁的线形、应力的实测值与理论值变化趋势一致,主拱圈和钢箱梁的位移最大误差分别为18mm和23mm,最大应力分别为-127.60 MPa和-33.39 MPa,吊杆力误差均在10%以内,吊索索力分布均匀合理,采用梁-拱-索三控法优化后落梁法施工的钢管拱桥成桥内力、线形和索力具有较高的精度,满足规范要求,能够很好地应用在钢管拱桥施工中,可为同类型桥梁的高效施工提供借鉴和参考。
In order to solve the problem of the steel box girder falling off during the construction of the steel tube arch bridge, an optimization model of the beam-arch-cable three-control method is established. The relative error between the linear state of the main arch ring and the main girder and the cable force of the boom and the designed value Based on the construction principle of the falling beam method and taking the steel tube arch bridge in Vietnam as the example of Longqiao Bridge, the beam-arch-bridge method is adopted as the objective function. The lifting height of the steel box girder is the design variable. Suo San control method to optimize the construction control of the falling beam method, the results show that: the main arch ring and the steel box girder linear, the measured value of the actual value and the theoretical trend of change, the main arch ring and steel box girder maximum displacement error Respectively, 18mm and 23mm, the maximum stress of -127.60 MPa and -33.39 MPa, respectively. The error of the suspender force is within 10%, the cable force distribution of the sling is uniform and reasonable, and the beam-arch-cable tri- Of the steel pipe arch bridge into the internal force, linear and cable with high accuracy to meet the regulatory requirements, can be well used in the construction of steel pipe arch bridge, for the same type of bridge efficient construction and provide reference.