考虑施工阶段的高铁系杆拱桥吊杆张拉优化研究  

Study on optimization of suspender tension of a high-speed railway tied-arch bridge considering construction stage

作　　者：王祥国 邓博 杨孟刚[2] WANG Xiangguo;DENG Bo;YANG Menggang(China State Railway Investment Construction Group Co.,Ltd,Beijing 110020,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中建铁路投资建设集团有限公司,北京100053 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2020年第4期808-814,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金面上资助项目(51978667)。

摘　　要：将影响矩阵法引入系杆拱桥,建立以优化前后吊杆成桥索力差值向量二范数平方的最小值为目标函数,以吊杆张拉力为变量,以各个施工及成桥阶段中系梁和拱肋的挠度、应力以及吊杆索力作为约束条件的优化模型,通过该优化模型的计算来减少施工阶段的吊杆张拉次数。基于该优化模型,以新建某高铁线144 m下承式尼尔森体系简支拱桥为工程实例,获得施工阶段1次张拉的吊杆张拉力。研究结果表明:优化后采用吊杆1次张拉方案的系梁和拱肋的挠度、内力与设计状态较接近,验证了该优化模型的可靠性和有效性。该优化方法可为同类型桥梁的设计和施工提供参考。Aimed to decrease the time of suspender tension by performing optimization research considering construction,the influence matrix method is drawn into to establish the optimization model in which the two-norm square minimum value of the cable force difference before and after optimization is considered as the objective function,the tensile force as a variable,the cable force as well as the deflection and stress of the beam and arch rib as the constraint condition.Based on the optimization model,taking a high-speed railway simply supported tied-arch bridge with the span of 144 meters for high-speed railway as an example,the tensile forces of the suspenders are obtained with the proposed optimization model ensuring that each suspender only needs to be stretched once.The result shows that the deflections and internal forces of the beam and arch rib stretched once are close to the design state,which verifies the reliability and validity of the optimization model and can provide a reference for design and construction of bridges with similar structures.

关 键 词：系杆拱桥 吊杆张拉 优化模型 施工阶段 影响矩阵 

分 类 号：U24[交通运输工程—道路与铁道工程]