钢管混凝土拱桥成桥及施工阶段索力优化研究

Research on Optimization of Cable Force of CFST Arch Bridge During Completion and Construction

为确定钢管混凝土拱桥合理成桥索力和施工阶段张拉力的优化方法,以实际工程为背景,通过借助有限元软件Midas Civli和数值分析软件Matlab,并利用最小弯曲能量法初步求解钢管混凝土拱桥的成桥索力,再通过影响矩阵原理对拱桥内力进行调整,进而求解最终成桥索力。对施工阶段索力则是采取正装迭代法,并结合施工阶段的影响矩阵,进而求解施工过程中各吊杆的索力。最后,通过观察成桥索力下拱桥内力、线形是否符合要求,从而确定该方法的可行性。

In order to study the method of cable force optimization of concrete-filled steel tube arch bridge,this article takes the actual project as the background and uses finite element software Midas Civli and numerical analysis soft⁃ware Matlab to solve the cable force of concrete-filled steel tube arch bridge.In this paper,at first,the minimum bend⁃ing energy method is used to solve the bridge cable force and then the internal force of the arch bridge is adjusted by the influence matrix principle to solve the final cable force.In the construction stage,the cable force of each boom is solved by means of the formal installation iteration with the influence matrix of the construction stage.Finally,the fea⁃sibility of the method is determined by observing whether the internal force and line shape of the arch bridge meet the requirements.