大跨度钢桁架系杆拱桥施工监控技术研究

以赣州市赣南大道新世纪大桥为工程背景,研究了大跨度钢桁架系杆拱桥采用悬臂拼装施工过程中的监控技术。首先,应用Midas/Civil有限元分析软件,对大跨度钢桁架系杆拱桥的施工全过程进行了模拟计算,得到了各个施工控制工况下结构构件位移、应力和支反力理论数据;其次,对结构悬臂拼装过程中关键控制截面(拱顶、L/4、拱脚)的应力以及各控制点的线形进行了监测;通过对比实测结果与理论结果之间的误差,提出控制调整措施,确保成桥线形和应力状态符合规范和设计要求。

Study on Construction Monitoring Technology of Long-span Steel Truss bowstring Arc Bridge

Taking Ganzhou City Gannan Avenue New Century Bridge as the engineering background,the article studies the monitoring technology of the long-span steel truss bowstring arch bridge used in the cantilever erection construction.The Midas/Civil finite element software is used to simulate and calculate the whole construction process of long-span steel truss bowstring arch bridge in order to achieve the theoretical data of the displacement,stress and reaction force of the structural components under the different control conditions.The stresses of the key control sections(arch top,L/4,arch foot) and the alignment of each control point are monitored in the process of structural cantilever erection.According to the errors between the measured result and the theoretical result,the article puts forward the control adjusting measures in order to ensure that the built bridge alignment and the stress state can satisfy the standards and the design requirements.