重庆粉房湾长江大桥施工监控计算

Calculation of Construction Monitoring and Control of Fenfangwan Changjiang Bridge in Chongqing

为了对重庆粉房湾长江大桥进行施工监控,使该桥成桥线形及内力达到设计要求,采用MIDAS Civil有限元软件对该桥结构进行三维建模分析,计算施工过程中结构的内力及变形,并确定斜拉索的初张拉力及成桥索力。计算结果表明:施工过程中结构线形及内力均满足规范要求,成桥状态满足设计要求;短悬臂状态下以索力控制为主,长悬臂及合龙后以线形为主要控制因素;双悬臂施工时严禁单侧起吊主梁。

To carry out the construction monitoring and control of Fenfangwan Changjiang River Bridge in Chongqing and to make sure that the geometric shape and internal forces of the completed bridge of the bridge could meet the design requirements, the there-dimensional model for the structure was established by the finite element software MIDAS Civil and the structure was analyzed. The internal forces and deformation of the structure in the construction process were calculated and the initial tensioning forces of the stay cables and the cable forces of the com- pleted bridge were determined. The results of the calculation show that the geometric shape and internal forces of the bridge in the construction process can meet the relevant requirements in the codes and the state of the completed bridge can meet the design requirements. In the state of short cantilever of the bridge, the cable forces should be mainly controlled while in the state of long cantilever and closure, the geometric shape should be mainly controlled and under the condi- tion of the two-side cantilever construction, the lifting of the main girder blocks on one side should be strictly forbidden.