呼和浩特市三环路特大桥预应力连续梁桥悬臂施工控制研究

基于呼和浩特市三环路特大桥,对其预应力连续梁桥悬臂施工控制进行了研究。结果表明,该桥挂篮最大剪力为268.82 kN、最大轴力为625.32 kN、最大弯矩为132.85 kN。在工作状态下,挂篮各杆件变形及受力能满足规范、设计要求。通过分析仿真模型的建立及控制参数具体取值,各标高测点理论值和实测值并不完全一致,变化幅度亦不十分显著,没有显著的规律性。理论值和实测值之间保持-4~2 mm范围内的差值变化。5.54 MPa是主要测点在中跨1/4截面和主梁悬臂根部受压应力的最大值,0.43 MPa是其最大拉应力值。现场实际监测的连续梁值和理论值具有较小偏差、变化规律比较类似,在施工控制中,所建模型能客观、准确地对实际施工进行反映,监测控制点切实可靠。

Study on Cantilever Construction Control of Prestressed Continuous Girder Bridge of Huhhot Third Ring Road Bridge

Based on Huhhot Third Ring Road Bridge,the cantilever construction control of its prestressed continuous girder bridge is studied in this paper.The results show that the maximum shear force,the maximum axial force and the maximum bending moment of the hanging basket of Huhhot Third Ring Road Bridge are 268.82 kN,625.32 kN and 132.85 kN M.In the working state,the deformation and stress performance of each member of the hanging basket can meet the requirements of specifications and design.By analyzing the establishment of simulation model and the specific values of control parameters,there are some deviations between the measured and theoretical values of each elevation measuring point,and the changes are relatively stable,but there is no obvious regularity.The difference between most measured and theoretical values varies from-4mm to 2mm.In the middle span 1/4 section and the cantilever root of the main beam,the maximum compressive stress of the main measuring points is 5.54 MPa and the maximum tensile stress is 0.43 MPa.In the construction control,the model can reflect the actual construction objectively and accurately,and the monitoring control points are practical and reliable.