钢筋混凝土系杆拱桥成桥吊杆索力确定方法对比分析研究

Comparison and Analysis of Determing Cable Forch Method of Reinforced Concrete Tied Arch Bridge

借鉴斜拉桥索力理论计算,对钢筋混凝土系杆拱桥成桥索力的实用性做对比分析,结合实际工程采用刚性支承连续梁法、零位移法、刚性吊杆法计算得出该桥梁的吊杆索力、拱肋弯矩、系梁弯矩。研究结果表明:刚性支承连续梁法确定刚性拱柔性吊杆的成桥索力时,吊杆成桥索力均匀,波动不大,不便于调索,不适合用于此类桥成桥索力计算;刚性吊杆法计算成桥索力与刚性支承连续梁法近似,系梁跨中下挠,拱脚附近吊杆索力小,其他吊杆索力均匀,不方便控制线形,不建议采用;零位移法采用未知荷载系数法计算,通过控制位移量,能得到较合理的成桥索力,同时也能控制系梁线形。

Based on the theory calculation of cable force of cable-stayed bridge,this paper makes a comparison and analysis on the practicability of the cable force of reinforced concrete tied arch bridge,and calculates the cable force,arch rib bending moment and tie girder bending moment of the bridge with rigid supporting continuous girder method,zero displacement method and rigid suspender method. The results show that when the rigid supporting continuous girder method is used to determine the cable force of the rigid arch flexible boom,the suspender bridge has uniform cable force,little fluctuation,and is not easy to tune,it is not suitable for the calculation of the rigid cable boom of this kind of bridge. The cable force calculated by the method is similar to that of the rigid supporting continuous girder method. It is a mid-to-bottom deflection of the girder span,and the suspender has a small cable force near the arch foot,and the other suspenders have a uniform cable force,it is inconvenient to control linearity and not recommended. The unknown load coefficient method is applied to the zero displacement method. By controlling the displacement,a reasonable cable force can be obtained,and the linear of the girder can also be controlled.