空间三索面斜吊杆非对称系杆钢拱桥合理成桥索力优化

Optimization of Rational Cable Forces in Complete State of Asymmetric Bowstring Steel Arch Bridge with Spatial Three Planes of Inclined Hangers

异型拱桥结构复杂,常规的索力计算理论在应用时有一定的局限性。为了研究异型拱桥成桥索力,以某座157 m下承式空间三索面斜吊杆非对称系杆钢拱桥为背景,根据刚性支承连续梁法、零位移法、刚性吊杆法和最小弯曲能量法4种现有合理成桥索力的计算方法进行仿真分析并对比其优、缺点,提出应用数据标准化方法对计算结果进行优化。结果表明:常规方法适用性均一般,求解的索力并不均匀,结构内力状态也并没有达到最合理;以计算结果相对较好的最小弯曲能量法为基础,引入数据标准化能够有效减少成桥状态系杆及拱肋的最大弯矩,并使索力分布更均匀。

The structure of irregular arch bridge is complex,to which the application of conventional cable force calculation theory is limited to a certain extent.To study the cable forces of the completed irregular arch bridge,a 157 m-long asymmetric bowstring steel arch bridge with three planes of inclined hangers is cited as a case.Numerical analysis was conducted to compare the advantages and disadvantages of the current four methods to calculate rational cable forces in complete state,including the rigid-support continuous beam method,zero-displacement method,rigid hanger method and least bending energy method.Based on the comparison,a way of using data standardization method to optimize the calculation results is proposed.The optimization result shows that the applicability of conventional methods is mediocre,the cable forces obtained are not uniform,and the internal force condition of the structure does not reach the most rational state.Based on the least bending energy method that generates the relative better calculation results,the introduction of data standardization can effectively reduce the maximum bending moment of the ties and the arch ribs in the complete bridge state,and allow the distribution of cable forces to be more uniform.