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为研究斜拉桥其最优成桥索力对主梁内力、线形的影响,以本溪某混合梁斜拉桥为工程背景.在既有索力优化理论的基础上,采用了基于复合约束的最小能量法,以塔梁的拉压应变能和弯曲应变能建立目标函数,运用显示梯度的数学表达式进行求解.研究结果表明:钢梁侧最大负弯矩为83 292.49 k N·m,混凝土侧最大负弯矩为18 934.7 k N·m,主梁最大下挠为40.1 mm,出现在钢梁侧且距离主墩0.75 L处,优化后索力更加均匀合理,计算结果可以满足工程要求,在同类桥型中有良好的借鉴意义和参考价值.
In order to study the influence of optimal cable tension of cable-stayed bridge on the internal force and linear shape of the main girder, a hybrid cable-stayed bridge with Benxi is taken as the engineering background.Based on the existing cable force optimization theory, Minimum energy method, the objective function is established based on the tensile and compressive strain energy and bending strain energy of the tower girder, and the mathematical expression of the gradient is used to solve the calculation.The results show that the maximum negative bending moment of the steel beam is 83 292.49 kN · m, The maximum negative bending moment is 18 934.7 kN · m, the maximum deflection of the main girder is 40.1 mm, appears on the side of the steel beam and 0.75 L away from the main pier, and the optimized cable force is more uniform and reasonable. The calculated results can meet the engineering requirements, In similar bridge type has a good reference and reference value.