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为确定支架现浇大曲率斜拉桥在恒载作用下的初始索力,以主梁及索塔的弯曲、拉压和扭转应变能之和作为目标函数,考虑位移、弯矩、索力等多种约束条件,结合有限元模型确定全桥各单元内力、位移的高阶影响矩阵,并运用MATLAB中有效集法求解目标函数,从而得出了初始索力。实桥应用结果表明:该方法对支架现浇大曲率斜拉桥有良好的适用性,精度满足工程要求且应用简便,实用可靠,易于推广。
In order to determine the initial cable force of cast-in-situ large-curvature cable-stayed bridge under constant load, taking the sum of bending, tension-compression and torsional strain energy of the main girder and the pylon as the objective function, considering the displacement, moment and cable force A variety of constraints, combined with the finite element model to determine the full-bridge unit internal forces and displacement of the high-order impact matrix, and use MATLAB effective solution set to solve the objective function, and thus obtained the initial cable force. The results of real bridge application show that this method has good applicability to cast-in-situ large-curvature cable-stayed bridge, the accuracy meets the engineering requirements and is simple, practical, reliable and easy to popularize.