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以单承重面刚性拉杆斜拉桥为研究对象,基于主梁刚度无穷大的假定和能量原理推导出带有刚性拉杆考虑扭转变形时斜拉桥侧向弹性稳定系数的解析计算公式。通过对同一算例分别用推导公式、有限元法及其它近似计算公式进行对比计算,推导公式的正确性得到了验证;同时对斜拉桥的结构参数进行分析,讨论了它们对桥塔侧向弹性稳定性系数的影响规律。结果表明:计入刚性拉杆扭转变形后,桥塔侧向弹性稳定系数有所提高,更接近实际情况;桥塔的抗弯刚度对考虑非保向力效应的桥塔侧向弹性稳定性影响较大;当桥塔抗弯刚度较小时,拉杆抗扭刚度对桥塔侧向弹性稳定性影响较大。
Based on the assumption of infinite rigidity of main girder and the principle of energy, the analytical formula of lateral elastic stability coefficient of cable-stayed bridge with rigid tie rod considering torsional deformation is deduced. By comparing the same example with the derivation formula, the finite element method and other approximate formulas respectively, the correctness of the derivation formula is validated. At the same time, the structural parameters of the cable-stayed bridge are analyzed, The Influence Law of Elastic Stability Coefficient. The results show that the lateral elastic stability coefficient of the bridge tower is increased after the torsional deformation of the rigid rod is taken into account, which is closer to the actual situation. The flexural stiffness of the bridge tower has more influence on the lateral elastic stability of the pylon considering the non-directional effect When the flexural rigidity of the pylon is small, the torsional stiffness of the tie rod has a great influence on the lateral elastic stability of the pylon.