矮塔斜拉桥单侧断索和双侧对称断索影响效应分析

为研究断索现象对矮塔斜拉桥力学性能和安全性的影响，以浙江某实际工程为背景，使用Midas/Civil建立有限元模型，研究单侧单束断索和双侧对称断索两种工况分别对斜拉索索力、塔顶DX位移和主梁跨中弯矩的影响。研究发现：单侧断索对断索侧索力和跨中弯矩、主塔塔顶DX位移的影响较大；双侧对称断索对主塔两侧索力和跨中弯矩影响趋势相同，对边塔塔顶DX位移影响较大；最外侧斜拉索断裂对3个力学指标的影响均为最大，故实际运营中应重视对外侧斜拉索的保护。

Analysis of Influence Effect of Unilateral and Bilateral Symmetrical Cable-stayed Bridge with Low Pylon

In order to study the influence of cable breaking on the mechanical properties and safety of low pylon cable-stayed bridge,a finite element model was established by Midas/Civil based on a practical project in Zhejiang province,and the effects of unilateral single bundle cable breaking and bilateral symmetrical cable breaking on cable force,tower top DX displacement and mid span bending moment of main girder were studied respectively.The results show that the unilateral broken cable has great influence on the side cable force,mid span bending moment and DX displacement of main tower top;the influence trend of bilateral symmetrical broken cable on both sides of main tower and mid span bending moment is the same,and it has great influence on DX displacement of side tower top.Therefore,attention should be paid to the protection of the outer stay cable in actual operation.