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以在建1080 m主跨的三塔双跨悬索桥——泰州长江公路大桥为工程背景,采用三维非线性空气静力和动力稳定性分析方法,对其动力特性、空气静力和动力稳定性进行了分析,并与相同桥跨布置中间桥塔采用混凝土塔的方案桥,以及相同主跨的双塔单跨悬索桥的抗风稳定性进行了比较。结果表明:增大中间塔的刚度,可以有效提高三塔悬索桥的扭转频率以及抗风稳定性;由于中间塔缺乏有效的固定作用,与双塔悬索桥相比,三塔悬索桥的空气动力稳定性差,但其静风稳定性则较好。
Taking the three-tower double-span suspension bridge built at 1080 m as the main span, the Taizhou Yangtze River Highway Bridge as the engineering background, three-dimensional nonlinear aerostatic and dynamic stability analysis methods are used to analyze the dynamic characteristics, aerostatic and dynamic stability The stability of the wind-induced stability of the twin-tower single-span suspension bridge with the same main span is compared with that of the bridge with the same bridge across the bridge. The results show that increasing the stiffness of the intermediate tower can effectively improve the torsional frequency and wind-induced stability of the three-tower suspension bridge. Due to the lack of effective fixing effect of the intermediate tower, compared with the twin tower suspension bridge, the aerodynamic stability of the three- But the static wind stability is better.