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为探究多塔连跨悬索桥非漂移体系由于温度变化结构(尤其中塔)产生的次内力效应,通过对多塔连跨悬索桥有限元计算分析,确定三塔以上悬索桥采用非漂移体系的可能性,以及三塔以上悬索桥不同塔梁约束体系最优组合形式,探寻多塔连跨悬索桥非漂移体系的适用性。研究结果表明:对于多塔连跨悬索桥,中塔只设置一处非漂移体系能有效避免温度效应在中塔塔底产生的较大附加力的作用,在减弱温度荷载影响的同时还可提高主缆抗滑性能及桥梁整体刚度,减小加劲梁纵向位移,不推荐多塔连跨悬索桥选用拥有2座或2座以上采用非漂移体系桥塔的塔梁约束体系组合。研究成果为同类型桥梁设计提供技术指导,并为多塔连跨悬索桥非漂移体系形式的推广提供了可靠理论支撑。
In order to investigate the sub-internal force effect of non-drift system of multi-tower continuous suspension bridge due to temperature changes (especially mid-tower), the possibility of using non-drift system for suspension bridges above three towers was determined by finite element analysis of multi- As well as the optimal combination of different tower girder restraint systems for suspension towers above three towers, to explore the applicability of non-drifting system of multi-tower suspension bridges. The results show that for a multi-tower spanned suspension bridge, only installing a non-drifting system in the middle tower can effectively avoid the large additional force generated by the temperature effect on the bottom of the middle tower, and can reduce the influence of temperature load and improve the main Cable skid resistance and the overall stiffness of the bridge to reduce the longitudinal displacement of stiffening girder, it is not recommended to use multi-tower spanned suspension bridge with two or more than two towers using non-drifting system tower restraint system combination. The research results provide technical guidance for the design of similar bridges and provide a reliable theoretical support for the promotion of the non-drift system of multi-tower suspension bridges.