为了得到三塔四跨地锚式悬索桥中最优的纵向连接方式，以某座三塔四跨悬索桥为工程背景，建立三维空间有限元模型，考虑各种不同荷载作用对结构响应的影响规律，探讨最优的纵向约束体系。研究结果表明：边塔内力和桩基础内力受地震作用控制，而中塔内力则受汽车荷载控制，伸缩缝变形主要受温度作用控制；在多种荷载作用下，刚性约束体系优于漂浮体系和阻尼约束体系，可以较好地改善各种荷载作用下的响应。通过对约束装置进行位置和参数优化，提出“中塔和桥台处设置纵向固定支座”的刚性优化约束方案。%The objective of this paper is to obtain the optimal longitudinal restraint system of three‐tower four‐span suspension bridge .A three‐tower four‐span suspension bridge (TFSB) in china was used as a case study example .All possible load effects were considered in the optimal finite element analysis .The research results showed that the internal forces of side towers and piles were controlled by the earthquake while internal forces of middle towers were controlled by vehicle loads .In addition ,the relative deformation of expansion joints was seriously affected by temperature effect .Considering the effects of all frequent loads , response of rigidity restraint system was superior to floating system and damping constraint system .Based on optimized analysis of locations and parameters ,the optimal rigidity restraint system was recommended ,which is the longitudinal fixed supports set at middle tower .
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