The dynamic response of a new kind of coastal gasbag-type floating bridge subjected to a moving load was investigated.The fluid was described by the ALE method,the structure was described by the Lagrangian method and the coupling process between the structure and fluid was achieved by using the penalty method.The feasibility and correctness of the method was verified by comparing the resutls with the experimental ones.A finite element model of the floating bridge was established,and its equilibrium position was determined.Based on the initial state analysis,the process of a truck driving on the floating bridge was simulated.The vertical displacements of the middle plate under different loads and speeds were studied,and the influence of gap between adjacent modules was also analyzed.Besides, the maximum principal stresses of gasbags at different time were analyzed,and the region of maximum stress was investigated.These results can provide valuable suggestions for the design of this type of bridges.%针对一种新型海岸囊式浮桥，分析了其在移动载荷作用下的动力响应问题。基于 ALE 方法描述浮桥周边流体及囊内气体，采用拉格朗日方法描述浮桥结构，并结合罚函数方法实现结构与流体之间的耦合。通过与以往试验数据的比较，验证了此方法的可行性。建立了囊式浮桥的三维有限元模型，确定了浮桥的初始平衡位置。在此基础上，模拟了重载卡车在浮桥上的通行过程。通过比较浮桥中部承重板的位移，研究了载重、速度及拼装间隙等因素对浮桥位移响应的影响。针对作为浮桥关键结构的囊体，分析了其不同时刻的最大一阶主应力，以及最大应力出现的位置。研究结果可为这类新型浮桥的设计提供参考依据。
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