The mechanical behavior of the hinged-girder floating bridge is elusive, because the main girder will produce elastic deformation induced by moving loads, as well as movement owing to the action of pier pontoons. Each section of hinged girder has been studied considering the rigid-body motion and elastic deformation at the same time. The moving equations of the hinged-girder floating bridge are established based on the vibration theory of beams. Motion of pier pontoons is studied in time domain as rigid floating bodies with potential theory. The total matrix equation is set up with the assuming modal method, which can be solved numerically. Examples indicate that the present model can express behaviors of the present type of floating bridge efficaciously, which provides technical means for the design and analysis of floating bridges.

铰梁浮桥的力学行为是难以捉摸的，因为主梁会产生由移动载荷引起的弹性变形，以及由于码头浮桥的作用而产生的运动。同时考虑刚体运动和弹性变形对铰链梁的各截面进行了研究。基于梁的振动理论，建立了铰梁浮桥的运动方程。桥墩浮筒的运动在时域中被研究为具有势论的刚性浮体。总矩阵方程采用假设模态法建立，可进行数值求解。实例表明，该模型可以有效地表达现有浮桥的行为，为浮桥的设计和分析提供了技术手段。