由于铰接梁式浮桥的主梁在移动荷载作用下产生弹性变形的同时，还会随着桥脚舟浮箱的运动而运动，其力学特征比较复杂。将每一段铰接梁独立进行研究，同时考虑了刚体运动与弹性变形，在梁振动理论的基础上建立了浮桥的运动方程。在移动集中荷载模型的基础上构建了多轴车辆模型，在势流理论基础上对桥脚舟浮箱进行了时域运动分析，运用假设模态法构建了总体矩阵计算方程并进行计算。计算算例结果表明，所构建计算模型得出的结果能够有效地反映浮桥的运动规律，为浮桥的设计与分析研究提供了技术手段。
Abstract
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 bridge-foot-boat pontoons. Every hinged girder is studied independently considering the rigid 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. A multi-axles vehicle model is constructed based on the moving concentrated load model. Bridge-foot-boat pontoons are studied as rigid floating bodies with potential theory in time domain. The total matrix equation is set up with the assuming modal method, which can be solved numerically. Examples indicate that results of the present calculation model can effectively reflect the motion law of the present type of floating bridge, which provides technical means for the design and analysis of floating bridges.
关键词
铰接梁式浮桥 /
结构振动 /
移动荷载 /
动力学模型 /
势流理论 /
假设模态法
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Key words
hinged-girder floating bridge /
structure vibration /
moving load /
dynamic model /
potential theory /
assuming modal method
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