列车荷载作用下六七式铁路舟桥动力学特性数值模拟研究

On the Numerical Simulation of the Mechanical Characteristics of the 67-type Railway Pontoon Bridge Under Live Loads

对于重要深水大跨桥梁遭受严重损坏(地震、战争等因素)而发生垮塌情况下,应对的办法只有采用既有的浮渡技术和设备,即首先开通轮渡,随后架设浮桥。对于制式铁路浮桥,我国储备量较大的是六七式铁路舟桥。以六七式铁路舟桥为例,基于弹性基础理论,通过ANSYS有限元软件建立实体模型,考虑在列车活载作用下,针对不同列车速度对浮桥传统布置方案与优化方案的动力学性能进行了研究。分析结果表明,与传统布置方案相比,优化后的六七式舟桥桥脚布置方案在一定程度上可以提高列车通行速度。对新一代应急浮桥的设计和管理具有一定的参考价值。

When an important deep-water bridge is seriously damaged or collapses either in an earthquake,in a war or by other factors, the current solution to it is nothing but the application of the floating techniques and equipment. Namely, first, open the ferry, and then erect a pontoon bridge. As far as the standardized railway pontoon bridge is concerned, we have a large number of 67- type railway pontoon bridges in reserve in China. With the 67-type railway pontoon bridge as a practical example, and upon the basis of the elastic foundation theory, a finite element real model is established with help of the ANSYS software in the paper. With all the live loads exerted to the train taking into account, the effects of different train speeds on the mechanical properties of the 67-type railway pontoon bridge are studied in detail. As shown in those results,com- pared with the traditional layout of floating piers, the greater train speed can be further achieved after the layout of the floating piers for the 67-type railway pontoon bridge being optimized. Therefore, the results of our research may be used as the theoretical bases for the design and management of next generation of railway pontoon bridges.