The design of bridge is accomplished by magnifying static live load effect by a factor known as impact factor. In design codes of most of the countries, impact factor is provided as a function of bridge length or fundamental natural frequency. However, many studies recently conducted on bridge vehicle dynamics found other influencing parameters for the impact factor. In the present paper, the dynamic amplification factor of the steel truss girder bridge has been found out taking bridge–vehicle dynamics using finite element method. An uncoupled iterative scheme interfacing the finite element software has been proposed to implement vehicle induced pavement force. The dynamic amplification factors have been obtained for different vital component of the steel truss bridge considering the variation of bridge span, vehicle speed, pavement roughness and inter spacing of successive vehicles on the bridge.

中文翻译：

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钢桁架梁桥动力放大系数分析

桥梁的设计是通过将静态活荷载效应放大一个称为影响因子的因素来完成的。在大多数国家/地区的设计规范中，影响因子是根据桥长或基本固有频率提供的。然而，最近对桥梁车辆动力学进行的许多研究发现了影响因素的其他影响参数。在本文中，采用有限元方法，利用桥梁-车辆动力学，找出了钢桁梁桥的动力放大系数。已经提出了连接有限元软件的解耦迭代方案来实现车辆感应路面力。考虑到桥梁跨度，车速，车速的变化，获得了钢桁架桥梁不同关键构件的动力放大系数。