Abstract
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.
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