The perceptible vibration of composite steel twin I-girder bridges under live loads is an important design consideration in today's bridges. Although, in accordance with the bridge design codes, the strength design and the deflection control of these bridges are covered fairly well, vehicle movement on the bridge may still cause vibrations that are too strong from the viewpoint of pedestrians. In this study a comprehensive numerical model for studying bridge-vehicle interaction and the resultant perceptible vibration were conducted. To this end, three-dimensional finite element models for bridge and vehicle are developed by using ANSYS code. Road roughness profiles are generated from power spectral density and cross spectral functions. A parametric study is performed to identify the effect of various parameters on the vibration of the bridge. This study finds that the bridge response is significantly influenced by the road roughness conditions and bump height at expansion joint. Based on the parametric study results, simple design guidelines for the serviceability performances of steel twin I-girder bridges are presented.
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