Effect of bump at expansion joint on dynamic response of twin i-girder bridges under moving vehicle

Abstract eng:
Bump-related vibration problems have been commonly recognized. However, no unified engineering solutions have found, primarily because of the number and complexity of the factors involved. This paper tries to establish correlations of bump heights, roughness classes, vehicle speeds with dynamic amplification factors of a simply supported twin I-girder bridge by analytical analyses. Elaborate three-dimensional finite element models are generated to deal with the bridge-vehicle interaction dynamics. The studied bridge is idealized in detail with solid and shell elements for concrete deck and steel members, respectively. A detailed nonlinear 3-D vehicle model, which is capable to account for the effects of bouncing, rolling, pitching of vehicle body as well as separating between tires and road surface, is developed according to AASHTO three-axle design truck HS20-44. Correlated road surface roughness profiles are used in combination of bumps at the entrance expansion joint.

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