Abstract
Dynamic response of a single span bridge subjected to moving flexible vehicles has been studied using a semianalytical approach. The eccentricity of vehicle path giving rise to torsional motion of the bridge has been incorporated in the approach. The bridge surface irregularity has been considered as the nonhomogeneous process in spatial domain. A closed form expression has been derived to generate response samples corresponding to each input of roughness profile to form an ensemble. Thereafter, averaging across the ensemble has been carried out at each time step to determine mean and standard deviation of bridge and vehicle response. Further, dynamic amplification factor (DAF) of the bridge response has been obtained for several combinations of bridge-vehicle parameters. The study reveals that structural bending modes of vehicle can significantly reduce dynamic response of the bridge. The eccentricity of vehicle path and flexural/torsional rigidity ratios plays a significant role in dynamic amplification of bridge response.
Highlights
The dynamic effect resulting from the passage of vehicles is an important problem generally encountered in the bridge design
The results reveal that dynamic amplification factor decreases by an amount of 23% to 34% when the ratio of torsional rigidity to flexural rigidity of bridge increases from 0.002 to 0.01
Individual and combined effects of several bridge-vehicle parameters have been considered to find out the response statistics
Summary
The dynamic effect resulting from the passage of vehicles is an important problem generally encountered in the bridge design. The irregularity or unevenness of the bridge pavement surface is the main cause of exciting the vehicle which in turn imposes a time varying load as it travels along the span of the bridge. Starting from the year 1922, various theoretical and experimental studies have been conducted to understand the dynamic behavior of bridge subjected to moving load. Earlier researchers have considered vehicle as a moving mass on the bridge, either neglecting their inertia effect or incorporating the same. Researchers have revealed various dynamic characteristics for practical applications, modern bridges of slender cross-section and larger span do not reflect true behavior when moving mass problems have been solved. The deformation of bridge can cause significant change in dynamic forces at the contact point of the vehicle wheel
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