Dynamic amplification of a multi-span, continuous orthotropic bridge deck under vehicular movement: Fid-Bau Portal

Dynamic amplification of a multi-span, continuous orthotropic bridge deck under vehicular movement

Rezaiguia, A. / Ouelaa, N. / Laefer, D.F. / Guenfoud, S.

Highlights • Vibrations of an orthotropic multi-spans, continous bridge decks under moving vehicle with 7 DOF are studied taking into account the bridge deck interaction and rolling surface irregularities. • The modal and Newmark’s integration methods are used to solve the coupled equations of motion bridge deck-vehicle in decoupled manner. • The results of natural frequencies obtained show the accuracy of our results by comparing them with results obtained by the ANSYS software. • Distribution of Dynamic Amplification Factor on a bridge deck does not reflect a particular trend. • The effect of track irregularities on the dynamic response of the bridge deck is very important.

Abstract The response of a multi-span, continuous orthotropic bridge deck during truck loading is investigated to better understand the dynamic interaction between moving vehicles and highway bridge decks. The present study is based on a recently published, semi-analytical approach for free vibration in which the modal superposition method incorporates intermodal coupling. Herein, the bridge deck is modeled as a jointless, multi-span, orthotropic plate, and the vehicle is modeled as a dynamic, multi-body system. The road surface roughness randomness is modeled as a normal, stationary, random process described by its Power Spectral Density (PSD). The coupled equations of the motion vehicle/bridge deck are solved by Newmark’s method. An iterative process in each time step is performed to find the equilibrium between the bridge deck and vehicle tires using an uncoupled algorithm previously developed by other authors. Two numerical application examples are presented: an isotropic and an orthotropic, three-span bridge deck both crossed by an AASHTO-based vehicle model. In example one, the intermodal coupling affects the dynamic deflection of bridge deck but only slightly. Example two demonstrates that the loading mode and the vehicle speed have a significant influence on the Dynamic Amplification Factor. However, the most important parameter to affect the dynamic vehicle/bridge deck interaction force is the road’s surface roughness, as has been shown for other bridge types under various load conditions.