IDENTIFICATION OF DYNAMIC VEHICULAR AXLE LOADS USING SUPERPOSITION TECHNIQUE AND INFLUENCE LINE
This paper presents a method for identification of dynamic interaction forces between moving vehicles and the bridge deck. Two vehicle models have been introduced: a single-degree-of-freedom (SDOF) vehicle model and a full-scale vehicle model. Equation of motion for the bridge is established using the mode superposition technique. The bridge-vehicle coupling equations are established by combining the equations of motion for both the bridge and vehicles. The vehicle-bridge coupling system contains only the modal components of the bridge and the physical parameters of the vehicle. An influence surface, whose concept is extended from an influence line, for the bridge response (either deflection or strain) is obtained with the help of the ANSYS program.Using the superpesition technique and the influence surface established, the dynamic interaction force can then be predicted from the measured bridge response. Series of case studies have been carried out and results demonstrate that the proposed method is able to identify the dynamic interaction force with good accuracy. Real bridge tests have also been performed on a bridge in Louisiana, and the identified dynamic axle loads are close to the static axle loads. The methodology will be applied to improve the current weigh-in-motion techniques that usually require a smooth road surface and slow vehicle movement. The developed methodology will also be useful to predict real vehicle forces on bridges, which will provide more reliable live load information for bridge fatigue assessment and performance evaluation.
Vehicle Bridge Dynamics
Lu Deng Chan-Sheng Cai
Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, Louisian Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, Louisian
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
1453-1458
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）