Dynamic Response of an Elastic-Supported Bridge Beam Subjected to Velocity-Varied Moving Loads

Abstract:

Dynamic response of an elastic-supported bridge under speed-varied moving loads was investigated. A mathematical model of vehicle-bridge coupled oscillation for an elastic-supported bridge was built up by means of 1/4 vehicle model (Mass-Spring-Mass) and Euler-Bernoulli beam theory. And then dynamic equations of vehicle-bridge coupled oscillation in matrix form were established using two former orders general coordinates of an elastic-supported beam and model superposition method. The influences of vehicle-bridge coupled vibration model, elastic-supported stiffness, entrance speeds and acceleration /deceleration of moving loads on the dynamic responses of bridges were studied. Vehicle-bridge coupled vibration model based on 1/4 vehicle model can more accurately describe the dynamic characters of bridges than that based on constant moving force model. Elastic-supported stiffness only has an impact on the fluctuation amplitudes of dynamic responses. The vehicle-induced impact factor is dependent on the entrance speeds, acceleration/deceleration of moving loads and elastic-supported stiffness.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 2802-2807
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.2802
• Online since: November 2012
• Authors: Fu Liang Mei, Gui Ling Li
• Keywords: Dynamic Response, Elastic-Supported Bridge Beam, Vehicle-Bridge Coupled Vibration Modal, Velocity-Varied Moving Load

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