Techno Press

Steel and Composite Structures   Volume 22, Number 1, September20 2016, pages 1-12
Dynamic numerical analysis of single-support modular bridge expansion joints
Xinzhe Yuan, Ruiqi Li, Jian'guo Wang and Wancheng Yuan

Abstract     [Full Text]
    Severe fatigue and noise problems of modular bridge expansion joints (MBEJs) are often induced by vehicle loads. However, the dynamic characteristics of single-support MBEJs have yet to be further investigated. To better understand the vibration mechanism of single-support MBEJs under vehicle loads, a 3D finite element model of single-support MBEJ with five center beams is built. Successive vehicle loads are given out and the vertical dynamic responses of each center beams are analyzed under the successive loads. Dynamic amplification factors (DAFs) are also calculated along with increasing vehicle velocities from 20 km/h to 120 km/h with an interval 20 km/h. The research reveals the vibration mechanism of the single-support MBEJs considering coupled center beam resonance, which shows that dynamic responses of a given center beam will be influenced by the neighboring center beams due to their rebound after the vehicle wheels depart. Maximal DAF 1.5 appears at 120 km/h on the second center beam. The research results can be utilized for reference in the design, operation and maintenance of singlesupport MBEJs.
Key Words
    single-support modular bridge expansion joints; vehicle loads; coupled center beam resonance; dynamic amplification factors; finite element model
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Siping Road 1239, Shanghai, 200092, China.

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