Effects of Impact Loads on Local Dynamic Behavior of Orthotropic Steel Bridge Decks
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Online ISSN 2093-6311 Print ISSN 1598-2351
Effects of Impact Loads on Local Dynamic Behavior of Orthotropic Steel Bridge Decks Niujing Ma1,2 · Ronghui Wang1 Received: 23 April 2019 / Accepted: 6 October 2020 © Korean Society of Steel Construction 2020
Abstract To investigate the local dynamic behavior of orthotropic steel bridge decks under impact loads, this paper proposed a type of combined plate-beam element for analysis of trapezoidal stiffened plate and a type of 8-nodes solid-plate element for analysis of pavement. Besides, vehicle wheel loads are supposed to be triangular loads for convenience. Then, a model experiment was conducted to verify the accuracy of the proposed approach. Finally, River-sea-through channel of Hong Kong–Zhuhai–Macao Bridge is taken as an engineering case for computation analysis. The results are compared with those from FE software ANSYS. It shows that: first, the proposed approach is both accurate and efficient; second, bridge deck pavement has the effect of both self-weight and rigidity, which requires the bridge deck pavement be considered when analyzing the mechanical properties of bridge deck structure. Keywords Vehicle impact · Orthotropic steel bridge decks · Dynamic behavior · Bridge deck pavement · Plate-beam element
1 Introduction Long span bridges usually adopt steel box girders of which the bridge deck structures are orthotropic steel bridge decks. During operation, the bridge decks are subjected to quantities of traffic loads, thus it is of great significance to investigate the mechanical behavior of orthotropic steel bridge decks. In practical engineering, the traffic loads are mainly dynamic loads of the vehicles. Under long-term vehicle loads, the bridge decks are subjected to impact action, which can cause local vibration fatigue damage of the structure. On the other hand, the local deformation of the bridge decks will affect vehicles’ running smoothness, which is the main reason of the local vibration of the bridge decks, and in turn, this can affect the safety and stability of running vehicles. The current publications and design specifications concentrate on the static, stability and conventional fatigue problems, while no local dynamic computation and design issues * Niujing Ma [email protected] 1
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
State Key Laboratory of Traction Power, Chengdu 610031, China
2
of orthotropic steel bridge decks are involved. Actually, under vehicle impact loads, stress concentration often occurs in the connection between the plate and stiffeners, and this may lead to local cracking of orthotropic steel bridge decks. Therefore it is essential to reveal how impact loads influence the local dynamic behavior of orthotropic steel bridge decks. As is known to all, orthotropic steel bridge decks are a type of stiffened structures, consequently, some researchers studied their mechanical problems upon taking them as common stiffened plates (Byklum et al. 2004; Ma
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