ABSTRACT

In this paper, an anti-collision steel box barrier used in an over-bay cable-stayed bridge is introduced. The whole history of a ship colliding on the cap with anti-collision box barrier is simulated. To clarify the influence of pile-soil interaction, the ship-cap-subsoil model is developed. By taking the Fast Fourier Transformation toward the plastic displacement of the RC cap, the dynamic properties of the cap are obtained and the damage induced by ship collision is evaluated. Furthermore, the anti-collision efficiency of the steel box barrier installed on the cap of the cable-stayed bridge is discussed.

INTRODUCTION

With the rapid development of infrastructure network, several cross-sea highway bridge projects have been completed. In these projects, bridges play an important role, but it also behaves as a man-made obstacle in the navigation channel. In the recent years, the collapse accidents due to ship collision become more and more serious. According to the statistics by Dong (2009) based on 503 collapse accidents of bridges in 66 countries, there were 91 ones caused by various collisions, and 56 accidents were induced by vessel collision. According to the statistics, only for the Wuhan Yangtze River Bridge, it suffered 76 ship collision accidents after its opening for traffic. A similar investigation by Wardhana (2003) on 503 bridge collapses in the United States from 1989 to 2000, which indicated that the most frequent causes of bridge failures were attributed to floods and collisions.

When a ship acts on a bridge pier, it may not only influence the normal operation of the navigation channel, but also seriously threat the structural safety of the bridge. In addition to the static calculation equations given by many scholars and used in codes (Meier-Dornberg, 1983; AASHTO 1991), several dynamic vessel-impact analysis techniques have been recently proposed, where a force-deformation curve was employed to model the vessel bow stiffness. Most studies mainly focused on the force-deformation curves of the barge bows rather than the ship bows. Consolazio (2003) computed the forcedeformation relationships for several scenarios of hopper barge crushing, and compared the results obtained from the nonlinear finite element crush analysis and the empirical crush models in bridge design specifications. Fan (2014) developed a high resolution finite element model to obtain the ship bow force-deformation curves with consideration of the effect of pile-cap depth. Storheim (2016) calculated the collision response of the bulbous bow of a full scale offshore service vessel by using ABAQUS and LS-DYNA, and investigated the influence factors such as numerical setup, element formulation and mesh size. To detect the damage induced by ship collision, Ferraro (2013) used an ultrasonic pulse velocity test to assess the integrities of the structure before and after impact. Sha (2013) extracted the vibration data before and after collision, and used the frequency domain decomposition method to estimate the bridge damage state after barge impact accident.

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