Disaster protection of coastal bridge with cable ... · strainer ind g decks fo ridge retro)...
Transcript of Disaster protection of coastal bridge with cable ... · strainer ind g decks fo ridge retro)...
Disaster protection of coastal bridge with cable restrainer under hurricane-induced waves
*Rongcan Hong1) , Anxin Guo2), Qinghe Fang3) and Jiabin Liu4)
1), 2) ,3), 4) School of Civil Engineering, Harbin Institute of Technology, Harbin, China
ABSTRACT
Huge waves in hurricane would generate significant vertical and horizontal wave forces on the bridge superstructures, consequently resulting the movement, even unseating, of the superstructure. This paper presents a prior investigation on using cable restrainer to connect the superstructure and substructure for mitigating the wave-induced damage of coastal bridges. To achieve this purpose, a 3D finite element model, considering the nonlinear pier behavior and soil effects, was built by using OpenSees software package. The structural responses of the coastal bridge are analyzed under wave forces for the bridge with and without the cable restrainers. The analyzed results indicated that cable restrainer could significantly reduce not only the maximum transversal displacement of bridge deck but also the residual displacement. Furthermore, compared to other countermeasures, the cable restrainer would also induce much lower damage on the substructures of the coastal bridge. 1. INTRODUCTION Extreme events have caused significant damage to coastal bridges. During Hurricanes Ivan in 2004 and Katrina in 2005, at least 11 highway and railroad bridges along the U.S. Gulf Coast were damaged by a combination of storm surge and wave action (Padgett et al., 2008). Surveys of the damaged bridges suggested that the connection failure between bent-cap and superstructure was the main reason for the overall failure (Douglass et al., 2004). Since then, lots of research has been conducted to figure out the mechanism of wave-structure interaction. Bradner et al. (2011) performed an experiment with a 1:5-scale reinforced concrete model of the I-10 bridge over Escambia Bay to investigate the wave action acting on the bridge under regular and random waves. A small-scale experiment of tsunami loads on coastal bridge decks was conducted by Lukkunaprasit et al. (2011) to study the effect of perforations in the
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LUSIONS
his paper aestrainer ied to extrepe structuron results ng wave inthe displa
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