Abstract
Abstract Horizontally curved bridges have more complex seismic behavior than straight bridges and have been more vulnerable to earthquakes. The present study aimed to evaluate the seismic response of concrete bridges with straight and arched box girder decks in isolated and non-isolated states. The results indicated that increasing the curvature of the non-isolated bridge could increase the irregularity. In addition, increasing the curvature of the deck leads to an increase in shear force, bending moment, and displacement in the piers in the radial direction of the arc, and causes vulnerability of the piers in this direction. Further, in the deck of the bridge, the reduction of the arc radius, especially in the non-isolated bridges, considerably increases the radial shear force, torsion and minor bending moment of the deck. In both isolated and non-isolated cases, the demand in the piers and deck of the bridge under the influence of near-fault ground motions is greater than that of the far-field earthquakes. Seismic isolation results in reducing the force demand in the pier, and the deck of the bridge, leading to a reduction in the force demand rate caused by increasing the central arc angle on the bridge deck.
Highlights
As horizontally curved bridges with high-curvature are dynamically considered with geometric irregularity, they have no appropriate seismic response to earthquakes (Soberón and Soberón (2017))
Increasing the deck curvature leads to an increase in the force demand on the bridge deck and piers, which plays a significant role on the seismic vulnerability of the bridges such as the damage caused by the curved spans of Baihua Bridge in the earthquake occurred in 2008 in Wenchuan, China (Han et al (2009))
Giménez et al (2011) studied the dynamic behavior of curved bridges equipped with seismic isolators such as Lead Rubber Bearing (LRB), Friction Pendulum Bearing (FPB) and High Damping Rubber Bearing (HDRB) with different structural and damping specifications and evaluated the vulnerability of curved bridges in plan due to the deck impact in the expansion joints
Summary
As horizontally curved bridges with high-curvature are dynamically considered with geometric irregularity, they have no appropriate seismic response to earthquakes (Soberón and Soberón (2017)). Giménez et al (2011) studied the dynamic behavior of curved bridges equipped with seismic isolators such as Lead Rubber Bearing (LRB), Friction Pendulum Bearing (FPB) and High Damping Rubber Bearing (HDRB) with different structural and damping specifications and evaluated the vulnerability of curved bridges in plan due to the deck impact in the expansion joints. Ghosh et al (2012) studied the types of seismic isolators in the response of continuously curved bridges in plan under the influence of the near-fault ground motion of Kobe and found that LRB, HDRB and FPB systems could reduce the response of pier displacement and force. Seismic isolators reduced the difference between the bending moments and shear force values of the deck due to a decrease in the arc radius of the deck and bringing them closer to the straight bridge
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
