Abstract:To study the influence of bidirectional collision on the seismic response of continuous skew girder bridges, the Kelvin-Voigt model was used to simulate the longitudinal collision phenomenon at the expansion joint of the abutment, and the simplified hysteresis model was used to simulate the lateral collision process between the link stopper and main beam. Therefore, a parametric comparison study on a three-span skew continuous bridge was conducted. The study shows that the effect of bidirectional collision on the lateral displacement of the main beam is much larger than that of longitudinal collision, and the abutment clearance has the greatest influence on the plane angle of the main beam:the plane angle decreases with the increase of the abutment clearance. The effect of lateral collision on the curvature deformation of the pier is much larger than that of the longitudinal collision, particularly the influence of the intensity of the link stopper. When the intensity of the link stopper increases from 0% to 50%, the mean values of the longitudinal and lateral curvatures of the pier increase 13.43 times and 7.21 times, respectively. With the increase of the skew angle, the longitudinal displacement of the butt of beam increases continuously, and the lateral displacement and plane rotation angle first increase and then decrease; the longitudinal curvature of the bottom of the pier continues to grow, and the lateral curvature alternately increases and decreases. The longitudinal collision effect first weakens and then increases, which is opposite of the lateral collision effect. Because the effect of the lateral collision on the pier is much larger than that of the longitudinal collision, it is advisable to reduce the lateral collision effect when the skew angle is 15°-45°.