Research On Collision Effect Under The Strong Earthquake Of Curve Viaduct

In the role of a strong earthquake, the upper structure of the joints on both sidesof a collision, in addition to cause collisions between the local beam damage, thehuge impact force may result in failure of bearings, joints on both sides is too largerelative displacement will cause destructive earthquake damage off the beam,seriously affecting the seismic capacity of the structural system of the bridge.Currently, Bridge expansion joints collision research is also less, especially forhigh pier curved bridge, weight piers lateral bending moment are more vulnerable tothe problem of collisions, and the collision direction is uncertain, the collisionbehavior is more complex. Therefore, it is worthy of further study Pro beam suturalcollision mechanism, influencing factors and their impact on the seismic performanceof the bridge system.Earthquake damage research and theoretical analysis, to explore the phenomenonof the high pier curve bridge collision damage and destruction of properties, crash testresearch progress, to simulate the collision, to avoid or mitigate the impact hazard andseismic performance measures.The dynamic model of the high pier curve bridge must be noted that a number ofissues, including bearing simulation, simulation of the collision cell and its non-linearnature of expansion joints, seismic waves select and input the most unfavorabledirection. Different pier, the radius of curvature and high pier tie beams set onvibration characteristics and laws.Found that with decreasing radius of curvature, thenatural frequency of the structure increases; bridge dynamic performance is closely related to the pier stiffness and pier stiffness bridge cycle is smaller, seismic responseincreases; stability of the high bridge pier Transverse Direction poor, in order toensure the stability of the pier, a constant increase in the number of tie beams, butalong with the modal frequency increases, the earthquake increases, but notconducive to the bridge seismic tie beam settings are to be considered lateral stabilityand overall seismic two aspects, coordination and optimization.The collisions between high pier curved bridge linking analysis model. Timehistory analysis method to study the strong earthquake caused due to collision betweenthe joints on both sides of the Pro-linked main beam internal force, displacement andits variation. Consider does not consider the effect of collisions high pier bridgeseismic response curve (such as the beam displacement, displacement of the top ofthe pier, pier base shear and moment) comparative analysis to discuss the collisionstructure as a whole.Pier height, radius of curvature, expansion joint gap, temporarybeam cycle than other parameters of the law of the impact of the collision responseanalysis; discuss collision worst case.The study found that the collision Pro-linked the end of the pier shear value isslightly smaller, the moment values tended to increase, the pier is likely because ofthe role of the collision and result in bending failure; With the increase of the pier, theimpact force and the number of collisions has increased, but at the same time, highpier partial flexible, more favorable ductility;The smaller the radius of curvature ofthe curved bridge, the number of collisions will increase, and the collision strengthdecreases; same on both sides of the beam vibration period, collision least prone to acertain range, on both sides of the beam vibration characteristics of the greater thedifference, the occurrence of the greater the possibility of collision; joints the smallerthe gap, the smaller the force of the collision, but this will increase the number ofcollisions.Bridge between the connection structure of the Joint collision occurscharacteristics and research of this article to discuss the collision mitigationunfavorable response and effective measures to prevent falling beam damage.