WANG biao1, LIU Jun1, YANG Shuai2

 

(1. Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China;

 

2. China Automobile Technology and Research Center, Tianjin 300300, China)

 

 

Abstract: Aiming at the less research for cars and bridge collision ,the research were mostly for anti collision pier,and research for vehicle and occupant protection were least,flexible anti collision device on urban viaduct pier were studied based on our self developed boat bridge flexible energy absorption anti collision device. Finite element simulation method (built model by Pro E, Pretreatment by Hyper Mesh, simulated by LS DYNA) were used to simulate the car with speed of 80km/h, the collision angle of 90° positive high speed collision of urban viaduct pier.Simultaneously,simulation model which a car at the speed of 60km/h, the collision angle for urban viaduct pier is 20°crashed with anti collision device were built, too. In order to study anti collision device in the collision energy absorption, cushioning and guiding role, 4indicators, vehicle′s trajectory, acceleration of the B pillar, energy and the collision impact force, were put forward to assess the effect of device,meanwhile a new flexible anti collision device was designed.The result indicate that when the car positive high speed crashed with urban viaduct pier the impact force is reduced by a 1700kN to 1000kN, to meet the “General Specification for Highway Bridge Design” requirements after setting the anti collision device and when the car side low speed crashed with urban viaduct pier the anti collision device can guide the vehicle at a constant speed back to the original lane.

 

Key words: flexible crash; finite element method(FEM); protection; guide