Optimizing Safety Design of Median Barriers on Urban Elevated Road

In the collision accident between the vehicle and barriers, not only the barriers be able to effectively block a vehicle out of control, but also they need to have fine function to guide the vehicle to return to the normal running direction more quickly. Based on Ls-dyna calculating platform, the paper analyzed the interaction mechanism of vehicle and barriers, and the structure of anti-collision barriers. Considering to improve the holistic smooth degree after deformation of the barriers, and reduce the rigidity of the articulated components and increase the barriers' holistic soft degree, an optimum design is made to the median barriers of two-hinged structure designed already, which is component of cuboid concrete blocks of F type. And the response acceleration of vehicle and displacement of barriers are given. By comparing and analyzing the simulating results with that of the barriers designed already, an optimal median barriers model is given for urban elevated road at last, which is component of a new form of parallelepiped oblique section blocks and has more advantageous protection function of crash safety. This will provide an important basis to improve the structure and reasonable design a new type of anti-collison barriers for urban elevated road in our country.