Dynamic Response Analysis Of Vehicle On The Bridge

The construction of a large number of crossing bridge of the urban road and highway is not only a main route to ease the traffic pressure, but also a kind of beautiful scenery For a variety of reasons, such as the vehicle overload ultra and the drivers of illegal driving, vehicle collision accident of the bridge occur frequently. To the controlling and forecasting the vehicle collision accident of the bridge, the foreign country have done a lot of research work, but the research on the dynamic response of car on the bridge is still less. Aim at the usual forms of bridge piers of the crossing bridge, the paper analyzed its Nonlinear dynamic response of vehicle impact on bridges, compared and analyzed its advantages and disadvantages, in order to provide the reference for the conceptual design of the bridge.and the anti-collision equipment. The main work is as follows:First of all, the paper introduced several basic theories and methods of vehicle impact on bridges; the lashing of vehicle impact on bridges mainly due to the high speed of the vehicle movement, and due to the mechanical behavior of the impact of vehicle and ship on the bridge are similar, and summed up the calculation method and research status of the impact of ship on the bridge of highway bridges at home and abroad, The impact force of the vehicle for the national code are compared and selected a suitable calculation method in the collision analysis. In the calculation, the paper simulate the number of the collision process by adopting finite element dynamic contactSecondly, introduced the numerical analysis methods of the dynamic response of vehicle impact on the bridge; the impact of vehicle on the bridge is a complex nonlinear dynamic response process, the members in the collision area generally will quickly beyond elastic stage into the plastic flow stage, it is necessary to select dynamic concrete constitutive model suitable for collision calculation. In this paper, the model of pier concrete and stone material adopted Colorado concrete power hardening cap material model.Finally, calculated the nonlinear dynamic response of vehicle on crossing bridge of the urban road and highway. In the paper, constructed a three dimensional finite element model of entity. The first is the pier without anti-collision facilities. The second is the pier with the outsourcing concrete anti-collision facilities. The last is the pier with the outsourcing concrete and filler anti-collision facilities. As far as possible simulated the load and displacement boundary conditions conforming to the actual use phase of bridge, idealistically hypothesized the vehicle, analyzed its nonlinear dynamic response.Through analyzing the impact of vehicle on the bridge pier, with the purpose of providing some useful methods to the design of later similar bridges and the structure measures of anti-collision facilities.