Simply Supported Girder Bridge Piers In The Numerical Simulation Of The Impact

Debris flow is the most common natural disaster in the mountainous area, in our country, mountainous area is nearly accounted for 70% of the land area. Debris flow in our country, especially in the northwest region distribution is very wide, causing very serious disasters, bring great influence on people’s lives. In recent years, along with the rapid development of the economy and the rapid development of road construction, the frequency of the occurrence of debris flow disasters in the highway、railway bridge, culvert and other engineering structures also increased. Bridge as an important component of road construction, and the pier is the first contact with debris flows, once the impact of the destruction, will inevitably lead to the stagnation of the traffic system, causing huge economic losses. So, in order to ensure the system of traffic smooth, people’s life safety and reduce the damage of bridge under the action of debris flow, analyzing and studying the influence of debris flow under the action of impact piers have very important significance. In this paper, the research on the performance of the simple supported beam bridge piers under the impact of debris flow and the protective measures are analyzed.First of all, the structure and related parameters of steel bar and concrete materials needed for the research of this subject are selected. Considering the contact between steel bar and concrete, boundary condition setting and materials to determine the yield criterion, the use of nonlinear finite element software ABAQUS to establish reinforced concrete bridge pier speed impact test model, analysis of the impact site concrete displacement time history curve and concrete and steel strain curve selection, experimental results are compared with the existing, indicating that the validity of the simulation results.Then, the ABAQUS software was used to establish a simple supported beam bridge model, to simulate the impact mechanism of debris flow on bridge piers, and to analyze the impact, stress, deformation,energy. and the response analysis of bridge overall after impact effect. By changing the relevant parameters, the main factors influencing the impact of reinforced concrete bridge piers are studied.Finally, by studying the response of the pier by the debris flow impact and the failure mechanism of the bridge,and summarizing the debris flow of simple supported beam bridge pier protective measures,and comparing the advantages and disadvantages of different protection method, I can put forward a kind of protection relative economic way against mountainous area small and medium sized beam bridge.