Experimental Study On The Impact Rolling Stone Bridge Damage Model And Its Parameters

Earthquakes,landslides and other geological disasters in recent years lead to impact rolling stone bridge accidents and caused serious harm,how to determine the size of the collision force of bridge pier anticollision design has important guiding significance.In this paper,based on the similarity theory to design the 1/4 scale model of reinforced concrete column,and through the simple pendulum experiment device of different impact energy and impact tests are carried out under different impact site conditions;At the same time using LS_DYNA software for numerical simulation.The main content of this paper is as follows:(1)Overview of the theory of rolling impact piers and summarized the main calculation method of impact force of piers and test research,put forward the further research problems.(2)Using the similar principle design and production of the bridge test model,and the three impact location,at the same cross section shape of four impact energy level the impact test of 12 kinds of working conditions.Impact force is obtained by experiment,the pier top displacement and stress-strain response time history curve,analysis the rule of the some of the bridge pier collision.(3)Using LS_DYNA rolling stone hit bridge finite element model is established,on the bridge pier under 12 different loading conditions are simulated.Tested value compared with the value simulation,the results are in good agreement,verify the numerical model parameters are adopted in this paper can accurately simulate piers on the dynamic response under the impact load and the Rolling Stones test results can be impact force formula fitting.(4)Analysis of the impact area and the height of the impact on the effect of impact force,Origin software was used to nonlinear fitting formula,empirical formula for calculating maximum collision force is presented.