滾石撞擊橋墩損傷模型及其參數試驗研究
[Abstract]:In recent years geological disasters such as earthquake debris flow and other geological disasters have caused frequent accidents of rolling stone impact on bridge piers and caused serious harm. How to determine the size of collision force is of great significance to the collision prevention design of bridge piers. Based on the similarity theory, a 1 / 4 scale reinforced concrete model column is designed in this paper. The single pendulum test device is used to carry out the impact test under different impact energy and different working conditions of the impact site, and the numerical simulation is carried out by using LS_DYNA software. The main contents of this paper are as follows: (1) the theory of rolling stone impact pier is summarized, and the main calculation methods and experimental research on the impact force of bridge pier at home and abroad are summarized. The problems to be further studied are put forward. (2) the experimental model of bridge pier is designed and made by using the principle of similarity, and the horizontal impact test is carried out under 12 working conditions, such as three kinds of impact positions with the same section shape and four kinds of impact energy. The time-history curves of impact force, pier top displacement and stress-strain response are obtained by experiments, and some laws of bridge pier collision are obtained, and the formula for calculating impact force is fitted. (3) the finite element model of rolling stone impact pier is established by using LS_DYNA. The pier is numerically simulated under six different load conditions. The experimental data are compared with the simulated results, and the results are in good agreement with each other. It is verified that the numerical model parameters used in this paper can accurately simulate the dynamic response of pier under rolling stone impact load. (4) the influence of impact position and impact height on the impact force is analyzed. The empirical formula for calculating the maximum collision force is proposed by using Origin software to fit the nonlinear formula.
【學位授予單位】:西南科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U445.75
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