Debris Flow Under The Shock Load Of Reinforced Concrete Landang Dam Dynamic Response Analysis

At present, the debris flow gravity obstruct dam is according to the design of the debris flow disaster prevention engineering design, namely a similar method of retaining wall design, will be the impact of debris flow load as a static load on the reinforced concrete obstruct dam, thus statics analysis and debris flow impact load is dynamic loading. This article adopts the method of structural dynamics, debris flow impact load is established and the dynamic equation of reinforced concrete obstruct dam, analyzes the dynamic response of obstruct dam.(1) This paper introduces the basic characteristics of impact load and typical debris flow impact load, according to the nature of the impact load and the particularity of debris flow impact load, and finally selects the rectangular pulse, half sinusoidal pulse and triangular pulse three pulse impact load as the debris flow impact load, and assumes their mathematical expressions.(2) Because of the cross section of reinforced concrete debris flow obstruct dam is irregular; the complexity of geometric shape as well as to the feasibility of the model, this paper introduces a lot of reasonable assumptions. On this basis, establishes the reinforced concrete debris flow obstruct in debris flow under the shock load of partial differential equations. Use the variable separation method in mathematical physics equation has been reinforced concrete debris flow obstruct under free damping movement of the Eigen values of the partial differential equation, the characteristic function, and the equation of the analytical solution, for the back of the reinforced concrete obstruct dam forced damping movement is established.(3) Obstruct reinforced concrete dam are studied respectively in three kinds of pulse impact load, namely in the rectangular pulse load, half sine pulse load and triangular pulse loads, using the mathematical physics equations of characteristic function method and modal superposition method of structural dynamics has been reinforced concrete obstruct dam forced damping motion under the analytical solution of displacement. The analytical solution is a series of mathematics, but for practical engineering problems, based on general experience, coefficient in the first three series, can satisfy the requirement of the engineering precision.(4) Select the typical engineering and related parameters, generation into the analytical solution to the equation, and then using the MATLAB software to analytical solution were analyzed and solving, in the final is verified by finite element software MIDAS.