Numerical Simulation And Application Of Demolition Blasting Collapse Process Of High Rise Building

In response to the national energy-saving emission reduction, large pressure small policy, eliminate backward production capacity, many power plants in the hyperbolic cooling tower will be blasting demolition. Cooling tower due to space hyperbola shape and reinforced concrete structure of the two distinctive features, resulting in the demolishing blasting notch form diverse selection is difficult, instability and collapse of high difficulty, difficulty in precise orientation, collapse scope and effect is difficult to predict etc. problem.Numerical simulation of cooling tower demolition demolition process lots of rehearsals and predict the blasting effect, for the design of blasting scheme provides beneficial reference and optimization of blasting parameters. This paper introduces the functions, characteristics and advantages of the ANSYS/LS-DYNA finite element software, as well as the advantages of the finite element method, and the mechanical properties of reinforced concrete materials are simulated by using the common node separation model.This paper to a power plant in the hyperbolic cooling tower blasting demolition engineering. Because of the complexity of the surrounding environment, to be protect many objects and owners required explosion stack height of not more than 5m and other technical difficulties, to obtain good blasting effect and strictly control the collapse range, using ANSYS / LS-DYNA on its blasting demolition established six different blasting cut height and the delay time of the finite element model, the scheme collapsed, the collapse range, blasting pile height simulation results comparative analysis, study different blasting cut height and delay time of collapse and explosion influence of pile height, it is concluded that the following conclusions:1, blasting cut height is high, its collapsing faster, and the disintegration of the touchdown crushing effect is good, but ignores the touchdown vibration also increases;2, reasonable blasting delay time to ensure that the sequence of the destruction of the tower wall, wall column in the air collision, extrusion, distorted deformation role fully, velocity of the cooling tower collapsed in a certain extent to delay action.3, in the cooling tower in the design direction of the collapse of the deflection of the case, the blasting cut height and initiation delay time on the impact of the width of the collapse is very small.