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Unstable Analysis and Collapse Simulation of Frame Construction by Blasting Demolition

Author: PengZuoYu
Tutor: JiangZhaoZuo
School: Ningbo University
Course: Engineering Mechanics
Keywords: Frame structure Blasting Demolition Collapse ANSYS / LS-DYNA Computer simulation
CLC: TU746.5
Type: Master's thesis
Year: 2009
Downloads: 98
Quote: 1
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Abstract


Blasting demolition as a special kind of demolition method, widely used in urban building demolition project. Need to demolish the building more and more with the urban transformation of dismantling height and has become increasingly difficult, at home and abroad in recent years there have been many unsuccessful cases, the main reason is the determination of the parameters of the blasting process blasting often empirical formula based on the characteristics of the building structure demolition principle study was not thorough enough, practice significantly behind the development of theory, the study of the bursting of the demolition of the building is very necessary. In this paper, the blasting demolition collapse mode, mainly Blasting Demolition instability collapse of the framework structure of the building mechanical analysis, based on the finite element method using ANSYS / LS-DYNA computer simulation of the process of building collapse. The frame structure (1) describes the type of building and the load-bearing structure of the power transmission system, the structure of the lateral system and vertical system of mutual support, greatly improve the stiffness and load capacity. According to the frame structure Blasting Demolition different characteristics, combined with the specific case to be re-classified Blasting Demolition of the framework structure of the building collapsed mode, and to study the structure of the instability conditions, frame structure buildings Blasting Demolition mechanical model. (2) combined with blasting demolition collapsed mode common use of kinetic equations to analyze the process of building collapse. Respectively, to study the single dumping cross-frame buildings, multi-level paragraph by paragraph, the disintegration of dumping and frame buildings directional dumping cross-frame buildings, summed up the approximate analytical solution of the collapse process. (3) The application of ANSYS / LS-DYNA frame structure building the blasting demolition collapse process simulation methods and steps. The first solid elements (SOLID164) frame structure model, the framework of the structural characteristics of the building structure, beam overlap processing procedures before processing column connections. Applied gravity keyword * LOAD_BODY_GENERALIZED simulation, failure of the keyword * MAT_ADD_EROSION defined material to simulate the bursting of the formation of the incision, and explain the the simulation often need to add or modify keywords. (4) combined with specific examples using the finite element software ANSYS / LS-DYNA simulation framework structure collapse process, with the actual engineering data a comparative study of the results of simulation analysis of the expected effect of the paper. And the form of framework structure collapsed under different blasting program as well as the factors that affect the simulation results for comparative analysis and simulation results show that does not change the conditions of the other parameters, blasting blasting extension of time different incision height and incision of the explosion stack height, the farthest point distance and collapsed time have a certain impact.

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CLC: > Industrial Technology > Building Science > Construction > Construction Technology > Building maintenance,repair,demolition > Demolition job
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