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Mechanism Analysis of Masonry Buildings with Bottom Frames under Blast Loading

Author: WangZhongZuo
Tutor: TianYuBin
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: masonry buildings with bottom frames blast load progressive collapse ANSYS/LS-DYNA
CLC: O383.2
Type: Master's thesis
Year: 2008
Downloads: 85
Quote: 1
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Abstract


Because of the simplification and assumption taken in the numerical analysis, current method in the numerical analysis of the masonry buildings with bottom frames progressive collapse might not give an accurate and reliable prediction of the process of structural progressive collapse. In this paper, on the base of many references, numerical simulations of blast load acting on the masonry buildings with bottom frames using ANSYS/LS-DYNA are carried out. The main work of this thesis can be summarized as follows:In this paper, a general introduction is made about explosion and explosion protection in the past and at present, and this paper also lays a foundation for the following work.The three dimensional model of masonry buildings with bottom frames and seven-storey was set up with explicit dynamic analytical software LS-DYNA. GSA criteria analysis method was carried out in the numerical analysis of the masonry buildings with bottom frames progressive collapse. There are some disadvantages of GSA criteria analysis method in the aspect of the simulative truth, so Two-stage analysis method was created against the disadvantages of GSA criteria analysis method for the first time in this paper, and this method was carried out in the numerical analysis of masonry buildings with bottom frames progressive collapse. Finally, the results of GSA criteria analysis method and Two-stage analysis method were compared, and the differences of these two methods and the advantages of Two-stage analysis method were mentioned. The structural damage was local, and the local damage was the reason why the progressive collapse of the structure happened. If we used some countermeasures to prevent the structural local damages, the progressive collapse of the structure may not happen. The conclusions mentioned upwards have the guiding significance for the application of explosion-proof measures.The stress of the structural elements in the 2th storey of masonry buildings with bottom frames is higher than that in other storeies. So in this paper, the destruction process which was provoked by explosive shock wave acting on the second storey of the masonry buildings with bottom frames was simulated by using transient dynamics analysis of ANSYS/LS-DYNA. By using the advantage of the numerical analysis, the masonry material strength grade, the reinforced ratio of the vertical bar, GFRP strengthening, steel plate strengthening, arrangement of columns, wall opening and building storey number of the bottom frames are changed to analyze the model. The dynamic response laws and destructive condition of the masonry buildings with bottom frames which the explosive shock wave acted on can be got. The rule of the stress and the displacement of the masonry and reinforcing bars can be got at the same time. All these works offer the theoretical principle and meritorious reference data for antidetonation design about masonry buildings with bottom frames.

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CLC: > Mathematical sciences and chemical > Mechanics > Explosion > The interaction of blast wave and the object > The role and protection of the blast wave on a variety of buildings
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