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Experimental and Numerical Analysis of Pakistan Brick Masonry Structure

Author: FengYanMing
Tutor: DaiJunWu
School: China Seismological Bureau, Institute of Engineering Mechanics
Course: Structural Engineering
Keywords: Masonry structure Cyclic Loads Nonlinear Brick Mortar
CLC: TU364
Type: Master's thesis
Year: 2008
Downloads: 163
Quote: 2
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Abstract

2005 Kashmir earthquake led to the death of more than 79,000 people, the earthquake occurred in one of the worst natural disasters in Pakistan and the Indian subcontinent. Most of the buildings collapsed in the earthquake is a masonry structure. The poor quality of construction and unreasonable design is the main reason for the collapse of the structure, it is necessary to take effective measures to improve the seismic performance of masonry structures in the region. Based on the above, commissioned by the University of Peshawar, Pakistan, China Seismological Bureau, Institute of Engineering Mechanics brickwork seismic performance of pseudo-static test, the paper is a summary and analysis of the test. Firstly, the basic mechanical properties on the the Pakistani traditional masonry brickwork member compression, shear test, on the one hand, to obtain in-depth knowledge of the traditional Pakistani brick destruction process, on the other hand is verified related component mechanical properties of brick masonry analysis theory. After the walls with nonlinear failure process analysis and summary of test results on the basis of the two methods for the numerical simulation. This paper can provide valuable test data, the brickwork structure seismic research in Pakistan can also provide a reference for the process of numerical simulation of the nonlinear failure of existing brickwork structure analysis. The main results obtained by the study are as follows: 1. This article by referring to the large body of literature, indicating that the brick structure Research. Briefly brick masonry structure the course of development and brickwork structure research methods. By pseudo-static test, the nonlinear failure of Pakistan's traditional masonry masonry components under cyclic loading process. Test results show that the traditional Pakistani brick masonry subjected to axial compression, due to the different deformation capacity of mortar and bricks, often due to the bricks which led to the destruction of the brickwork structure tension cracking. Brick masonry shear tests found that positive pressure is an important factor affecting the shear strength of brick masonry. Also pointed out that the the brickwork member deformation under loads from the deformation of the mortar between the bricks. Test found that the tensile strength of brick masonry walls with destruction under the action of shear pressure is neither traditional theory that the mere result of mortar and the maximum tensile stress caused by destruction, nor purely due to the mortar between the bricks the friction can not resist external force caused by shear friction damage, but the combination of both destruction by the maximum tensile stress to the shear mode failure modes in the form of a gradual transition process. Under the action of shear pressure Walls destruction process can be divided into three stages: (a) Walls cracking or micro-crack stage, the cracking of the walls with mortar principal tensile stress exceeds the tensile strength; (b ) walls with cracking but not completely through the stage, the expansion of the walls with cracks caused by not cracking tensile strength of mortar and of cracking mortar and bricks friction is less than the dual role; (c) cracks completely through the stage, The wall film relies entirely on the the shear friction effect of the mortar and bricks resistance level of external force, so this stage of crack propagation is caused due to the lack of friction of mortar and bricks. 6 In this paper, the summary of the test based on the work of others, using integrated model and separate model and the finite element numerical simulation of the nonlinear failure process test wall piece. The results of the simulation showed that, overall numerical simulation method is relatively simple, but the deviation is increasing with the deepening of brick masonry walls with damage simulation results, separate numerical simulation method is tedious and time-consuming, but the simulation results and the actual test results than close.

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