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Blockwork Wall

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Mahachi J. – One of the best experts on this subject based on the ideXlab platform.

  • Limiting structural damage on masonry structures due to foundation movement
    , 2019
    Co-Authors: Mahachi J.

    Abstract:

    Abstract: Over three million low-income houses have been built in the Republic of South Africa over the last two decades, many of which have experienced structural distress due to foundation movement or poor quality construction. The South African low-income housing sector employs a large number of entry-level ma- terial suppliers and building contractors, and this results in substantial variability of construction materials, technology and workmanship standards. Underpinning the foundation as a remedial solution to low-income houses is very expensive compared to the actual cost of the product (i.e. the house). Alternatively, it may be cost effective to demolish and rebuild the structure. In this paper, cost effective alternative to underpinning is explored using a proprietary type of reinforcement which is grouted to concrete Blockwork. The reinforcement and grout act compositely with existing concrete Blockwork, both to repair the cracks and to form deep rein- forced masonry beams. This paper covers the initial test programme to investigate and assess the suitability of different reinforcement systems to improve the structural strength and performance of concrete Blockwork Wall– ing systems. A series of tests were conducted on Blockwork Wall sections above window and door openings. The material specimens used for the investigation were sampled from a number of construction sites where the quality of the materials varied from site-to-site. The results of the tests showed strength enhancement of the Blockwork and an improved ductility

H. Salehi – One of the best experts on this subject based on the ideXlab platform.

  • Finite-Element-Based Monte Carlo Simulation for Sandwich Panel-Retrofitted Unreinforced Masonry Walls Subject to Air Blast
    Arabian Journal for Science and Engineering, 2019
    Co-Authors: B. Zehtab, H. Salehi

    Abstract:

    In this paper, the behavior of three types of masonry Walls is assessed subject to blast load as an out-of-plane impulse origin, and they are strengthened by the sandwich panel. The values of displacement and von Mises stress caused by blast loads are calculated using finite-element simulation. The modeled masonry Walls are constructed using brick, grouted concrete masonry unit and ungrouted concrete masonry unit. Blast load is modeled by means of the CONWEP (conventional weapon) tool. A reliability analysis is conducted to evaluate outputs statistically and to calculate failure probabilities using Monte Carlo method. Plasticity properties of masonry and steel materials are simulated using concrete damage plasticity and Johnson–Cook (JK) models, respectively. Blast load is applied in three different levels of mild, moderate and severe. Results show that sandwich panel strengthening can efficiently reduce the stress and displacement values for all masonry Wall types. Probabilities of failure in strengthened masonry Walls are significantly decreased. Moreover, in non-strengthened cases, grouted Blockwork Wall has a lower stress and displacement comparing to the other masonry Walls.

B. Zehtab – One of the best experts on this subject based on the ideXlab platform.

  • Finite-Element-Based Monte Carlo Simulation for Sandwich Panel-Retrofitted Unreinforced Masonry Walls Subject to Air Blast
    Arabian Journal for Science and Engineering, 2019
    Co-Authors: B. Zehtab, H. Salehi

    Abstract:

    In this paper, the behavior of three types of masonry Walls is assessed subject to blast load as an out-of-plane impulse origin, and they are strengthened by the sandwich panel. The values of displacement and von Mises stress caused by blast loads are calculated using finite-element simulation. The modeled masonry Walls are constructed using brick, grouted concrete masonry unit and ungrouted concrete masonry unit. Blast load is modeled by means of the CONWEP (conventional weapon) tool. A reliability analysis is conducted to evaluate outputs statistically and to calculate failure probabilities using Monte Carlo method. Plasticity properties of masonry and steel materials are simulated using concrete damage plasticity and Johnson–Cook (JK) models, respectively. Blast load is applied in three different levels of mild, moderate and severe. Results show that sandwich panel strengthening can efficiently reduce the stress and displacement values for all masonry Wall types. Probabilities of failure in strengthened masonry Walls are significantly decreased. Moreover, in non-strengthened cases, grouted Blockwork Wall has a lower stress and displacement comparing to the other masonry Walls.