Strength Comparison of Unreinforced Masonry Wall made of Different Types of Brick

Document Type : Regular Paper

Authors

1 Senior Assistant Professor, Civil Engineering, American International University-Bangladesh (AIUB)

2 Graduated Student, Bangladesh University of Engineering and Technology

3 Professor, Civil Engineering, Bangladesh University of Engineering and Technology

4 Graduate Student

Abstract

An attempt has been made in this study to correlate compressive strength, shear strength and wall stiffness for clay burnt bricks with frog mark and machine-made bricks without frog mark. In this experimental study, eight prisms and eight (254 mm) URM wall specimens with a size of 1524 mm X 914 mm were constructed with two different types of bricks, i.e., clay burnt brick with frog mark and machine-made brick without frog mark. Two types of mortar thicknesses 13 mm and 19 mm were used in the test specimens. The prism specimens were tested under axial compression normal to the bed joints and wall specimens were tested under horizontal incremental cyclic loading along with constant axial compressive load. Lateral loading was applied using a loading control pattern. The specimens were tested under cyclic loading conditions displacing them laterally, along the axis of the walls and their load-deformation behavior was measured by dial gauges. It is observed that, increasing mortar thickness prism ultimate strength increases 18.0% for clay burnt brick and with increasing mortar thickness prism ultimate strength increases 1.3% for machine made brick. On the other hand, with the increasing mortar thickness ultimate shear strength decreases 9.6% for clay burnt brick with frog mark and with increasing mortar thickness ultimate shear strength decreases 8.0% for machine made bricks without frog mark. In clay burnt brick shear strength is 12.5% more than machine made brick. Increasing mortar thickness ductility decreases 22.0% for clay burnt brick and 20.0% for machine made bricks.

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History

  • Receive Date: 12 September 2022
  • Revise Date: 27 March 2023
  • Accept Date: 05 July 2023

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