Int. J. Advanced Structures & Geotechnical Engineering

 

ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 05 NO. 03 JULY 2016:

Title:     Effect of Pre-compression and Mortar Ratios on the In-Plane Shear Strength of Unreinforced Brick Masonry
Authors:    Naveed Ali, Muhammad Ashraf, Haris Alam, Fasih Ahmed Khan
Abstract:  This paper aims to study the In-plane shear strength of unreinforced brick masonry. Under lateral loads i.e. earthquake, wind, floods etc., it is commonly the walls that tend to undergo shear failure in most of the cases. The failure corresponding to these lateral loads during earthquake can be purely shear if the mortar is weak. Mortar is playing an important role in resisting lateral loads by inducing friction in presence of vertical precompression. Due to the importance of mortar, various mortar ratios are tested to find the effect of mortar ratios on the shear resisting properties of unreinforced brick masonry. Similarly, the frictional component of shear strength depends on vertical stresses, therefore, four different precompression levels are also selected and used. Standard brick unit prevalent in Pakistan is considered, similar to units that can be found also in neighboring countries like India, Iran and Bangladesh amongst others. The results showed that by using rich mortar helps in increasing the shear strength as compared to lean mortar. Four different mortar ratios are used which are common in construction of masonry structures. 12 samples each of 4 mortar ratios are tested. The shear strength parameters i.e. cohesion and coefficient of friction are monitored and observed and are related to the compressive strength of mortar as well as the mortar ratio. Empirical correlations are developed, which can be used for shear design of unreinforced masonry.

Keywords:  Shear, Shear Strength, Compression, Mortar, Unreinforced Brick Masonry.
Pages:         78-82

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