Cohesive-frictional interface fracture behavior in soft-brick masonry: experimental investigation and theoretical development

  • Mehar Babu Ravula
  • Kolluru V. L. SubramaniamEmail author
Original Article


An experimental investigation into the shear transfer across the brick mortar interface at different levels of applied pre-compression is reported. Direct shear tests are performed in the triplet test configuration on masonry made with a soft brick. The failure across the brick–mortar interface is progressive and is produced by a crack in the brick–mortar interface. The interface crack propagates in a thin layer where the mortar penetrates the brick. A cohesive-frictional interface relationship which combines progressive cohesive failure with increasing frictional resistance is developed. The maximum shear resistance obtained from the cohesive-frictional relationship follows a Mohr–Coulomb type relationship. The residual frictional resistance increases linearly with an increase in the applied compression.


Masonry Dilation Shear Failure Interface Cohesive Fracture 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© RILEM 2019

Authors and Affiliations

  • Mehar Babu Ravula
    • 1
  • Kolluru V. L. Subramaniam
    • 1
    Email author
  1. 1.Department of Civil EngineeringI.I.T. HyderabadHyderabadIndia

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