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Experimental and Numerical Investigation of Historic Brickwork Masonry with Weak and Degraded Joints: Failure Mechanisms Under Compression and Shear
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Experimental and Numerical Investigation of Historic Brickwork Masonry with Weak and Degraded Joints: Failure Mechanisms Under Compression and Shear
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Experimental and Numerical Investigation of Historic Brickwork Masonry with Weak and Degraded Joints: Failure Mechanisms Under Compression and Shear
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Journal Article
Experimental and Numerical Investigation of Historic Brickwork Masonry with Weak and Degraded Joints: Failure Mechanisms Under Compression and Shear
2025
Overview
The failure behaviour of historic unreinforced masonry (URM) structures is strongly influenced by the properties of bricks and mortar. Over time, degradation processes compromise these materials, with significant effect on structural response and safety. Nevertheless, deterioration effects on the nonlinear behaviour of masonry have been only marginally investigated. This study investigates the mechanical behaviour and failure mechanisms of historic brick masonry with weak and irregular mortar joints, representative of Mediterranean traditional constructions. An extensive experimental programme was conducted on mortars, historic clay bricks, prisms, wallets, and triplet specimens, complemented by in-situ flat jack tests. Results confirm the critical role of mortar quality and joint irregularities in reducing compressive and shear strength and in influencing deformation capacity of historic masonry. The experimental findings served as a basis for the calibration of a Finite Element Model (FEM), subsequently employed to gain deeper insight into the governing failure mechanisms in a real study case. A critical discussion of compression and shear failure criteria is presented, focusing on historic masonry. Experimental and analytical comparisons show major discrepancies in classical criteria, especially with degraded mortars. The study shows that in historic masonry with weak joints, failure is often governed by compression rather than shear.
