Cyclic shear-compression testing of brick masonry walls repaired and retrofitted with basalt textile reinforced mortar

The use of Textile Reinforced Mortar (TRM) systems represent a valid alternative to traditional strengthening techniques, to improve mechanical strength and seismic performance of masonry buildings. Their effectiveness has been validated by several studies [1-4]. However, the TRM contribution in the mechanical behavior of masonry walls, subjected to simple compression, has not yet been fully investigated. In this study, an experimental campaign with the objective of studying the efficiency of TRM systems, applied to clay brick masonry panels, is presented. Compression tests were conducted on clay brick masonry panels with dimensions of 250x1000x1200 mm3. Glass fiber bidirectional fabrics were applied on both sides of the panels, coupled with lime-based mortar, and connected with stainless steel helical connectors. The total thickness of the reinforcement system is 30 mm. The effect of the TRM reinforcement on the mechanical behavior of the panel is analyzed and experimental results are compared with those of unreinforced panels in terms of ultimate strength and failure modes.

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Numerical analysis of the load-bearing capacity of brick masonry walls strengthened with textile reinforced mortar and subjected to eccentric compressive loading

Engineering Structures ◽

10.1016/j.engstruct.2015.02.032 ◽

2015 ◽

Vol 91 ◽

pp. 96-111 ◽

Cited By ~ 27

Author(s):

Ernest Bernat-Maso ◽

Lluis Gil ◽

Pere Roca

Keyword(s):

Numerical Analysis ◽

Bearing Capacity ◽

Compressive Loading ◽

Brick Masonry ◽

Masonry Walls ◽

Load Bearing Capacity ◽

Load Bearing ◽

Textile Reinforced Mortar

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In-Plane Behavior of Plain and Strengthened Solid Brick Masonry Walls

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.747.694 ◽

2017 ◽

Vol 747 ◽

pp. 694-701 ◽

Cited By ~ 1

Author(s):

Mustafa Hrasnica ◽

Fadil Biberkic ◽

Senad Medic

Keyword(s):

Shear Failure ◽

Numerical Models ◽

Brick Masonry ◽

Full Scale ◽

Physical Models ◽

Experimental Program ◽

Masonry Walls ◽

Cyclic Shear ◽

Lightweight Structures ◽

Seismic Forces

Unreinforced masonry structures are generally vulnerable to earthquake actions. Brittle masonry walls are very stiff and attract considerable seismic forces which cannot be sustained without cracking. In order to enhance ductility and load bearing capacity, certain strengthening techniques need to be applied. An experimental program concerning in-plane behavior of solid clay brick masonry walls was performed at the Institute for Materials and Structures, Faculty of Civil Engineering University of Sarajevo, in cooperation with Institute for Lightweight Structures and Conceptual Design, University of Stuttgart. The physical models include two unconfined unreinforced full scale masonry walls L/H/D=233/237/25cm and two strengthened full scale walls jacketed on both sides with 5cm thick concrete and reinforced with Q196 steel mesh. Twelve reduced scale walls L/H/D = 100/100/25cm were additionally constructed in order to test different strengthening methods which include one-or two-sided jacketing and CFK 150 strips. Specimens were exposed to cyclic shear as well as to monotonic push over loading program for different vertical stress levels with the aim to quantify shear strength, stiffness and energy dissipation. For lower vertical loads the tested walls exhibit rigid body rotation in each displacement cycle. For higher precompression mixed flexural and shear failure mode was registered, characterized by toe crushing and diagonal cracking. No separation of jacketing from the masonry was detected. Numerical models of tested wall panels were developed using finite element programs.

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Experimental Study of Brick Masonry Walls Strengthened with Textile Reinforced Mortar

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.624.397 ◽

2014 ◽

Vol 624 ◽

pp. 397-404 ◽

Cited By ~ 1

Author(s):

Ernest Bernat-Maso ◽

Pere Roca ◽

Lluís Gil

Keyword(s):

Brick Masonry ◽

Masonry Walls ◽

Testing Device ◽

Load Bearing Capacity ◽

Load Bearing ◽

Experimental Campaign ◽

External Reinforcement ◽

Initial Load ◽

Buckling Failure ◽

Textile Reinforced Mortar

The paper presents an experimental research on the use of Textile Reinforced Mortar (TRM) for the strengthening of brick load bearing masonry walls subjected to eccentric loading. Particular attention is given to the case of slender walls and to the ability of TRM reinforcement to enhance the response of such walls against buckling failure. The research has allowed the study of the influence of different mortar and fibre grid types and the possible benefit of using anchors to improve the connection between the walls and the external reinforcement. The experimental campaign has consisted of twelve tests on full scale wall specimens using a specific testing device designed to create a hinged boundary condition at the top and bottom wall ends. It has been observed that TRM reinforcement provides a significant increase of over 100% of the initial load bearing capacity under eccentric axial load. Moreover, a stiffer and more homogeneous behavior is noticed when TRM is applied. A simplified analytical method to calculate the ultimate axial-bending combination for TRM strengthened brick masonry walls, in agreement with the experiments, is also presented.

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Strengthening Brick Masonry by Repointing – An Experimental Study

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.624.444 ◽

2014 ◽

Vol 624 ◽

pp. 444-452 ◽

Cited By ~ 7

Author(s):

Matija Gams ◽

Miha Tomaževič ◽

Arkadiusz Kwiecień

Keyword(s):

Experimental Study ◽

Elastic Modulus ◽

Brick Masonry ◽

The Other ◽

Masonry Walls ◽

Cyclic Shear ◽

Flexible Polymer ◽

Steel Bar ◽

Low Elastic Modulus ◽

Strengthening Technique

The results of an experimental study aimed at seismic strengthening of brick masonry walls by the use of repointing and reinforcing bed joints are presented. Within the testing campaign eight walls were tested by cyclic shear. Two of the walls were used as control walls, whereas the other six walls were strengthened. Two kinds of mortar were used for repointing and steel and GFRP materials were used for reinforcement. In case of one wall, reinforcement was laid into a flexible polymer in order to distribute the stresses in the steel bar to a larger area. The tests indicate that repointing can be a very successful strengthening technique. Best results were obtained in case of repointing by mortar with low elastic modulus and steel reinforcement.

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