In-plane shear cyclic behavior of windowed masonry walls reinforced with textile reinforced mortars. (1st January 2021)

• Record Type: Journal Article
• Authors: Ivorra, Salvador; Torres, Benjamín; Baeza, F. Javier; Bru, David
• Is Part Of: Engineering structures. Volume 226(2021)
• Publication Date: 2021-01-01
• Subjects: Cyclic loads -- Masonry -- Textile Reinforced Mortar (TRM) -- Fiber Reinforced Cementitious Matrix (FRCM) -- Digital Image Correlation (DIC); Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.111343
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The mechanical capacity of TRM reinforced wall was increased an average of 204%. The energy dissipation capacity for small displacements (<1 cm) was higher in the unreinforced masonry. The higher ductility related to the TRM was also observed in the cumulative energy loss. TRM reinforcement could guarantee the structural stability, preserving at least 40% of the initial stiffness even after suffering a 30 mm drift. TRM layers also modified the cracking pattern. Abstract: The current experimental study is focused on the mechanical performance of masonry walls under in-plane cyclic shear forces. All specimens were fabricated with a central window, in which the geometry considered the recommendations of the Spanish structural seismic design code. Windows represent a weak area in the masonry structure, in which there are stress concentrations responsible for crack initiation. In order to improve the mechanical strength and ductility, a reinforcement with a Textile Reinforced Mortar (TRM) was used on both sides of the wall. The performance of the unreinforced and reinforced masonry has been discussed in terms of strength and ductility gain, stiffness degradation and energy dissipation capacity. The experimental tests comprised an initial vertical preload, and shear cycles with increasing amplitude. All tests were monitored by means of traditional displacement transducers, and digital image correlation. The analysis of the images showed the time evolution of the overall crack distribution. The TRM effect could be observed as an increase of the mechanical strength (maximum shear from 120 kN to more than 300 kN), higher displacements (drift from 9 to 35 mm), and more energy dissipation (the cumulative energy loss from 2.7 to 12.7 kN·m). In addition, the TRM reinforcements were capable of controlling the crack initiation and growth. The widespread crack along mortar joints observed in the unreinforced masonry became localized cracks (from the window's corners mainly), in which crack growth direction was not determined by masonry joints.