Abstract
This paper describes methods, procedures, and results of cyclic loading tensile tests of a PBO FRCM composite. The main objective of the research is the evaluation of the effect of low- and high-cycle fatigue on the composite tensile properties, namely the tensile strength, ultimate tensile strain, and slope of the stress–strain curve. To this end, low- and high-cycle fatigue tests and post-fatigue tests were performed to study the composite behavior when subjected to cyclic loading and after being subjected to a different number of cycles. The results showed that the mean stress and amplitude of fatigue cycles affect the specimen behavior and mode of failure. In high-cycle fatigue tests, failure occurred due to progressive fiber filaments rupture. In low-cycle fatigue, the stress–strain response and failure mode were similar to those observed in quasi-static tensile tests. The results obtained provide important information on the fatigue behavior of PBO FRCM coupons, showing the need for further studies to better understand the behavior of existing concrete and masonry members strengthened with FRCM composites and subjected to cyclic loading.
Highlights
The 2030 Agenda and its Sustainable Development Goals are determining a distinctive change in route for the construction sector [1]
The hybrid PBO-Glass fiber-reinforced cementitious matrix (FRCM) composite investigated in this paper was constituted of one layer of textile embedded between two layers of a cement-based matrix, each 5 mm thick [20]
The average tensile strength σfu, ultimate strain εfu, and elastic modulus Ef of the PBO textile in longitudinal direction were obtained by tensile testing of nine 50 mm wide and 400 mm long bare textile strips, according to the indication of the European Assessment Document (EAD) for FRCM composites [22]
Summary
The 2030 Agenda and its Sustainable Development Goals are determining a distinctive change in route for the construction sector [1]. Besides the traditional focus on new constructions, strengthening, retrofitting, and revalorization of existing structures is gaining increasing importance. Within this field, a fundamental role is played by the employment of low environmental impact and durable materials, which shall guarantee quality, durability, and sustainability of the applications. A fundamental role is played by the employment of low environmental impact and durable materials, which shall guarantee quality, durability, and sustainability of the applications Among these materials, fiber-reinforced inorganicmatrix composites, which are comprised of non-metallic high-performance fiber textiles embedded within inorganic matrices, are a valid solution for strengthening and retrofitting existing masonry and concrete members. Bonded (EB) FRCM are a lightweight, non-invasive, durable, and cost-efficient strengthening/retrofitting solution, reportedly effective in increasing the bearing and displacement capacity of structural members and reducing the crumbling/overturning hazard of non-structural members [8,9,10,11,12,13]
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