Abstract
To explore the possibilities and benefits of using CFRP (Carbon Fibre Reinforced Polymers) in strengthening RC building columns, quasi-static tests (compression and bending) were carried out at the Institute of Earthquake Engineering and Engineering Seismology - IZIIS, Skopje by variation of concrete class, reinforcement percentage and by using various strengthening technologies. Some recommendations and outcomes regarding the approach, technology and conclusions drawn from practical application of these materials, are given. Based on the analysis of values obtained from nonlinear static and nonlinear time history analyses, it can be concluded that the ductility capacity for displacement of model strengthened with CFRP is greater by 60 %, while its strength capacity is greater by 7.7 % when compared to the values obtained for the model without CFRP. It can generally be concluded that CFRP systems are a very practical tool for strengthening and retrofitting concrete structures, as they can extensively improve flexural strengthening, shear strengthening, column confinement, and ductility.
Highlights
IntroductionDespite great advances in this field regarding definition of the technology of construction, control of built-in materials (type of cement, filler, water), transport and layering of concrete, both in the R
Despite great advances in this field regarding definition of the technology of construction, control of built-in materials, transport and layering of concrete, both in the R
Based on the analysis of values obtained from nonlinear static and nonlinear time history analyses, it can be concluded that the ductility capacity for displacement of model strengthened with CFRP is greater by 60 %, while its strength capacity is greater by 7.7 % when compared to the values obtained for the model without CFRP
Summary
Despite great advances in this field regarding definition of the technology of construction, control of built-in materials (type of cement, filler, water), transport and layering of concrete, both in the R. Ample laboratory research for defining characteristics of these materials, and experimental investigations of RC columns strengthened by FRP (Fibre Reinforced Polymers) materials, were carried out [28-34] to provide an original contribution to the possibilities and benefits of the use of these innovative construction materials in strengthening structural elements of buildings and integral building structures. Important aspects of these experimental investigations are presented in this paper. The behaviour of the models exposed to cyclic loads (quasi-static tests) up to failure was investigated by visual monitoring of the occurrence of cracks and development of failure mechanism
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