Abstract
The article discusses the effect of transverse reinforcement spacing for the strength and deformation characteristics of beams with glass fibre reinforced polymer. The bending tests results of reinforced concrete specimens are presented (GFRP) with different concrete strength and reinforcement spacing. Force-deflection, force-GFRP bars deformation and force-concrete compressed zone deformation dependencies are given in the article. Based on ultimate force and beams destruction pattern it is established that increasing transverse reinforcement spacing reduces the beams strength and leads to destruction in oblique section. With narrow-mashed transverse reinforcement fracture occurs in the compressed zone of concrete. A computational analysis for different types of beams fracture is presented. It is established that transverse reinforcement spacing doesn’t affect the parameters determined by service limit state: crack formation load, crack width and beam deflection. A comparative analysis of maximum permissible deflection based on test results and theoretical calculations was carried out. The numerical values of bending stiffness parameter are obtained at the loading stages with linear deformation before and after first crack formation.
Highlights
Glass-fiber reinforced polymer (GFRP) bars market in Russia has increased drastically in the last years
Crack developing in concrete through the GFRP bars and active formation of oblique cracks was seen on chart for oblique routes with load changing from 8 to 30 kN
Beam fracture with 50 mm spacing in transverse reinforcement occurred in concrete in the pure bending zone at average load of Pu=97,5 kN
Summary
Glass-fiber reinforced polymer (GFRP) bars market in Russia has increased drastically in the last years. Many necessary regulatory documents for GFRP bars and instructions for reinforced with GFRP structure design have been developed and constituted in Russia [1],[2],[3],[4],[5]. There is an increase in industrial and civil structures designed with the use of GFRP bars. It is not advised to use GFRP as a working reinforcement for bending structures due to lack of experimental data. It is not wise to neglect tensile properties of GFRP bars. Some Russian and foreign researches of bending elements reinforced with GFRP showed good results [6],[7],[8],[9]
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