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Experimental investigation on the compressive behaviour of FRP‑confined rectangular concrete columns

de Diego Ana, Martínez Sonia, Castro Viviana Jacqueline, Echevarría Luis, Barroso Francisco Javier, Gutiérrez José Pedro

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e131

This paper presents a comprehensive experimental study on the behaviour of FRP-confined concrete in square and rectangular columns and focuses on some issues that might be addressed with a view to improving the predictive models. For this purpose, 31 prismatic concrete specimens with a height of 600 mm and low- and medium-strength concrete (20-35 MPa) were tested under centred compression. The parameters studied were the aspect ratio between the sides of the section (1, 1.5 and 2), the radius of curvature of the corners (20, 25 and 30 mm) and the number of carbon FRP layers applied. The experimental results included stress-strain curves of specimens and detailed information about the confined concrete strength and the axial and lateral strain achieved on the FRP jacket during the tests. The stress-strain response and ultimate condition are analysed, showing that FRP jacketing is an efficient technique for increasing the strength and strain capacity, but that confinement efficiency decreases as the aspect ratio of the section increases. In spite of such decrease, significant strength improvement was achieved for low-strength concrete in rectangular sections with aspect ratios of 1.5 (strength gain up to 81%), and even 2 (up to 36%). The axial strength of the tests was compared with the design criteria of four international guidelines, resulting in predictions that did not properly fit for rectangular sections. A predictive equation is proposed to assess the axial compressive strength of the FRP-confined concrete, which includes a better adjustment for the strain efficiency factor and the shape factor for rectangular columns.

Praca wzmocnionego przekroju żelbetowego

Korentz J.

Przegląd Budowlany

2012

R. 83, nr 2

40-42

Wyniki badań doświadczalnych, jak również wyniki analiz numerycznych pokazują, że bardzo duży wpływ na pracę wzmacnianych belek żelbetowych mają techniki wzmocnienia, a przede wszystkim właściwości mechaniczne materiałów naprawczych. Znajomość zachowania przekroju żelbetowego przed i po wzmocnieniu jest przydatna w odpowiednim wyborze technik i materiałów naprawczych.

This paper presents a study on strengthening of reinforced concrete beams in bending zone. For the purpose of repair and strengthening of reinforced concrete beams, several materials and methods are used such as sprayed concrete, reinforcing bars, steel plate and fibre reinforced polymer (FR P). Several FR P systems are now commercially available for the external strengthening of concrete structures. A numerical analysis using software Xtract was performed to simulate the behavior of strengthened RC sections to estimate an influence of various strengthening method and materials on behavior of RC sections.

Jak to z domieszkami było...

Chandra S.

Budownictwo, Technologie, Architektura

2002

nr 4

54-56