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논문 기본 정보

자료유형
학술저널
저자정보
Saja Waleed Fathuldeen (Al-Nahrain University) Musab Aied Qissab (Al-Nahrain University)
저널정보
국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.70 No.1
발행연도
2019.1
수록면
67 - 80 (14page)

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Strengthening with near surface mounted carbon fibre reinforced polymers (NSM-CFRP) is a strengthening technique that have been used for several decades to increase the load carrying capacity of reinforced concrete members. In Iraq, many concrete buildings and bridges were subjected to a wide range of damage as a result of the last war and many other events. Accordingly, there is a progressive increase in the strengthening of concrete structures, bridges in particular, by using CFRP strengthening techniques. Near-surface mounted carbon fibre polymer has been recently proved as a powerful strengthening technique in which the CFRP strips are sufficiently protected against external environmental conditions especially the high-temperature rates in Iraq. However, this technique has not been examined yet under repeated loading conditions such as traffic loads on bridge girders. The main objective of this research was to investigate the effectiveness of NSM-CFRP strips in reinforced concrete beams under repeated loads. Different parameters such as the number of strips, groove size, and two types of bonding materials (epoxy resin and cement-based adhesive) were considered. Fifteen NSM-CFRP strengthened beams were tested under concentrated monotonic and repeated loadings. Three beams were non-strengthened as reference specimens while the remaining were strengthened with NSM-CFRP strips and divided into three groups. Each group comprises two beams tested under monotonic loads and used as control for those tested under repeated loads in the same group. The experimental results are discussed in terms of load-deflection behavior up to failure, ductility factor, cumulative energy absorption, number of cycles to failure, and the mode of failure. The test results proved that strengthening with NSM-CFRP strips increased both the flexural strength and stiffness of the tested beams. An increase in load carrying capacity was obtained in a range of (1.47 to 4.49) times that for the non-strengthened specimens. Also, the increase in total area of CFRPs showed a slight increase in flexural capacity of (1.02) times the value of the control strengthened one tested under repeated loading. Increasing the total area of CFRP strips resulted in a reduction in ductility factor reached to (0.71) while the cumulative energy absorption increased by (1.22) times the values of the strengthened reference specimens tested under repeated loading. Moreover, the replacement of epoxy resin with cement-based adhesive as a bonding material exhibited higher ductility than specimen with epoxy resin tested under monotonic and repeated loading.
#NSM CFRP #epoxy resin #cement based adhesive #flexural repeated loading #reinforced concrete beams #ductility factor

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참고문헌 (26)

참고문헌 신청
2014 / ACI Committee 318, Building Code Requirements for Structural Concrete, (ACI 318M-14) and Commentary (318R14) google schola 2008 / ACI Committee 440, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures / American Concrete Institute google schola Aidoo, J. / 2004 / Fatigue behavior of carbon fibre reinforced polymer-strengthened reinforced concrete bridge girders / J. Compos. Constr 8(6):501~509 google schola Al-Abdwais, A. / 2016 / Bond behavior between NSM CFRP laminate and concrete using modified cement-based adhesive / Constr. Build. Mater 127(1):284~292 google schola Al-Abdwais, A. H. / 2017 / Bond properties between carbon fibre reinforced polymer(CFRP)textile and concrete using modified cement-based adhesive / Constr. Build. Mater 154:983~992 google schola

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