EXPERIMENTAL AND NUMERICAL STUDY OF STRENGTHENED HINGED FRAMES USING CFRP

Shaaban, Hesham F.

EXPERIMENTAL AND NUMERICAL STUDY OF STRENGTHENED HINGED FRAMES USING CFRP

Document Type : Scientific and technological

Author

Hesham F. Shaaban

Structural Engineering Dept., University of zagazig, Zagazig, Egypt, Canada

Abstract

In this research, a study of strengthened hinged one-storey frames subjected to four-point loading, both experimentally and numerically, is presented. Three full scale hinged frames with dimensions 2400 mm (span) and 1200 mm (height) are tested in this study. The concrete reinforced frames are strengthened using CFRP sheets at locations of sagging and hogging moments. One specimen is strengthened for shear stress, using external CFRP shear laminates, in addition to sagging and hogging moments locations. A non-linear analysis for the tested hinged frames using ANSYS software package is also presented. The strengthened specimens achieved considerable improvement by increasing both; failure load, especially for the third specimen. The results have been confirmed by the proposed numerical model which revealed other important results concerning the strengthening scheme.

Keywords

References

1- ANSYS Element Manual, Tenth Edition, Swanson Analysis System Inc., Pennsylvania, USA.

2- Buyukozturk, O., Gunes, O. and Karca, E., “Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites”, Constr. Build. Mat, (2004), 18(1), p 9-19.

3- El-Shihy, A.M., Fawzy, H.M., Mustafa, S.A. and El-Zohairy, A.A. “Experimental and numerical analysis of composite beams strengthened by CFRP” Steel and Composite Structures, (2010), Vol. 10, No. 3, p 439.

4- Gao, B., Leung, C.K.Y. and Kim, J.K., “Failure diagrams of FRP strengthened RC beams”, J. Compos. Struct., (2005), p 1-16.

5- Gibson, R.F., Principles of composite material mechanics, McGraw-Hill, Inc., New York, (1994).

6- Kaw, A.K., Mechanics of composite materials, CRC Press LLC, Boca Raton, Florida, (1997) .

7- Li, L.J., Guo, Y.C., Liu, F. and Bungey, J.H., “An experimental and numerical study of the effect of thickness and length of CFRP on performance of repaired reinforced concrete beams”, J. Constr. Build. Mat., (2006), 20(10), p 901-909.

8- Pham, H.B. and Al-Mahaidi, R., “Experimental Investigation into Flexural Retrofitting of Reinforced Concrete Bridge Beams using FRP Composites”, Composite Structures, (2004), Vol. 66, No. 1-4, p 617.

9- Shield, C., French, C., and Milde, E., “The effect of adhesive type on the bond of NSM tape to concrete”, Proc. Of FRPRCS-7 Symp., Eds T. Triantafillou, Greece, (2006).

10- Sallam, H.E.M. , Saba, A.M., Shaheen, H.H., and Abdel-Raouf, H., "Prevention of peeling failure in plated beams" J. Adv. Conc. Techn., (2004), Vol. 2, No.3, p 419.

11- Yao, J., and Teng, J.G., " Plate end debonding in FRP-plated RC beams—I: Experiments", Engng. Structure, ASCE, (2007), Vol. 29, p 2457.