Y. S. Korany¹ and R. G. Drysdale²

1. NSERC Post-doctoral Fellow, Center for Infrastructure Engineering Studies, University of Missouri-Rolla 223 Engineering Research Lab., Rolla, Missouri 65409-0710, yasser.korany@gmail.com
2. Professor & Martini, Mascarin and George Chair in Masonry Design Director, Centre for Effective Design of Structures, Department of Civil Engineering, McMaster University, 1280 Main St. W., Hamilton, ON L8S 4L7, drysdale@mcmaster.ca

ABSTRACT

Unobtrusive FRP rehabilitation techniques were developed to enhance the out-of-plane flexural resistance of masonry wall panels by increasing their ability to absorb energy. In these techniques, unbonded and intermittently bonded FRP reinforcement were used to produce higher rotations and, consequently, large displacements. Experimental and analytical investigations were conducted to evaluate the effectiveness of the developed FRP rehabilitation techniques. Without a design approach available for practitioners, the full potential of these techniques would be hard to realize.

In this paper, a simplified design methodology for calculating the capacity of this type of FRPreinforced masonry wall panel under out-of-plane pressure is described. The proposed method is based on an analytical model that was developed to predict the post-cracking lateral pressuredisplacement response under biaxial bending. The conservation of energy principle is applied to determine the capacity whereas displacement is calculated from rotations employing rigid body mechanics. The resulting wall sub-panels, subsequent to a fully developed crack pattern, are considered to behave as rigid segments that rotate around crack lines. The applicability of the design method is demonstrated by a numerical example.

KEYWORDS: wall panels, out-of-plane resistance, fibre reinforced polymers, unbonded reinforcement, intermittently bonded reinforcement, rigid-body mechanics

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