Optimal FRP Jacket Placement in RC Frame Structures Towards a Resilient Seismic Design

G. Mahdavi, K. Nasrollahzadeh and M. A. Hariri-Ardebili
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G. Mahdavi: Department of Civil and Architectural Engineering and Mechanics, University of Arizona, Tucson, AZ 85721, USA
K. Nasrollahzadeh: Department of Civil Engineering, K. N. Toosi University of Technology, Tehran 19697, Iran
M. A. Hariri-Ardebili: Department of Civil Environmental and Architectural Engineering, University of Colorado, Boulder, CO 80309, USA

Sustainability, 2019, vol. 11, issue 24, 1-22

Abstract: This paper proposes an optimal plan for seismically retrofitting reinforced concrete (RC) frame structures. In this method, the columns are wrapped by fiber-reinforced polymer (FRP) layers along their plastic hinges. This technique enhances their ductility and increases the resiliency of the structure. Two meta-heuristic algorithms (i.e., genetic algorithm and particle swarm optimization) are adopted for this purpose. The number of FRP layers is assumed to be the design variable. The objective of the optimization procedure was to provide a uniform usage of plastic hinge rotation capacity for all the columns, while minimizing the consumption of the FRP materials. Toward this aim, a single objective function containing penalty terms is introduced. The seismic performance of the case study RC frame was assessed by means of nonlinear pushover analyses, and the capacity of the plastic hinge rotation for FRP-confined columns was evaluated at the life safety performance level. The proposed framework was then applied to a non-ductile low-rise RC frame structure. The optimal retrofit scheme for the frame was determined, and the capacity curve, inter-story drift ratios, and fragility functions were computed and compared with alternative retrofit schemes. The proposed algorithm offers a unique technique for the design of more resilient structures.

Keywords: seismic retrofit; fiber-reinforced polymer; confinement; optimization; genetic algorithm; particle swarm optimization; resilient design (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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