Advances in Structural Engineering Research

Full Session with Abstracts

337103-13 - Numerical Study on The Influence of Bond-Slip Behavior on The Seismic Response of RC Columns

Friday, April 20
1:30 PM - 3:00 PM
Location: 202CD

How does this presentation impact and improve the Structural Engineering Profession?
This talk introduces and discusses analytical and design concepts related to bond of reinforcement that can contribute to the transition towards performance-based earthquake engineering, which ultimately will help our profession to achieve more resilient and cost-effective designs.

Abstract:
The bond-slip behavior of reinforcing bars has a significant influence on the inelastic behavior of reinforced concrete (RC) members. In nonlinear structural analysis, modeling bond-slip effects is desirable to accurately predict the lateral deformation capacity of RC structures, which is an essential goal of performance-based seismic design methods.
This talk presents a numerical investigation to assess the effects of bond-slip properties on the performance of RC columns subjected cyclic lateral loading. Three-dimensional nonlinear finite element (FE) models of column tests have been developed for this study. A constitutive model proposed by Moharrami and Koutromanos (2016) has been used to capture the triaxial behavior of concrete. Steel reinforcement has been modeled with a Menegotto-Pinto model (Filippou et al. 1983) modified to account for low-cycle fatigue. The bond-slip behavior of longitudinal reinforcing bars has been modeled using a concrete-steel interface element developed by Murcia-Delso and Shing (2015). The interface element has a bond stress-slip constitutive law that predicts bond deterioration caused by bar slip, cyclic loading and tensile yielding of bars. The results of the FE analyses comprising the bond-slip model have been compared to the column test results and to results of analyses considering perfect bond in terms of force-displacement hysteresis, strain distributions along the longitudinal reinforcement, and energy dissipation and deformation capacities of the columns. Finally, strategies to reduce strain concentrations in longitudinal bars and improve the ductility of RC columns by partially debonding these bars have been studied using FE analysis.

Who is the target audience?
This presentation is intended for researchers and professionals interested in nonlinear analysis and performance-based seismic design of RC structures. The purpose of the talk is to inform about (1) the need for bond-slip modeling in nonlinear analysis, and (2) the potential of bond control strategies in improving the seismic performance of RC members.

Juan Murcia-Delso

Assistant Professor
University of Texas at Austin

Juan Murcia-Delso is an Assistant Professor at the University of Texas at Austin. He received a BS/MS in civil engineering from the Technical University of Catalonia; a MS in structural analysis of monuments and historical constructions, a joint degree from the University of Minho and the Technical University of Catalonia; and a Ph.D. in structural engineering from the University of California, San Diego. His research interests focus on the behavior of reinforced concrete structures and the development of innovative analysis, design and retrofit methods for enhancing the performance of structures under extreme loading and aging effects.

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