Myoungsu (James) Shin, Ph.D., P.E.Associate Professor, School of Urban and Environmental Eng., Ulsan National Institute of Science and Technology (UNIST), South Korea,
Advanced Seismic Design and Modeling of Slender Coupling Beams
Myoungsu (James) Shin, Ph.D., P.E.
Associate Professor, School of Urban and Environmental Eng., Ulsan National Institute of Science and Technology (UNIST), South Korea
Research Scholar, Dept. of Civil and Environmental Eng., University of Illinois at Urbana-Champaign (UIUC), USA
Tall buildings have been city landmarks and symbols of economic breakthrough since their emergence, and the number has drastically increased during the last couple of decades due to their green benefits such as high density land use and efficient functionalities. With no doubt, this increase is benefited from the progress of structural and construction technologies.
In the seismic design of tall buildings, reinforced concrete (RC) coupled walls have been recognized for their superior stiffness and strength against lateral actions. Properly designed coupling beams can provide significant stiffness, strength, ductility, and energy dissipation capacities to the entire system. To improve the seismic design of RC coupling beams, various reinforcement methods and materials have recently been investigated.
This study aims at exploring the use of high-performance fiber reinforced cement composites (HPFRCCs) as an innovative method of upgrading the seismic performance and relieving the reinforcement congestion of slender coupling beams. Also, the effectiveness of diagonal reinforcement in slender coupling beams is evaluated in comparison to conventional reinforcement. Diagonally reinforced coupling beams designed according to current codes are expected to endure significant inelastic deformations during earthquakes. However, fabrication of the beams is very difficult due to the complex arrangement and congestion of diagonal reinforcement. To resolve this issue, the feasibility of bundling diagonal reinforcement is also investigated. In this study, about fifteen 1/2-scale coupling beams having the length-to-depth ratio of 3.5 were tested under cyclic lateral loading up to about 10% drift.
Furthermore, the reliability of ASCE/SEI 41-13 modeling parameters for the nonlinear behavior of RC coupling beams with various design details is assessed based on a database of almost all coupling beam tests available in literature.
Myoungsu Shin holds a B.S. (1994) and M.S. (1998) from Seoul National University and a Ph.D. (2004) from the University of Illinois at Urbana-Champaign. He has been on the faculty of the School of Urban and Environmental Engineering at UNIST since March 2010. Dr. Shin was previously an Assistant Professor at Morehead State University in Kentucky from 2004 to 2006. He is a licensed Professional Engineer in the U.S. with about four years of practical engineering experience at Rosenwasser Grossman Consulting Engineers in New York, NY before joining UNIST. Prof. Shin is a member of many national and international, technical and administrative committees, including ACI-ASCE Committees 352 (Joints and Connections), 421 (R/C Slabs), and ACI Committee 374 (Performance-Based Seismic Design). His primary research interests include seismic design, modeling, and assessment of civil infrastructures, design optimization of tall buildings, high performance sustainable materials (e.g. fiber-reinforced, self-healing, sulfur composites), and non-destructive evaluation technologies.
Host: Dr. Mustafa Mahamid