Title:
Seismic Resistance of Strengthened Reinforced Concrete Walls by Thick Jacketing
Author(s):
Tae-Sung Eom, Mu-Won Hur, and Sang-Hyun Lee
Publication:
Structural Journal
Volume:
117
Issue:
6
Appears on pages(s):
93-103
Keywords:
cyclic test; jacketing; seismic retrofit; shear connection; strengthening; structural wall
DOI:
10.14359/51725984
Date:
11/1/2020
Abstract:
This study investigated the seismic resistance of thin, lightly reinforced walls strengthened in the out-of-plane direction by thick jacketing. To connect the thin existing wall and thick strengthening jacket, a tee shear connector consisting of one T-shaped steel section and several dowel bars and anchor bolts was used. Cyclic tests of four jacketed wall specimens were performed under out-of-plane lateral loading. The tests showed that the strength of the strengthened walls by thick jacketing was significantly enhanced. During the initial behavior, the tee shear connector performed well, not only as the shear connector, but also as the flexural tension reinforcement. However, as concrete damage increased during repeated load cycles, bond failure occurred early in the tee shear connector under flexural tension. The flexural strengths of the strengthened walls by thick jacketing were computed based on full and partial composite action of the tee section, and the bond and shear resistances of the tee shear connector were estimated in accordance with the provisions of ACI 318-19.
Related References:
ACI Committee 318, 2019, “Building Code Requirements and for Structural Concrete (ACI 318-19) and Commentary,” American Concrete Institute, Farmington Hills, MI, 624 pp.
Alcocer, S. M., and Jirsa, J. O., 1993, “Strength of Reinforced Concrete Frame Connections Rehabilitated by Jacketing,” ACI Structural Journal, V. 90, No. 3, May-June, pp. 249-261.
Bett, B. J.; Klingner, R.; and Jirsa, J. O., 1988, “Lateral Load Response of Strengthened and Repaired Reinforced Concrete Columns,” ACI Structural Journal, V. 85, No. 5, Sept.-Oct., pp. 499-508.
Eom, T. S., and Park, H. G., 2010, “Evaluation of Energy Dissipation of Slender Reinforced Concrete Members and its Applications,” Engineering Structures, V. 32, No. 10, pp. 2884-2893. doi: 10.1016/j.engstruct.2010.05.007
Hwang, Y. H., Yang, K. H., Shim, J. I., and Choi, Y. S., 2018, “Evaluation of Axial Compressive Performance of Section Enlargement Strengthening Columns with Prefabricated Reinforcement Units in the Jacket Section,” Journal of the Korea Concrete Institute, V. 30, No. 6, pp. 609-616.
Julio, E. N. B. S.; Branco, F. A. B.; and Silva, V. D., 2005, “Reinforced Concrete Jacketing Interface Influence on Monotonic Loading Response,” ACI Structural Journal, V. 102, No. 2, Mar.-Apr., pp. 252-257.
Park, H. G., and Eom, T. S., 2006, “A Simplified Method for Estimating the Amount of Energy Dissipated by Flexure-Dominated Reinforced Concrete Members for Moderate Cyclic Deformations,” Earthquake Spectra, V. 22, No. 2, pp. 459-490. doi: 10.1193/1.2197547
Rodriguez, M., and Park, R., 1991, “Repair and Strengthening of Reinforced Concrete Buildings for Seismic Resistance,” Earthquake Spectra, V. 7, No. 3, pp. 439-459. doi: 10.1193/1.1585636
Rodriguez, M., and Park, R., 1994, “Seismic Load Tests on Reinforced Concrete Columns Strengthened by Jacketing,” ACI Structural Journal, V. 91, No. 2, Mar.-Apr., pp. 150-159.