Title:
High-Strength Flexural Reinforcement in Reinforced Concrete Flexural Members under Monotonic Loading
Author(s):
Marnie B. Giduquio, Min-Yuan Cheng, and Leonardus S. B. Wibowo
Publication:
Structural Journal
Volume:
112
Issue:
6
Appears on pages(s):
793-803
Keywords:
deformation capacity; flexural strength; high-strength steel
DOI:
10.14359/51688057
Date:
11/1/2015
Abstract:
This paper evaluates the performance of reinforced concrete (RC) flexural members reinforced with two different types of highstrength steels—Grade 100 A1035 and SD685—under monotonic loading. Test results indicate that design concepts of the current ACI Building Code can be used to evaluate the strength of specimens reinforced with either type of high-strength flexural reinforcement. With similar design parameters, specimens reinforced with high-strength flexural reinforcement exhibit equivalent ultimate displacement to those with conventional Grade 60 steel. Specimen behavior is greatly influenced by the buckling of compression reinforcement after spalling of cover concrete in the compression zone. The maximum spacing of transverse reinforcement (Grade 60) not exceeding 8db is suggested to restrain either SD685 or A1035 highstrength longitudinal reinforcement against premature buckling in flexural members primarily subjected to gravity-type loading, where db is the diameter of smallest compression reinforcement.
Related References:
ACI Committee 318, 2014, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary,” American Concrete Institute, Farmington Hills, MI, 519 pp.
ACI Innovation Task Group 6, 2010, “Design Guide for the Use of ASTM A1035/A1035M Grade 100 (690) Steel Bars for Structural Concrete (ACI ITG-6R-10),” American Concrete Institute, Farmington Hills, MI, 2010, 90 pp.
Aoyama, H., 2001, “Design of Modern High-Rise Reinforced Concrete Structures,” Series of Innovation in Structures and Construction, V. 3, Imperial College, London, UK, 442 pp.
ASTM A1035/A1035M-11, 2011, “Standard Specification for Deformed and Plain, Low-Carbon, Chromium, Steel Bars for Concrete Reinforcement,” ASTM International, West Conshohocken, PA, 5 pp.
ASTM A370, 2012, “Standard Test Methods and Definitions for Mechanical Testing of Steel Products,” ASTM International, West Conshohocken, PA, 48 pp.
ASTM A706/A706M, 2009, “Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement,” ASTM International, West Conshohocken, PA, 6 pp.
Harries, K. A.; Shahrooz, B. M.; and Soltani, A., 2012, “Flexural Crack Widths in Concrete Girders with High-Strength Reinforcement,” Journal of Bridge Engineering, ASCE, V. 17, No. 5, Sept.-Oct., pp. 804-812. doi: 10.1061/(ASCE)BE.1943-5592.0000306
Liel, A. B.; Haselton, C. B.; and Deierlein, G. G., 2011, “Seismic Collapse Safety of Reinforced Concrete Buildings. II: Comparative Assessment of Nonductile and Ductile Moment Frames,” Journal of Structural Engineering, ASCE, V. 137, No. 4, Apr., pp. 492-502. doi: 10.1061/(ASCE)ST.1943-541X.0000275
Lin, C.-H., and Lee, F.-S., 2001, “Ductility of High-Performance Concrete Beams with High-Strength Lateral Reinforcement,” ACI Structural Journal, V. 98, No. 4, July-Aug., pp. 600-608.
Mast, R. F.; Dawood, M.; Rizkalla, S. H.; and Zia, P., 2008, “Flexural Strength Design of Concrete Beams Reinforced with High Strength Steel Bars,” ACI Structural Journal, V. 105, No. 5, Sept.-Oct., pp. 570-577.
Priestley, M. J. N.; Seible, F.; and Calvi, G. M., 1996, Seismic Design and Retrofit of Bridges, John Wiley & Sons, Inc., New York, 686 pp.
Rashid, M. A., and Mansur, M. A., 2005, “Reinforced High-Strength Concrete Beams in Flexure,” ACI Structural Journal, V. 102, No. 3, May-June, pp. 462-471.
Shahrooz, B. M.; Miller, R. A.; Harries, K. A.; and Russell, H. G., 2011, “Design of Concrete Structures Using High-Strength Steel Reinforcement,” NCHRP Report 679, Transportation Research Board, Washington DC, 72 pp.
Shahrooz, B. M.; Reis, J. M.; Wells, E. L.; Miller, R. A.; Harries, K. A.; and Russell, H. G., 2014, “Flexural Members with High-Strength Reinforcement: Behavior and Code Implications,” Journal of Bridge Engineering, ASCE, V. 19, No. 5, May, 7 pp.
Sumpter, M. S.; Rizkalla, S. H.; and Zia, P., 2009, “Behavior of High-Performance Steel as Shear Reinforcement for Concrete Beams,” ACI Structural Journal, ASCE, V. 106, No. 2, Mar.-Apr., pp. 171-177.
Wang, S.-C.; Lee, H.-J.; and Hwang, S.-J., 2009, “Mechanical Properties, Splice, and Anchorage of New High-Strength Reinforcing Bars,” Paper No. A-02, TCI 2009 Concrete Technology Conference, 10 pp. (in Chinese).