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http://dx.doi.org/10.12989/acc.2020.9.3.289

Experimental study on long-term behavior of RC columns subjected to sustained eccentric load  

Kim, Chang-Soo (School of Architecture, Seoul National University of Science and Technology)
Gong, Yu (School of Civil Engineering, Shandong Jianzhu University, Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures)
Zhang, Xin (School of Civil Engineering, Shandong Jianzhu University, Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures)
Hwang, Hyeon-Jong (School of Architecture, Konkuk University)
Publication Information
Advances in concrete construction / v.9, no.3, 2020 , pp. 289-299 More about this Journal
Abstract
To investigate the long-term behavior of eccentrically loaded RC columns, which are more realistic in practice than concentrically loaded RC columns, long-term eccentric loading tests were conducted for 10 RC columns. Test parameters included concrete compressive strength, reinforcement ratio, bar yield strength, eccentricity ratio, slenderness ratio, and loading pattern. Test results showed that the strain and curvature of the columns increased with time, and concrete forces were gradually transferred to longitudinal bars due to the creep and shrinkage of concrete. The long-term behavior of the columns varied with the test parameters, and long-term effects were more pronounced in the case of using the lower strength concrete, lower strength steel, lower bar ratio, fewer loading-step, higher eccentricity ratio, and higher slenderness ratio. However, in all the columns, no longitudinal bars were yielded under service loads at the final measuring day. Meanwhile, the numerical analysis modeling using the ultimate creep coefficient and ultimate shrinkage strain measured from cylinder tests gave quite good predictions for the behavior of the columns.
Keywords
reinforced concrete column; long-term behavior; eccentric loading test; creep and shrinkage; minimum reinforcement;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Gilbert, R.I. (1988), Time Effects in Concrete Structures, Elsevier Science Publishing Company Inc., New York, USA.
2 Kim, H.S. and Shin, S.H. (2014), "Reduction of differential column shortening by placing additional reinforcement", Mag. Concrete Res., 66(9), 456-464. http://dx.doi.org/10.1680/macr.13.00319.   DOI
3 Kordina, K. (1972), Langzeitversuche an Stahlbetonstutzen. Institut fur Baustoffkunde und Stahlbetonbau, Braunschweig, German.
4 Lou, T., Lopes, S.M.R. and Lopes, A.V. (2015), "FE analysis of short- and long-term behavior of simply supported slender prestressed concrete columns under eccentric end axial loads causing uniaxial bending", Eng. Struct., 85, 52-62. https://doi.org/10.1016/j.engstruct.2014.12.023.   DOI
5 Ministry of Housing and Urban-Rural Construction of the People's Republic of China (2015), National Standard of the People's Republic of China - Code for Design of Concrete Structures (GB 50010), China Architecture & Building Press, Beijing, P.R. China.
6 New Zealand Standard (2017), Concrete Structures Standard: Part 2 - Commentary on the Design of Concrete Structures (NZS 3101-2), Standards New Zealand, Wellington, New Zealand.
7 Sun, G.J., Xue, S.D, Qu, X.S. and Zhao, Y.F (2019), "Experimental investigation of creep and shrinkage of reinforced concrete with influence of reinforcement ratio", Adv. Concrete Constr., 7(4), 211-218. https://doi.org/10.12989/acc.2019.7.4.211.   DOI
8 Green, R. and Breen, J.E. (1969), "Eccentrically loaded concrete columns under sustained load (including Part 2. Supplement)", ACI J., Proc., 66(11), 866-874.
9 Hamed, E. and Lai, C. (2016), "Geometrically and materially nonlinear creep behaviour of reinforced concrete columns", Struct., 5, 1-12. http://dx.doi.org/10.1016/j.istruc.2015.07.001.   DOI
10 Huo, X.S., Al-Omaishi, N. and Tadros, M.K. (2001), "Creep, shrinkage, and modulus of elasticity of high-performance concrete", ACI Mater. J., 98(6), 440-449.
11 Kataoka, L.T. and Bittencourt, T.N. (2014), "Numerical and experimental analysis of time-dependent load transfer in reinforced concrete columns", Ibracon Struct. Mater. J., 7(5), 747-774. http://dx.doi.org/10.1590/S1983-41952014000500003.   DOI
12 Kim J.K. (2003), "Creep tests for CFT columns I - Study on long-term behavior of CFT columns with diaphragm", Seminar on Construction Technology for CFT Structures, Architectural Institute of Korea, Seoul, Republic of Korea.
13 Kim, C.S. and Gong, Y. (2018), "Numerical investigation of creep and shrinkage effects on minimum reinforcement of concentrically and eccentrically loaded RC columns", Eng. Struct., 174, 509-525. https://doi.org/10.1016/j.engstruct.2018.07.032.   DOI
14 Kim, C.S. and Park, H.G. (2010), "Longitudinal reinforcement ratio for performance-based design of reinforced concrete columns", J. Korea Concrete Inst., 22(2), 187-197. https://doi.org/10.4334/JKCI.2010.22.2.187.   DOI
15 Kim, C.S., Park, H.G., Choi, I.R. and Chung, K.S. (2017), "Effect of sustained load on ultimate strength of high-strength composite columns using 800 MPa steel and 100 MPa concrete", J. Struct. Eng., ASCE, 143(3), 04016189-1-16. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001676.   DOI
16 ACI Committee 318 (2014), Building Code Requirements for Structural Concrete and Commentary (ACI 318), American Concrete Institute, Farmington Hills, MI, USA.
17 Tatsa, E.Z. (1989), "Load carrying of eccentrically loaded reinforced concrete panels under sustained load", ACI Struct. J., 86(2), 150-155.
18 Viest, I.M., Elstner, R.C. and Hognestad, E. (1956), "Sustained load strength of eccentrically loaded short reinforced concrete columns", J. Am. Concrete Inst., 27(7), 727-755.
19 Ziehl, P.H., Cloyd, J.E. and Kreger, M.E. (1988), "Evaluation of minimum longitudinal reinforcement requirements for reinforced concrete columns", Research Report 1473-S, Center for Transportation Research, University of Texas at Austin, TX, USA.
20 ACI Committee 209 (1997), Prediction of Creep, Shrinkage, and Temperature effects in Concrete Structures (ACI 209R-92), American Concrete Institute, Farmington Hills, MI, USA.
21 B-Jahromi, A., Rotimi, A., Tovi, S., Goodchild, C. and Rizzuto, J. (2017), "Evaluation of the influence of creep and shrinkage determinants on column shortening in mid-rise buildings", Adv. Concrete Constr., 5(2), 155-171. https://doi.org/10.12989/acc.2017.5.2.155.   DOI
22 ACI Committee 501 (1936). "Building regulations for reinforced concrete", J. Proc. Am. Concrete Inst., 32(3), 407-444.
23 Architectural Institute of Korea (2016), Korean Building Code and Commentary (KBC), Seoul, Republic of Korea.
24 ASTM (2015), Standard Test Method for Creep of Concrete in Compression (ASTM C512/C512M), American Society for Testing and Materials, West Conshohocken, PA, USA.
25 ASTM (2016), Standard Test Methods for Tension Testing of Metallic Materials (ASTM E8/E8M), American Society for Testing and Materials, West Conshohocken, PA, USA.
26 ASTM (2018), Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens (ASTM C39/C39M), American Society for Testing and Materials, West Conshohocken, PA, USA.
27 Bradford, M.A. (2005), "Shrinkage and creep response of slender reinforced concrete columns under moment gradient: theory and test results", Mag. Concrete Res., 57(4), 235-246. https://doi.org/10.1680/macr.2005.57.4.235.   DOI
28 Claeson, C. and Gylltoft, K. (2000), "Slender concrete columns subjected to sustained and short-term eccentric loading", ACI Struct. J., 97(1), 45-53.
29 Eom, T.S., Kim, C.S., Zhang, X. and Kim, J.Y. (2018), "Time‑dependent deformations of eccentrically loaded reinforced concrete columns", Int. J. Concrete Struct. Mater., 12(76), 1-12. https://doi.org/10.1186/s40069-018-0312-1.   DOI
30 European Committee for Standardization (2008), Eurocode 2: Design of Concrete Structures - Part 1-1: General Rules and Rules for Buildings (Eurocode 2), European Committee for Standardization; Brussels, Belgium.