Experimental Studies of Reinforced Concrete Bridge Columns under Axial Load Plus Biaxial Bending
Publication: Journal of Structural Engineering
Volume 136, Issue 1
Abstract
The pseudodynamic testing of two reinforced concrete bridge columns with a reduced scale of 2/5 was performed to obtain their seismic responses to near-fault ground motions. An identical column was also cyclically tested under constant axial load plus biaxial bending to obtain the basic properties of these bridge columns. Biaxial hysteretic loops from both tests show significant stiffness and strength degradations and pinching effect. This attested to the difficulty in developing a mathematical model to realistically capture the load-displacement relation for a reinforced concrete column. The distinct characteristics of round corners and negative stiffness were found in biaxial hysteretic loops obtained from pseudodynamic tests. The scatter plots of pseudodynamic test results also show that the orientations of the resultant flexural moments do not bias in any direction. Thus, this aspect might be considered in the seismic design of a column. Since pseudodynamic results are believed to be more accurate than numerical solutions they can be treated as reference solutions in developing a finite element model. Meanwhile, the hysteretic response obtained from cyclic loading test may be used to match a mathematical model to mimic the very complicated load-displacement relation for analysis. The biaxial hysteretic loops show during unloading more stiffness degradation and pinching than the uniaxial hysteretic loops for both cyclic loading and pseudodynamic tests. This behavior indicates that damage caused in one direction weakens the seismic resistance in the other direction.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This study was supported by the National Science Council, Taipei 106, Taiwan, Republic of China, under Grant No. UNSPECIFIEDNSC-95-2211-E-027-098. All experimental works were conducted at the National Center for Research on Earthquake Engineering (NCREE).
References
AASHTO. (2002). Standard specifications for highway bridges, 17th Ed., American Association of State Highway and Transportation Officials, Washington, D.C.
Ahmad, S. H., and Weerakoon, S. L. (1995). “Model for behavior of slender reinforced concrete columns under biaxial bending.” ACI Struct. J., 92(2), 188–198.
American Concrete Institute. (1997). Design handbook, ACI SP-17, Detroit, Mich.
Aschheim, M., and Moehle, J. P. (1992). “Shear strength and deformability of reinforced concrete bridge columns subjected to inelastic cyclic displacement.” Rep. No. UCB/EERC-92/04, Earthquake Engineering Research Center, Univ. of California at Berkeley, Calif.
Bousias, S. N., Verzeletti, G., Fardis, M. N., and Gutierrez, E. (1995). “Load-path effects in column biaxial bending with axial force.” J. Eng. Mech., 121(5), 596–605.
Bresler, B. (1960). “Design criteria for reinforced columns under axial load and biaxial bending.” ACI J., 32(5), 481–490.
Chang, S. Y. (2001). “Application of the momentum equations of motion to pseudodynamic testing.” Philos. Trans. R. Soc., London, Ser. A, 359(1786), 1801–1827.
Chang, S. Y. (2002). “Explicit pseudodynamic algorithm with unconditional stability.” J. Eng. Mech., 128(9), 935–947.
Chang, S. Y., Li, Y. F., and Loh, C. H. (2004). “Experimental study of seismic behaviors of a built and repaired reinforced concrete bridge columns.” J. Bridge Eng., 9(4), 391–402.
Hong, H. P. (2001). “Strength of slender reinforced concrete columns under biaxial bending.” J. Struct. Eng., 127(7), 758–762.
Hoshikuma, J., Kwashima, K., Nagaya, K., and Taylor, A. W. (1997). “Stress-strain model for confined reinforced concrete in bridge piers.” J. Struct. Eng., 123(5), 624–633.
Hsu, C. T. (1988). “Analysis and design of square and rectangular columns by equation of failure surface.” ACI Struct. J., 85(2), 167–179.
Newmark, N. M. (1959). “A method of computation for structural dynamics.” J. Engrg. Mech. Div., 85, 67–94.
Pannell, F. N. (1963). “Failure surfaces for members in compression and biaxial bending.” ACI J., 60(1), 129–140.
Parme, A. L., Nieves, J. M., and Gouwens, A. (1966). “Capacity of reinforced rectangular columns subjected to biaxial bending.” ACI J., 63(9), 911–923.
Priestley, M. J. N., Seible, F., and Calvi, G. M. (1996). “Section 1: Seismic design philosophy for bridges.” Seismic design and retrofitting of bridges, Wiley, New York.
Qiu, F., Li, W., Pan, P., and Qian, J. (2002). “Experimental tests on reinforced concrete columns under biaxial quasi-static loading.” Eng. Struct., 24(4), 419–428.
Reinhorn, A. M., Simeonov, V., Mylonakis, G., and Reichman, Y. (1998). “IDARC-bridge: A computational platform for seismic damage assessment of bridge structures.” Rep. No. MCEER-98-0011, Multidisciplinary Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, New York.
Rodriguez, J. A., and Aristozabal-Ochoa, J. D. (1999). “Biaxial interaction diagrams for short columns of any cross section.” J. Struct. Eng., 125(6), 672–683.
Taiwan bridge design code. (1995). “Earthquake resistant design specifications for highway bridges.” Ministry of Communication and Transportation, Taiwan, R.O.C.
Wang, G. G., and Hsu, C. T. (1992). “Complete biaxial load-deformation behavior of RC columns.” J. Struct. Eng., 118(9), 2590–2609.
Yen, J. Y. R. (1991). “Quasi-Newton method for reinforced-concrete column analysis and design.” J. Struct. Eng., 117(3), 657–666.
Information & Authors
Information
Published In
Copyright
© 2010 ASCE.
History
Received: Sep 27, 2005
Accepted: Sep 1, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
Notes
Note. Associate Editor: Sashi K. Kunnath
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.