Seismic Response Evaluation of Reinforced High Strength Concrete Columns based on the Modified Constitutive Model

Authors

1 Structural Engineering, Urmia University of Technology

2 Civil Engineering Faculty , Urmia University of Technology

3 r, Civil Engineering Faculty , Urmia University of Technology

Abstract

Current study deals with strength and seismic ductility assessment of reinforced high strength concrete (HSC) columns. We have studied the nonlinear response of HSC columns with various reinforcement and axial force ratios subjected to cyclic loading. Study consists of primary verification of mathematical nonlinear model and further calibration to ensure accuracy. An existing experimental work is assumed as verification pilot that consists of four columns. Column members differ in the strength and axial force. Concrete has 63.1 MPa mean strength and 0.3% crushing strain. The longitudinal and transverse reinforcements are according to ACI 318 regulations in experiment. We used the nonlinear fiber-element code in OpenSees environment for modeling and analysis of models. The existing proposed stress-strain curve is modified to ensure validity of assessment. Calibration procedure led to conclusion that the post-yield slope needs to be modified in HSC model as the average value of ACI 363 reference. We have developed twelve extra models to estimate the interaction of concrete strength, rebar ratio and the axial force effect on the seismic performance. Parametric study of calibrated models reveals that the seismic energy dissipation in HSC members is function of the provided longitudinal reinforcement ratio and lateral confining stirrup amount.

Keywords

Main Subjects


References

1. ACI Committee 363 State-of-the-art report on highstrength concrete (ACI 363R-84)", American Concrete Institute (1984).
2. Sugano, S., Nagashima, T., Kimura, H. and Tamura, H. Experimental studies on seismic behavior of high
strength concrete columns laterally reinforced with
high strength steel bars", Proceedings of the 9th
WCEE, Tokyo, Kyoto (1988).
3. Xiao, Y. and Martirossyan, A. Seismic performance of
high-strength concrete columns", Journal of Structural
Engineering, 124(3), pp. 241-251 (1998).
4. ASCE-ACI Task Committee 426 The shear strength
of reinforced concrete members", Journal of the Structural
Division, Proceedings of the American Society of
Civil Engineers (3rd), 99, pp. 1091-1187 (1973).
5. ACI Committee 318 Building code requirements for
structural concrete (ACI 318M-02) and commentary
(ACI 318RM-02)", Metric Version, American Concrete
Institute (2002).
6. Ashour, S.A. E ect of compressive strength and
tensile reinforcement ratio on
exural behavior of highstrength
concrete beams", Engineering Structures,
22(5), pp. 413-423 (2000).
7. Bing, L., Park, R. and Tanaka, H. Stress-strain
behavior of high-strength concrete con ned by ultrahigh-
and normal-strength transverse reinforcements",
ACI Structural Journal, 98(3), pp. 395-406 (2001).
8. Kabir, M.Z. and Shafei, E. Plasticity modeling of
FRP-con ned circular reinforced concrete columns
subjected to eccentric axial loading", Composites Part
B: Engineering, 43(8), pp. 3497-3506 (2012).
9. Woods, J.M., Kiousis, P.D., Ehsani, M.R., Saadatmanesh,
H. and Fritz, W. Bending ductility of rectangular
high strength concrete columns", Engineering
Structures, 29(8), pp. 1783-1790 (2007).
10. Ho, J.C.M., Lam, J.Y.K. and Kwan, A.K.H. E ectiveness
of adding con nement for ductility improvement
of high-strength concrete columns", Engineering
Structures, 32(3), pp. 714-725 (2010).
11. Lu, Z.H. and Zhao, Y.G. Empirical stress-strain
model for uncon ned high-strength concrete under
uniaxial compression", Journal of Materials in Civil
Engineering, 22(11), pp. 1181-1186 (2010).
12. Ozbakkaloglu, T. Behavior of square and rectangular
ultra-high-strength concrete- lled FRP tubes under
axial compression", Composites Part B: Engineering,
54(1), pp. 97-111 (2013).
13. Kottb, H.A., El-Shafey, N.F. and Torkey, A.A. Behavior
of high strength concrete columns under eccentric
loads", HBRC Journal, 11(1), pp. 22-34 (2015).
14. Xiao, Y. and Yun, H.W. Experimental studies on fullscale
high-strength concrete columns", ACI Structural
Journal, 99(2), pp. 199-207 (2002).
15. Mander, J.B., Priestley, M.J. and Park, R. Theoretical
stress-strain model for con ned concrete", ACI
Journal of Structural Engineering, 114(8), pp. 1804-
1826 (1988).
16. OpenSees, Open System for Earthquake Engineering
Simulation, Paci c Earthquake Engineering Research
Center, 2.4.6 (rev 6022), Copyright 1999-2013, The
University of California, Berkley (2013).
17. Menegotto, M. Method of analysis for cyclically
loaded RC plane frames including changes in geometry
and non-elastic behavior of elements under combined
normal force and bending", In Proc. of IABSE Symposium
on Resistance and Ultimate Deformability of
Structures Acted on by Well-De ned Repeated Loads,
pp. 15-22 (1973).
18. Scott, B.D., Park, R. and Priestley, M.J.N. Stressstrain
behavior of concrete con ned by overlapping
hoops at low and high strain rates", ACI Journal,
79(1), pp. 13-27 (1982).