DOI QR코드

DOI QR Code

Effect of loading rate on softening behavior of low-rise structural walls

  • Mo, Y.L. (Department of Civil Engineering, National Cheng Kung University) ;
  • Rothert, H. (Institute for Structural Analysis, University of Hannover)
  • 발행 : 1997.11.25

초록

Cracked reinforced concrete in compression has been observed to exhibit lower strength and stiffness than uniaxially compressed concrete. The so-called compression softening effect responsible is thought to be related to the degree of transverse cracking and straining present. It significantly affects the strength, ductility and load-deformation response of a concrete element. A number of experimental investigations have been undertaken to determine the degree of softening that occurs, and the factors that affect it. At the same time, a number of diverse analytical models have been proposed by various this behavior. In this paper, the softened truss model thoery for low-rise structural shearwalls is employed using the principle of the stress and strain transformations. Using this theory the softening parameters for the concrete struts proposed by Hsu and Belarbi as well as by Vecchio and Collins are examined by 51 test shearwalls available in literature. It is found that the experimental shear strengths and ductilities of the walls under static loads are, in average, very close to the theoretical values; however, the experiment shear strengths and ductilities of the walls under dynamic loads with a low (0.2 Hz) frequency are generally less than the theoretical values.

키워드

참고문헌

  1. Barda, F. (1972), "Shear strength of low-rise walls with boundary elements", Ph.D thesis, Lehigh University, Bethlehem, 265.
  2. Barda, F., Hanson, J.M. and Corley, W.G. (1976), "Shear strength of low-rise walls with boundary elements", Portland Cement Association publication RD043D, 20.
  3. Belarbi, A. and Hsu, T.T.C. (1991), "Constitutive laws of reinforced concrete in biaxial tension-compression", Research Report UHCEE 91-2, Department of Civil Engineering, University of Houston, Houston, Texas, U.S.A..
  4. Benjamin, J.R. and Williams, H.A. (1957), "The behavior of one-story reinforced concrete shear walls", Journal of the Structural Division, ASCE, 83(ST3), May, 1254.
  5. Collins, M.P. and Porasz, A. (1989), "Shear strength for high strength concrete", Bull. No. 193-Design Aspects of high strength concrete, Comite Euro-International du Beton (CEB), 1989, 75-83.
  6. Galletly, G.D. (1952), "Behavior of reinforced concrete shear walls under static load", MIT Department of Civil and Sanitary Engineering, Cambridge, Mass., August.
  7. Hsu, T.T.C. (1993), Unified Theory of Reinforced Concrete, CRC Press, Boca Ration, Florida. 313 pp.
  8. Hsu, T.T.C. and Mo, Y.L. (1985), "Softening of concrete in low-rise shear walls", Journal of the American Concrete Institute, 82(6), November-December, 883-889.
  9. Mo, Y.L. (1988), "Analysis and disign of low-rise structural walls under dynamically applied shear forces", ACI Structural Journal, 85(2), March-April, 180-189.
  10. Mo, Y.L. (1994), Dynamic Behavior of Concrete Structures, Elsevier Science Publishers B.V., Amsterdam, Netherlands, June, 424.
  11. Mo, Y.L. (1996), "Effect of boundary elements on low-rise structural walls", (in Chinese), National Science Council Project Report, No. NSC 85-2621-P006-028, July, Taiwan.
  12. Mo, Y.L. and Chan, J. (1996), "Behavior of reinforced concrete framed shear walls", Nuclear Engineering and Design, 166, 55-68. https://doi.org/10.1016/0029-5493(96)01244-7
  13. Mo, Y.L. and Rothert, H. (1995), "Effect of softening models on behavior of reinforced concrete framed shearwalls", Research Report, Institute fur Statik, Universitat Hannover, Hannover, Germany, October.
  14. Mo, Y.L. and Yang, R.Y. (1996), "Dynamic response of box tubes to combined shear and torsion", Journal of Structural Engineering, ASCE, 122(1), January, 47-54. https://doi.org/10.1061/(ASCE)0733-9445(1996)122:1(47)
  15. Pang, X.B. and Hsu, T.T.C. (1992), "Constitutive laws of reinforced concrete in shear", Research Report UHCEE92-1, Department of Civil and Environmental Engineering, University of Houston, Houston, Texas.
  16. Peter, J. (1964), "Zur bewehrug von dcheiben und schalen fur Hauptspannungen schiefwinklig zur bewehrungsrichtung", Dissertation, Lehrstuhl fur Massivbau, Technische Hochschule Stuttgart, Germany.
  17. Thorenfeldt, E., Tomaszewicz, A. and Jensen, J.J. (1987), "Mechanical properties of high-strength concrete and application in design", Proc. Symposium Utilization of High-Strength Concrete, Stavanger, Norway, Tapir Trondheim.
  18. Vecchio, F.J. and Collins, M.P. (1981), "Stress-strain characteristics of reinforced concrete in pure shear", IABSE Colloquim on Advanced Mechanics of Reinforced Concrete, Delft, Final Report, 211-225.
  19. Vecchio, F.J. and Collins, M.P. (1993), "Compression response of cracked reinforced concrete", Journal of Structural Engineering, ASCE, 119(12), 3590-3610. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:12(3590)
  20. Vecchio, F.J., Collins, M.P. and Aspiotis, J. (1994), "High-strength concrete elements subjected to shear", ACI Structural Journal, 91(4), July-August, 423-433.