Stress Field in Web of RC Thin‐Webbed Beams Failing in Shear
Publication: Journal of Structural Engineering
Volume 116, Issue 9
Abstract
The resistant mechanisms of reinforced and prestressed thin‐webbed beams failing in shear are effective on the condition that the web reinforcement and thickness are suitably designed. With regard to this, a rational model is developed for the limit analysis of a thin web at the onset of shear collapse because of stirrup yielding, also considering the aggregate interlock (along the shear cracks), the bending stiffness of the inclined concrete struts, the bond properties of the stirrups, and the ultimate capacity (in shear and compression) of the struts. The proposed model is an improved version of the well‐known Mörsch's truss, which is well suited to the modeling of a regularly cracked web subjected to prevailing shear. By solving a nonlinear system of equations regarding the equilibrium, compatibility, constitutive laws of the web, and various contributions to the web state of stress are investigated. The assumption introduced by other scholars, and adopted here also, that the web be subjected to a diagonal compression field, proves to be based on clear physical phenomena.
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References
1.
ASCE‐ACI Task Committee 426. (1973). “The shear strength of reinforced concrete members.” J. Struct. Div., ASCE, 99(6), 1091–1187.
2.
Bažant, Z. P., and Gambarova, P. G. (1980). “Rough cracks in reinforced concrete.” J. Struct. Div., ASCE, 106(4), 819–842.
3.
Ciampi, V., et al. (1982). “Analytical model for concrete anchorages of reinforcing bars under generalized excitations.” Report No. UCB/EERC‐82/23, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
4.
Collins, M. P. (1978). “Towards a rational theory for R/C members in shear.” J. Struct. Div., ASCE, 104(4), 649–666.
5.
Dei Poli, S., Gambarova, P. G., and Karakoç, C. (1987). “Aggregate interlock role in R.C. thin‐webbed beams in shear.” J. Struct. Engrg., ASCE, 113(1), 1–19.
6.
Di Prisco, M., and Gambarova, P. G. (1987). “On the ultimate shear behavior of R/C and P/C thin‐webbed beams.” Studi e Ricerche, School for Design of R/C Structs., Politecnico di Milano, Milan, Italy, 199‐268 (in Italian).
7.
Gambarova, P. G., and Karakoç, C. (1983). “A new approach to the analysis of the confinement role in regularly cracked concrete elements.” Trans., 7th SMiRT Conf., H, Paper H5/7, Chicago, Ill., Aug., 251–261.
8.
Ghosh, S. K. (1987). “Shear reinforcement requirements for precast prestressed double‐tee members.” ACI Struct. J., Tech. Paper 84‐530, Jul.‐Aug., 287–292.
9.
Giuriani, E. (1982). “On the effective axial stiffness of a bar in cracked concrete.” Bond in Concrete, P. Bartos, ed., Applied Sci. Publishers, London, U.K., 107–125.
10.
Kordina, K., Hegger, J., and Teutsch, M. (1989). “Shear strength of prestressed concrete beams with unbonded tendons.” ACI Struct. J., Tech. Paper No. 86‐S15, Mar.‐Apr., 143–149.
11.
Kupfer, H., Mang, R., and Karavesyroglou, M. (1983). “Failure of the shear zone in R/C and P/C beams—Theoretical analysis including aggregate interlock.” Bauingenieur Bulletin No. 58, 143–149 (in German).
12.
Nielsen, M. P., Braestrup, M. W., and Bach, F. (1978). “Rational analysis of shear in reinforced concrete beams.” IABSE Proc., P15/78.
13.
Regan, P., and Rezai‐Jorabi, H. (1988). “The shear resistance of reinforced concrete I‐beams.” Studi e Ricerche, School for the Design of R/C Structs., Politecnico di Milano, Milan, Italy, 305–321.
14.
Reineck, K. H. (1988). “Theoretical considerations and experimental evidence on web compression failures of high strength concrete beams.” Report, Institut für Massivbau, Stuttgart Univ., presented at CEB‐Plenary Session, 4th Session on High‐Strength Concr., Dubrovnik, Yugoslavia, Sept.
15.
Vecchio, F. J., and Collins, M. P. (1986). “The modified compression‐field theory for reinforced concrete elements subjected to shear.” ACI J., Tech. Paper No. 83‐22, Mar.‐Apr., 219–231.
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Published In
Journal of Structural Engineering
Volume 116 • Issue 9 • September 1990
Pages: 2496 - 2514
Copyright
Copyright © 1990 ASCE.
History
Published online: Sep 1, 1990
Published in print: Sep 1990
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