Parametric analysis and torsion design charts for axially restrained RC beams

다국어 초록 (Multilingual Abstract)

This article presents a theoretical parametric analysis on the ultimate torsional behaviour of axially restrained reinforced concrete (RC) beams. This analysis is performed by using a computing procedure based on a modification of the Variable Angle Truss Model. This computing procedure was previously developed to account for the influence of the longitudinal compressive stress state due to the axial restraint conditions provided by the connections of the beams to other structural members. The presented parametric study aims to check the influence of some important variable studies, namely: torsional reinforcement ratio, compressive concrete strength and axial restraint level. From the results of this parametric study, nonlinear regression analyses are performed and some design charts are proposed. Such charts allow to correct the resistance torque of RC beams (rectangular sections with small height to width ratios) to account for the favorable influence of the axial restraint.

참고문헌 (Reference)

1 Luís F.A. Bernardo, "Ultimate torsional behaviour of axially restrained RC beams" 사단법인 한국계산역학회 16 (16): 67-97, 2015

2 Hsu, T. T. C., "Torsion of structural concrete - behaviour of reinforced concrete rectangular members"

3 Hsu, T. T. C., "Torsion of Reinforced Concrete"

4 Bernardo, L. F. A., "Torsion in reinforced high-strength concrete hollow beams" University of Coimbra 2003

5 Bernardo, L.F.A., "Torsion in HSC hollow beams: strength and ductility analysis" 106 (106): 39-48, 2009

6 Leu, L.J., "Torsion design charts for reinforced concrete rectangular members" 21 : 210-218, 2000

7 Bernardo, L.F.A., "Theoretical behaviour of HSC sections under torsion" 33 (33): 3702-3714, 2011

8 Taborda, C. S. B., "The effect of axial restraint on the behaviour of RC beams under torsion" University of Beira Interior 2012

9 Andrade, A. M., "TORQUE_MTEAV: Computing tool to evaluate the ultimate behaviour of reinforced and prestressed concrete beams in torsion" 2011

10 Hsu, T.T.C., "Softening of concrete in torsional members - theory and tests" 82 (82): 290-303, 1985

11 Bernardo, L. F. A., "Softened truss model for reinforced NSC and HSC beams under torsion: a comparative study" 42 : 278-296, 2012

12 Hamid R. Valipour, "Nonlinear analysis of 3D reinforced concrete frames: effect of section torsion on the global response" 국제구조공학회 36 (36): 421-445, 2010

13 A. Cevik, "Neuro-Fuzzy modeling of torsional strength of RC beams" 국제구조공학회 9 (9): 469-486, 2012

14 "IBM SPSS Statistics 19 Core System, User´s Guide"

15 "Eurocode 2: Design of Concrete Structures - Part 1: General Rules and Rules for Buildings"

16 Abdeldjelil Belarbi, "Effect of spiral reinforcement on flexural-shear-torsional seismic behavior of reinforced concrete circular bridge columns" 국제구조공학회 33 (33): 137-158, 2009

17 Belarbi, A., "Constitutive laws of softened concrete in biaxial tension-compression" Univ. of Houston 1991

18 Belarbi, A., "Constitutive laws of concrete in tension and reinforcing bars stiffened by concrete" 91 (91): 465-474, 1994

19 Comité Euro-International du Béton, "CEB-FIP MODEL CODE 1990"

20 Bernardo, L.F.A., "Behaviour of concrete beams under torsion - NSC plain and hollow beams" 41 (41): 1143-1167, 2008

21 Zhang, L.X., "Behaviour and analysis of 100 MPa concrete membrane elements" ASCE 124 (124): 24-34, 1998

22 Venable, W. N., "An Introduction to R., Version 2.15.1"

23 Jeng, C.H., "A softened membrane model for torsion in reinforced concrete members" 31 (31): 1944-1954, 2009