Initial Torsional Stiffness of Reinforced Concrete L-Beams under Combined Loads.(Dept.C)

2021 ◽  
Vol 8 (1) ◽  
pp. 16-31
Author(s):  
H. Shaheen ◽  
H. Hosny ◽  
A. Bayoumy
Keyword(s):  
Reinforced Concrete ◽  
Torsional Stiffness ◽  
Combined Loads

Torsional stiffness of reinforced concrete rectangular members

1979 ◽  
Vol 31 (109) ◽  
pp. 193-201
Author(s):  
D. Stephen Sandegren ◽  
C. W. Yu
Keyword(s):  
Reinforced Concrete ◽  
Torsional Stiffness

Calcul de la rigidité de torsion des poutres en béton armé fissurées en flexion

1996 ◽  
Vol 23 (6) ◽  
pp. 1190-1198 ◽  
Author(s):  
Naceur Eddine Hannachi ◽  
Bernard Fouré
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Torsional Stiffness ◽  
Longitudinal Reinforcement ◽  
Shape Stability ◽  
Simultaneous Influence ◽  
Small Torque ◽  
Good Agreement

This paper proposes a method to calculate the torsional stiffness of reinforced concrete beams with section of any shape, in a cracked state due to bending, subjected to small torque (shape stability problems). The simultaneous influence of the various parameters (shape of the section, state of cracking, longitudinal reinforcement) is taken into account. A series of laboratory tests on beams with hollow, massive, or double-tee thin cross sections gives data to determine semi-empirically some parameters. Calculated and experimental stiffnesses are in rather good agreement. The proposed method fills in a gap in the nonlinear calculation of reinforced concrete. Key words: reinforced concrete, flexural cracking, torsional stiffness, calculation method, nonlinear elasticity, stability.

Experimental and numerical studies of T-shaped reinforced concrete members subjected to combined compression-bending-shear-torsion

2021 ◽  
pp. 136943322110125
Author(s):  
Zhigang Yu ◽  
Deshan Shan
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Angular Displacement ◽  
Pressure Ratio ◽  
Numerical Analyses ◽  
Test Results ◽  
Axial Pressure ◽  
Concrete Members ◽  
Combined Loads ◽  
Torsional Behavior

The study of reinforced concrete members subjected to combined loads always has been an important research topic in the field of engineering, but the torsional behavior of T-shaped reinforced concrete members subjected to combined loads has yet to be determined. This paper is focused on providing a detailed explanation of the torsional behavior of T-shaped reinforced concrete members subjected to combined compression-bending-shear-torsion. From the perspective of experimental tests and numerical analyses, in this paper, we discuss the effects of combined loads on the torsion bearing capacity, the development of cracks and the failure mode, strains of key points in the concrete and longitudinal reinforcement, and the relation of torsion and angular displacement. We conducted experiments and numerical analyses of four groups of reinforced concrete members by using the main variables of the axial pressure ratio and the bending moment. Also, the experimental and calculated results are compared based on the elastic-plastic damage constitutive model of concrete. Based on the test data and the existing formula, we also extended the formula used to calculate the torsion bearing capacity and provided diagrams of the interaction when combined loads were applied. In addition, the results of this study highlight the turning point from torsion failure to compression-bending-torsion failure. The test results demonstrated that torsion capability increases in the specified range of axial pressure ratio and decreases as bending increases. The test results also indicate the importance of considering the effects of compression-shear-bending on the torsion bearing capacity in the engineering design.

scholarly journals EXPERIMENTAL AND ANALYTICAL COMPARISON OF TORSION, BENDING MOMENT AND SHEAR FORCES IN REINFORCED CONCRETE BEAMS USING BS 8110, EURO CODE 2 AND ACI 318 PROVISIONS

2017 ◽  
Vol 36 (3) ◽  
pp. 705-711
Author(s):  
CP Amulu ◽  
CA Ezeagu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Testing Machine ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
Bending Moments ◽  
Shear Forces ◽  
Combined Loads ◽  
Angle Crack ◽  
Set Up

This study investigated the effect of combined actions of torsional moments, bending moments and shear forces in reinforced concrete beams with concrete compressive strength of 30N/mm2.The ultimate torsional moments, bending moments, and shear forces of the beams were determined experimentally, through a simple test arrangement set-up on fifteen beam specimens grouped from BC1 to BC5, three beam specimens in each group. The combined loads were induced by loading the test beams at an eccentricity of  from the beam’s principal axis at the mid-span, using Computerized Universal Testing Machine TUE-C-100. BS 8110, Euro code 2 and ACI 318 were used to calculate the ultimate torsional moments provided by both longitudinal and transverse reinforcements, bending moments and shear forces induced. The values obtained from the codes were compared with those of experimental results for validation. It was observed that Eurocode 2 predicted the highest bending moment of 21.1530kNm, the highest torsional moments of 9.8470kNm and 12.6193kNm, for torsional resistance provided by longitudinal and transverse reinforcements respectively, at an angle crack of 45°, while BS 8110 predicted the least values. ACI 318 predicted the highest value of internal shear forces that the beams possessed before yielding to the applied loads. http://dx.doi.org/10.4314/njt.v36i3.7

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