Calculation of Reinforced Concrete Beams of Rectangular Section under Combined Effects of Lateral Forces, Torsional and Bending Moments

ABSTRACT

The article provides justification for the calculation of reinforced concrete beams of rectangular section with the combined effect of lateral forces, torsional and bending moments. Solving the problem of ensuring the reliability and quality of construction projects in Republic of Belarus, near and far abroad authors emphasize the inevitability of calculation of reinforced concrete structures subjected to torsional bending. The necessity of experimental and theoretical investigations of the strength of reinforced concrete beams curved shape in plan, edge girders of the reinforced concrete bases of the cross tapes, beams open crane trestles and overpasses, girders in the space frame design and runs monolithically connected with the secondary support structure as the bearing capacity of such elements at torsion is relatively lower than in bending. Using the stress tensor for bending, shear force, torque and combined effects of these factors presents the overall situation of the research work of spatial sections of concrete beams of rectangular cross section includes the analysis of the stress state of the three main characteristic cases. When calculating the strength of the spatial section adopted an idealized two-line diagram of deformation according to TCP EN 1992-1-1, which is based on the method of calculating the load-bearing capacity of reinforced concrete rectangular beam that subjected simultaneouslytorque and bending moment. The bearing capacity of reinforced concrete beam under the combined action of torque moment and lateral force is dictated by the condition of the strength of the correlation moments of the external and internal forces about the axis passing through the center of gravity of the compression area of the beam with the rectangular trapezoid stress distribution in the compression area. The simplified way of calculation of spatial sections of reinforced concrete beams of rectangular cross section is offered.

Keywords: stress condition, stress tensor, cross section, torque moment, bending moment, spatial section, parts of stirrup, kern area

For citation: Semeniuk S., Zezulin A., Semeniuk E. Calculation of Reinforced Concrete Beams of Rectangular Section under Combined Effects of Lateral Forces, Torsional and Bending Moments. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 7. 2015. pp. 133-151.

Full text in Russian:

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