Structural Behavior of Reinforced Concrete Horizontally Curved Box Beam with Opening

Document Type : Original Article

Authors

Collage of Materials Engineering, University of Babylon, Hillah, Iraq

Abstract

This work is dedicated to survey the structural reinforced concrete's behavior horizontally curved box beams with and without opening. Seven horizontally circular box beams were examined in the experimental work, one without opening, three with vertical opening and three with transverse opening. The test program includes the main variables; direction of opening, location of opening through profile of curved beams (effect of combination of internal forces). The beams were tested as a continuous beam with two spans, each span represents a quarter circle and under the action of two point loads each load located at top face of midspan of beam. The findings indicate that the ultimate load capacity was decreased for all specimens (CB2.V37, CB3.V60, CB4.V82, CB5.T37, CB6.T60 and CB7.T82) by about (5, 11.5, 1.5,1.5, 46.4 and 18.66%) respectively, compared to the control CB1. When compared with the control specimen CB1, all specimens were indicating an increase in Service deformations in terms of deflection and twisting angle at midspan of the circular beams. The ductility was deteriorated for all specimens with opening (CB2.V37, CB3.V60, CB4.V82, CB5.T37, CB6.T60 and CB7.T82), as a percent was about (13.88, 15.3, 19.62, 0.5, 0.5 and 13.88%) respectively, compared with that of control specimen CB1. As a result, generally, a clear degradation with different percentages in overall structural behavior of box beams horizontally curved containing opening according to the location and direction of openings, in this study the transverse openings at 60°, where the opening under the combined maximum (shear and torsion) was led to a catastrophic decrease in the structural performance of horizontally curved box beam.

Keywords

Main Subjects

References

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International Journal of Engineering
Volume 35, Issue 4
TRANSACTIONS A: Basics
April 2022
Pages 774-783

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