Abstract
This study is carried out to evaluate the potential of three hybrid T-beams with web openings theoretical shear stresses distribution. The shear stresses at the opening edges were plotted at the working stage, yielding stage and collapse stage for these three tested beams. The available experimental results from the previous research was compared to the finite element results as well as the developed analytical. The shear stress distribution at the middle of the top and bottom chords of the opening in pure bending region are zero. At the upper and lower corners of the opening occurs the maximum shear stresses. The maximum shear stress occurs at the right lower corner chord at the high moment edge and at the left upper corner chord at the low moment edge in beams with openings at high shear and high flexural – shear region. Furthermore, an extensive parametric study is performed on these beams to find the distributing ratio of the shear force between the opening chords. The shear force at an opening in hybrid R/C T-beam is carried by the top and bottom chords of the opening according to the area – moment of inertia root ratio with the correction factor 0.70.
Highlights
Web opening in beams occur quite often in practice to provide convenient passage of environmental services to provide passage for utility duct and pipes, it translates into substantial economic savings in the construction of a multi-storey building [1]
In practical life it is quite often use to provide convenient passage of environmental services which reduce the story heights of buildings and weight of concrete beams as it improves the demand on the supporting frame both under gravity loading and seismic excitation which results in major cost saving
Openings should be positioned on the concrete beams to provide chords with sufficient concrete area for developing ultimate compression block in flexure and adequate depth for providing effective shear reinforcement [5]
Summary
Web opening in beams occur quite often in practice to provide convenient passage of environmental services to provide passage for utility duct and pipes, it translates into substantial economic savings in the construction of a multi-storey building [1]. Utilization of high strength concrete in construction sector has increased due to its improved mechanical properties compared to ordinary concrete [2] One such mechanical property, shear resistance of concrete beams is an intensive area of research. In practical life it is quite often use to provide convenient passage of environmental services which reduce the story heights of buildings and weight of concrete beams as it improves the demand on the supporting frame both under gravity loading and seismic excitation which results in major cost saving. Openings should be positioned on the concrete beams to provide chords with sufficient concrete area for developing ultimate compression block in flexure and adequate depth for providing effective shear reinforcement [5]. The openings should be provided so that chords have enough concrete area to develop the ultimate compression block in flexure and sufficient.
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