Abstract
The paper presents two theoretical models for calculating shear capacity of beams without stirrups. The analysis refers to slender concrete beams without transverse reinforcement flexurally reinforced with two types of bars: steel and composite (glass fiber reinforced polymer - GFRP). The research program included 29 single-span, simply supported T-section beams without transversal reinforcement. The three point loaded beams (with span to depth ratio a/d in the range of 2.9-3.0 referring to the slender beams). The four times lower modulus of elasticity of the GFRP reinforcement revealed a gentle, progressive shear - tension failure mode, opposite to the abrupt failure mode of the RC beams.
Highlights
The shear issue in beams or unidirectionally reinforced slabs is inseparably connected with bending and occurs in the support zones of these elements
The mechanism of shear failure in the support zone of RC elements is conditioned by many factors
According to model [2], the shear capacity is the sum of shear forces transferred by the uncracked compressive chord, across web cracks and the dowel action in the longitudinal reinforcement: V = Vc + Vai + Vd
Summary
The shear issue in beams or unidirectionally reinforced slabs is inseparably connected with bending and occurs in the support zones of these elements. The complex stress state due to the combination of shear force and bending moment is difficult to be clearly described. The mechanism of shear failure in the support zone of RC elements is conditioned by many factors. In the section where this reinforcement is crossed by the shear crack, it carries both longitudinal and perpendicular stresses. The shear force is transferred by the uncracked concrete in the compressive zone and the direct strut action for point loads close to the support. Developed shear theories aim to take into account the complexity of the shear failure mechanism in the supporting zone of bent reinforced concrete elements without transverse reinforcement. Two different shear models [1] and [2] were used for a comparative analysis of experimental test results performed on the steel and GFRP reinforced beams without stirrups
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