Abstract
This article presents the results of experimental investigation of reinforced concrete beams without transverse reinforcement on the shear. In researching, the variable parameter was relative span to effective depth ratio, which acquired the values a/d=2, 1.5, 1. The testing program involves testing of each beams samples twice. Beams were tested by the static loading of applied force at two points. Experimental results have shown the difference between the experiments of twin beams above 5 - 9%. The obtained results indicate an increase of the bearing capacity with a decrease of relative span to the effective depth ratio. The first inclined crack disclosed in mid-height cross section, at the load 50 kN at an angle equal to 45°. With increasing loading, the width of crack increased and the crack propagation occurred to the top surface of the testing sample. On occurrence of limit width of crack wmax=0.4 mm, another crack was opened in the direction from the loading point to the edge of beam support. The limit values of the crack opening width are fixed at 71 - 84% of the load carrying capacity of the samples. The effect of increasing the shear strength, according to the serviceability, is similar to the increasing of the bearing capacity and close by the value.
Highlights
A large number of buildings and structures are made from the reinforced concrete
The bearing capacity of reinforced concrete beams on the shear strength was for BO 1.1 - VEd=95 kN, BO 1.2 – VEd=140.5 kN (a/d=1/5), for BO 1.3 – VEd=198 kN (a/d=1) [11]
The obtained results indicate an increase of the bearing capacity with a decrease of relative span to the effective depth ratio
Summary
A large number of buildings and structures are made from the reinforced concrete. Its main advantages are durability and high corrosion resistance of elements. The author highlighted four main stages of development of shear stresses when increasing the transverse force in reinforced concrete beams:. The bearing capacity of reinforced concrete beams on the shear is influenced by the following factors [2]: the shear distance to effective depth radio, the percentage of reinforcement by transverse and longitudinal rebar, concrete strength and beam height. The purpose of article [8] is to determine the effect of longitudinal compression and tensile efforts, applied with eccentricity to the shear strength of bending reinforced concrete elements. As the main parameter, determining the shear stress strain state, is the presence, spread and width of the inclined crack [8], studying the fracture toughness is a topical issue of engineering
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