The following figure indicates a typical testing machine.Īs indicated in the above figure, the sample is positioned and then the force will be applied until it failed. There are different testing machines developed to carry out tensile strength testing. STRENGTH STANDARD CALCULATOR CODESampling is done as per the relevant code of practices or project specifications.Īccording to BS 4449:2005, three test pieces for each nominal diameter for every 30 tons shall be tested. STRENGTH STANDARD CALCULATOR HOW TOHow to Test Tensile Strenght of Rebarįirstly, it is required to select the samples for testing. However, it shows less strain to reach the failure. Thus, it takes less elongation (or strain) to reach the ultimate tensile stress.Īs indicated in the above figure, tensile strength increases with the increase of the reinforcement steel class. When the strength of the rebar increases, its elongation reduces. There are deviations in the tensile strength or the ultimate strength of the reinforcement bars. However, when we concentrated on the nonlinear designs, we used most out of the stress that rebar can be bared without failure.Įarthquake designs, desing structures for blast loading, accidental loads designs, etc mostly occupy the nonlinear range of the reinforcement steel. In linear design, the strength of the reinforcement is basically considered up to the yielding. The tensile strength of rebar is a very important factor that we need to know in nonlinear designs. This the peak and after that necking starts and then stress reduces as shown in the above figure. The maximum stress (ultimate stress) the reinforcement bar subjected when elongating is called the tensile strength of rebar. Initially, it’s straight and after some point (we called yielding) it becomes nonlinear. The above figure indicates the typical variation of the stress and strain cure of steel. Let’s a typical variation of the stress-strain of the reinforcement bars. The composite action is the best way for this issue. Steel weak in compression when act along. Thus, the reinforcement steel is provided for the structural element to act together with concrete. We use rebarwhere the concrete is subjecting to tensile stresses and when it does not strong enough to act along to carry the loads. The tensile strength of rebar and the compressive strength of concrete are the two main strength parameters we consider in structural designs.
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