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Experimental Study of Low Cycle Fatigue in Welded Reinforcing Steel Bars ASTM A706

Abstract:

ASTM A706 steel, used as concrete reinforcement in civil works, is often joined by overlapping or welding, this research addresses the welding joint, using the methodology proposed by AWS D1.4, static tests with an application of monotonic loads and low-cycle fatigue tests to evaluate the behavior of steel under extreme stress such as in a beam-column connection. The behavior of reinforcing steel bars of 14, 16, and 18 mm in diameter with and without welding was studied to compare the results. It is concluded that the smaller diameter bars present greater difficulty to be welded, reflecting an inadequate behavior when carrying out the destructive mechanical tests. Welded reinforcing steel bars with a larger diameter show good behavior in destructive mechanical tests, both static and cyclic, however, their use is not recommended in places of high demand since welding is directly related to compliance with the parameters of the AWS, welder, consumables, among other parameters that can affect the mechanical performance of the joint.