Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
MECHANICAL EVALUATION OF THE WELDED UNION OF A TIE-RODS FOR USE IN SLOPE CONTAINMENT
Submission Author:
Antônio Carlos Barbosa Zancanella , ES
Co-Authors:
Antônio Carlos Barbosa Zancanella, Daniel Zancanella de Camargo, Luiz Rafael Resende da Silva, Bruno Corveto Bragança
Presenter: Daniel Zancanella de Camargo
doi://10.26678/ABCM.COBEM2017.COB17-0555
Abstract
The anchored wall is a slope containment method in which metal tie-rods are introduced into the ground in drilled holes through a reinforced concrete wall. These tie-rods in most cases require a joint, since they need to reach great depths, which is usually made by bolts. In this work a mechanical evaluation of the joint of tie-rods made by welding, instead of bolts, used in the application of slope containment with anchored wall, will be evaluated using the maximum tensions supported by these joints and thus their viability. Tensile, bending and penetrating liquid tests were performed on samples of CA-50 rebar, specified by GERDAU©, which allowed a quantitative and qualitative analysis of joints welded by shielded metal arc welding process (SMAW) and gas metal arc welding (GMAW) by metal inert gas (MIG) process.. These rebar are able to withstand high tensile loads due to the medium carbon concentration and the high alloy contents, ideal for use in slopes containment, which are used by VIABRAS company to contain a dam in Santa Teresa-ES. Based on the tests, it was observed that the SMAW and MIG welds in the tie-rods support, on average, a load of 15.7 and 16.28 tons, respectively. The results have indicated that the addition of heat by the welding process generates a thermally affected zone that contributes to increase the resistance of the tie-rods, generating underestimation of the calculated loads. The basic parameters were the first points of indication of the welded joints of the specimens, points obtained by the tensile test. The load required in design by VIABRAS company for the use of these tie-rods was 14 tons strength (overestimated load) the traction. The feasibility of the use of welded joints for the works of this type of application, according to the requirement of the mechanical property analyzed, allowing the use of the same to instead of bolted joints which can lead to project savings.
Keywords
rebar, anchored wall, SMAW, MIG, Tensile Test
