Redistribution of forces in corrosion-damaged statically indeterminate two-span reinforced concrete beams
Abstract
Redistribution of forces in corrosion-damaged statically indeterminate two-span reinforced concrete beams
Incoming article date: 01.06.2022The calculation of statically indeterminate structures, such as a two-span reinforced concrete beam in an elastic formulation does not reflect the actual force resistance, therefore, calculations of such structures are performed taking into account the occurrence of plastic deformations and the formation of plastic hinges, and the presence of local corrosion damage to concrete and reinforcement determines other dependencies of the redistribution of forces in the bent elements. The numerical calculation of 14 models with various corrosion damages along the length of the beam is performed. The dependence of the increase in deflections on the percentage of corrosion damage at various stages of loading is presented. The dependences of the redistribution of emerging forces in the span and supporting parts of a two-span beam on the percentage (length) of corrosion damage are shown. It was found that with 1% of damage at the initial stages of loading, there is a jump of tensile forces in the armature located in the span of the beam. It is determined that the greatest redistribution of tensile forces in the supporting part of the beam, which has 50-70% corrosion damage, is 11%.
Keywords: reinforced concrete beam, redistribution of forces, plastic hinge, corrosion of reinforced concrete, numerical calculation, bearing capacity