Features of the work of continuous perforated beams near intermediate supports

Abstract

The stress-strain state data for various types of intermediate supports in two-span continuous perforated beams were obtained through calculations using the finite element method within the "Lira" software complex. The calculations were performed under the influence of a symmetrical evenly distributed load applied across the spans. It was determined that the design of the intermediate support has minimal influence on the magnitude of maximum deflections and stresses within the beam span. However, it somewhat changes the nature of its operation, especially in the case of using a support part without transverse stiffeners and with unwelded holes to the left and right of the axis of the support. The maximum normal stresses were observed at the characteristic design point of the cross-section with the hole in the supporting part of the beam, specifically without the stiffening rib and with unwelded holes on both sides of the support. Additionally, comparable stress values were noted with the inclusion of stiffeners, albeit still with unwelded holes. In all cases, these stresses remain below the calculated yield point resistance of the steel. The inclusion of welded holes and support stiffeners proves beneficial in enhancing the performance of the support components. This is attributed to a significant reduction in the concentration of both tangential and normal stresses, despite stress values in all scenarios remaining below the calculated resistance of steel.