Structural Behavior Analysis and Design of Steel Plate Hoop Reinforced Steel Beam-RC Column Joint

Abstract

Structural repair reinforced concrete (hereinafter referred as RC) column as well as its connection to beam is a major topic in civil engineering. The beam-column joint under complex stress should be fully considered especially during its repair design. Steel plate hoop reinforcing RC column-steel beam joint is not only able to retrofit the column structural ability but also to address the beam-column connection problem easily through the steel connection measures. Based on a realistic engineering case, this paper presents the finite element analysis on steel plate hoop reinforcing RC beam-column joint subjected to complex loadings, which provides the technical suggestions for the engineers. In the finite element model, applied loads calculated from Chinese design software PKPM are suitably addressed and different working scenarios are discussed including the changed heights of reinforced rib (75mm and 150mm), the vertical support to the cantilever steel beam and different loading combinations of loads from column, surrounding beams, edge beam and the eccentric load from stairs. The results show that the joint with short reinforced rib of 75 mm shows stress concentration with the stress exceeding design strength so that local reinforcement should be considered. The joint with 150 mm reinforced rib under combined loads from edge beam and eccentric loading from stairs also shows local stress exceeding design material strength. Local reinforcement measures are proposed to improve the joint structural capability. The vertical support to the cantilever steel beam can improve the joint stress and deformation situations. During repair construction, the vertical propping should be loaded incrementally and maintained at 40 kN.