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Inelastic Lateral Buckling Resistance of Stepped I-beam with Compact Section and Continuous Bracing
Luis Aristeo Asistores,Shane Alolod,박종섭 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.3
Continuous multispan beams in bridges experiences high negative moment at interior supports and the top flanges of these beams are laterally braced due to the concrete slab or steel deck above it. The negative moment can be resisted by increasing the cross sections of the beams at the supports. An earlier study on the elastic lateral torsional buckling of stepped beam with continuous lateral bracing was conducted to propose new design equations. The main focus of this study is to continue the previous research considering the inelastic buckling of stepped beams. ABAQUS, a finite element method program was used to conduct the buckling analysis of the beams. A total of five different load cases were used in the analysis. The effects of the residual stress and geometric imperfection were also considered for the inelastic buckling strength. Results showed that the inelastic buckling strength exceeds the plastic moment of the section and it is not needed to focus on the inelastic range when computing the lateral torsional buckling strength.
Alolod Shane,Santos Ralph Raymond,Asistores Luis Aristeo,Park Jong Sup 한국방재학회 2018 한국방재학회 학술발표대회논문집 Vol.2018 No.-
Lateral Torsional Buckling Strength of Stepped Beams at Midspan have already been incorporated in the structural design codes. The existing equations are based only on the elastic theory for doubly-symmetric sections and gives rough approximation. In addition, previous researches using inelastic analysis were only conducted for stepped beams at the end of supports; inelastic analysis of stepped beams at midspan has not yet been considered. The aim of the study is to investigate and develop a general formulation of the inelastic lateral-torsional buckling strength equation of doubly symmetric stepped I-beam located at midspan. A universal finite element analysis program, ABAQUS, and a regression program, MINITAB17, was used in order to derive equation for the buckling capacity of the stepped beams. The results were compared to the proposed equation by the previous research for singly stepped beams and showed better results with lesser unconservative estimates. Improvements and further study can be made which can include experimental test to verify the results.