INCREASE IN LATERAL–TORSIONAL BUCKLING RESISTANCE OF BEAMS BY APPLICATION OF STIFFENERS

INCREASE IN LATERAL–TORSIONAL BUCKLING RESISTANCE OF BEAMS BY APPLICATION OF STIFFENERS

Paper in proceedings (conference paper)

The paper focuses on possible types of strengthening of steel beams. Various kinds and numbers of stiffeners, haunches, doublers etc. may be applied to current steel beams. The effectivity varies greatly and must be evaluated in the design. Lateral-torsional buckling is often a very important factor determining the beam resistance. The critical buckling load of plain beams with clearly defined boundary conditions are thoroughly investigated and their design is codified. However, the finite element method finds its use for complicated geometry and semi-rigid supports. Newly developed software using CBFEM (Component Based Finite Element Method) dedicated to a design of steel members including their joints is introduced. Boundary conditions are modelled and there is no need to estimate. Two types of analyzing beam stability are presented: General method, using a combination of materially non-linear analysis and linear buckling analysis, and geometrically and materially non-linear analysis with imperfections. Both analyses show that inclined stiffeners are more effective than vertical transverse stiffeners. The most effective is the first pair of stiffeners and their effectivity decreases with their added numbers. Other dependencies of longitudinal and transverse stiffeners are also quantified in the paper.

The paper focuses on possible types of strengthening of steel beams. Various kinds and numbers of stiffeners, haunches, doublers etc. may be applied to current steel beams. The effectivity varies greatly and must be evaluated in the design. Lateral-torsional buckling is often a very important factor determining the beam resistance. The critical buckling load of plain beams with clearly defined boundary conditions are thoroughly investigated and their design is codified. However, the finite element method finds its use for complicated geometry and semi-rigid supports. Newly developed software using CBFEM (Component Based Finite Element Method) dedicated to a design of steel members including their joints is introduced. Boundary conditions are modelled and there is no need to estimate. Two types of analyzing beam stability are presented: General method, using a combination of materially non-linear analysis and linear buckling analysis, and geometrically and materially non-linear analysis with imperfections. Both analyses show that inclined stiffeners are more effective than vertical transverse stiffeners. The most effective is the first pair of stiffeners and their effectivity decreases with their added numbers. Other dependencies of longitudinal and transverse stiffeners are also quantified in the paper.

Steel beam; Lateral-torsional buckling; Stiffeners; Component Based Finite Element Method.

Steel beam; Lateral-torsional buckling; Stiffeners; Component Based Finite Element Method.

VILD, M.; ŠABATKA, L.; KABELÁČ, J.; KOLAJA, D.; HRON, L.; BAJER, M.; WALD, F.

2020

16.10.2019

University of Coimbra, INESC‐C, Portugal

Coimbra

9789892098388

3rd International Conference on Recent Advances in Nonlinear Design Resilience and Rehabilitation of Structures

187

195

9

https://www.dec.uc.pt/corass2019/downloads/CoRASS2019_proceedings.pdf