Nonlinear finite element modelling of a simply supported beam at ambient temperature and under fire
Chaulagain, Amrit (2020)
Chaulagain, Amrit
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-202002172522
https://urn.fi/URN:NBN:fi:amk-202002172522
Tiivistelmä
The primary purpose of this Bachelor`s thesis was to develop a finite element model of simply supported IPE beam with nonlinear behaviour material definition, which can numerically simulate the structural response of IPE beam and replicate the simulation results with the physical lab test under mid-span loading by using FEA techniques in LS-DYNA. Mesh sensitivity analysis, structure only the analysis of IPE in a fire, implicit and explicit static analysis was also performed in LS-DYNA. Seven finite element models of simply supported IPE beam were created, and simulation was run in LS-DYNA.
The thesis presents the finite element modelling of a simply supported beam to examine the deformations, mesh sensitivity analysis, load versus displacement curve with explicit and implicit code, deformation in the fire of the steel IPE beam under mid-span loading. In addition, a detailed description of the numerical simulations and the theoretical background are presented in this thesis. The theoretical part of the thesis includes the general description of the finite element method; numerical method; input possible in LS-DYNA; the manual calculation of time-step; the detailed temperature calculation of unprotected steel IPE beam in a fire; LS-DYNA, and its history.
Findings revealed that LS-DYNA was able to replicate the simulation results with the physical lab test under mid-span loading, although there was a huge difference in load versus displacement curve between the LS-DYNA simulation and experimental results. Lateral torsional buckling failure was noticed on the structure with and without fire in both cases, during numerical simulation in LS-DYNA. The maximum effect of loading was observed in the mid-span of a beam by the local deformation in the upper flange of the structure.
The thesis presents the finite element modelling of a simply supported beam to examine the deformations, mesh sensitivity analysis, load versus displacement curve with explicit and implicit code, deformation in the fire of the steel IPE beam under mid-span loading. In addition, a detailed description of the numerical simulations and the theoretical background are presented in this thesis. The theoretical part of the thesis includes the general description of the finite element method; numerical method; input possible in LS-DYNA; the manual calculation of time-step; the detailed temperature calculation of unprotected steel IPE beam in a fire; LS-DYNA, and its history.
Findings revealed that LS-DYNA was able to replicate the simulation results with the physical lab test under mid-span loading, although there was a huge difference in load versus displacement curve between the LS-DYNA simulation and experimental results. Lateral torsional buckling failure was noticed on the structure with and without fire in both cases, during numerical simulation in LS-DYNA. The maximum effect of loading was observed in the mid-span of a beam by the local deformation in the upper flange of the structure.