International Network on Timber Engineering Research
This paper presents the results of 19 full-scale LTB tests on glulam beams carried out by the Institute of Structural Design at the FMPA Cottbus in spring 2023 within a research project (Kuhlmann & Töpler, 2021-2023). A numerical model was verified and validated with the test results according to the FE guidelines. The model was used to perform Monte Carlo simulations on glulam beams at risk of LTB with scattering input values, including geometrical imperfections. Due to the test results, it was necessary to additionally investigate the influence of structural imperfections (scattering material properties) and shear failure. The findings are compared with current design rules.
The objectives are to clarify the influence of scattering geometrical and structural imperfections on the LTB of glulam beams, to propose values for equivalent imperfections, to evaluate the design formulae for LTB and to assess the influence of shear from torsion.