Major axis steel joint under torsion

Major axis steel joint under torsion: Stiffness and strength characterization

Gil, Beatriz (University of Navarra, Pamplona)
Goñi, Rufino (University of Navarra, Pamplona)
Bijlaard, F.S.K. (TU Delft Steel & Composite Structures)
Bayo, Eduardo (University of Navarra, Pamplona)

2019

Torsional effects in joints need to be investigated in order to get a complete model of the joint and also to assess the real boundary conditions for the lateral torsional effects in the beams of structural frames. Phenomena such as: torsion, warping, lateral buckling, etc. are usually analysed assuming simplified boundary conditions, namely pinned or rigid, in frame analysis which can lead to erroneous and non-conservative results. With the aim of knowing the correct boundary conditions and real behaviour of the joints under torsion, an experimental program is carried out consisting of two tests of mayor axis doubled extended bolted end plate joints subjected to torsion about the axis along the length of the beam. These experimental results have allowed the validation of the finite element models carried out using the program Abaqus. Once the models are validated models, a parametric study is performed to assess the stiffness and resistance. This study also verifies that these joints behave in a semi-rigid way when compared with the torsional characteristics of the attached beam. Besides, the beam fails prior to the connection in most cases, and therefore, the joints can be assumed to behave as full-strength. Analytical expressions are proposed and checked with the FEM results proving that the proposed analytical formulae and the proposed mechanical model can predict the stiffness quite accurately, with an average error of 8.5%. Despite these joints can be classified as full-strength under torsion, an assessment of their resistance is done as well.

Analytical characterization
Component method
Experimental
FEM
Steel joints
T-stub
Torsion
Warping

http://resolver.tudelft.nl/uuid:5f831bd0-f1ce-4303-ada6-cab8be9ff5bf

https://doi.org/10.1016/j.engstruct.2018.11.060

2020-12-01

0141-0296

Engineering Structures, 180, 586-602

Institutional Repository

journal article

© 2019 Beatriz Gil, Rufino Goñi, F.S.K. Bijlaard, Eduardo Bayo