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Title: The ultimate load behaviour of multiplanar KK-joints subjected to symmetrical and anti-symmetrical axial loading
Author: Wilmshurst, S. R.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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This thesis presents the results of a numerical study into the behaviour of CHS steel KK-joints, subjected to symmetrical and anti-symmetrical axial loading, using the Finite Element Method. The objectives were to generate Finite Element data to expand the databases of KK-joints subjected to these two modes of loading and to further understanding of the ultimate load behaviours of these joints over the extended geometrical parameter ranges. This was done in order to aid the future design of multiplanar joints. A valid and accurate Finite Element model was developed and calibrated against existing experimental data. Factors that could influence the static strength, other than the geometry, were considered during the verification of the model. These included the modelling of the weld geometry, boundary conditions, loading modes, and material properties. Parametric studies were then performed to further understand the behaviour of KK-joints under the two loading modes. In total, the results of over 70 symmetrically loaded KK-joints and 35 anti-symmetrically loaded KK-joints are reported. Databases of multiplanar joints under axial loading were compiled using these and the valid test results of other researchers. Also presented are new equations to determine the failure types of symmetrically loaded KK-joints, and equations to differentiate between chord and brace failure modes. An investigation of the database of Mouty and Rondal (1990), was undertaken using Finite Element models and the failure mode equations, to establish the causes of low joint capacities and brace member failures. Using the databases, assessments were made to determine the accuracy of existing prediction equations, which resulted in their modification. Due to the complexity of the ensuing equations, simpler, yet just as effective, empirical prediction equations are proposed for symmetrically and anti-symmetrically loaded KK-joints.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available