Τhe most common support structure for on-shore wind energy converters has been the cylindrical steel tower with the lattice tower taking the lead when constructing taller structures. The components of the lattice structures have to sustain loads that go far beyond what industrial steel profiles used in lattice structures can carry. The present paper addresses the investigation of the behavior of custom made cold-formed L-shaped profiles against buckling. These profile types are selected since L-shaped profiles are very easy to mount and their buckling behavior is ameliorated with the introduction of brace lacing. The profiles investigated are of certain slenderness and with the introduction of various bracing motives the profiles are of class 3 and 4. Aiming to contribute to better understanding of the structural behavior of the L-shaped profiles, the present research work focuses on the development of reliable numerical models along with the use of analytical equations in order to predict accurately and interpret the structural response of the cross-sections against buckling. The bracing chosen based on structural and geometrical criteria is the V-shaped brace and specimens with varying brace density are analyzed and compared. From the comparison between the analytical and the numerical results valuable conclusions can be taken regarding the structural behaviour of L-shaped profiles with internal bracing and their applicability on wind turbine tower structures. The ultimate slenderness and bracing type can be selected and its application on wind structures can be tested. Based on the numerical results of the specimens the present investigation is further elaborated by the laboratory testing of selected specimens, which will result in the introduction of such cross-section in the construction of real wind turbine structures.
|Publication status||Published - 25 Sep 2019|
|Event||HSTAM 2019 International Congress on Mechanics - Thessaloniki, Greece|
Duration: 22 Sep 2019 → 25 Sep 2019
Conference number: 12
|Conference||HSTAM 2019 International Congress on Mechanics|
|Abbreviated title||HSTAM 2019|
|Period||22/09/19 → 25/09/19|