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Elastic Lateral Torsional Buckling Resistance of Beams Strengthened with Cover Plates Under Pre-existing Loads
The present study investigates the elastic Lateral Torsional Buckling (LTB) behavior of flexural steel members of W sections that are strengthened with steel cover plates while under loading. For this purpose, a finite element study is developed to investigate the effect of span, strengthening scenarios where only a portion of beam is strengthened, types and location of loading before and after strengthening, magnitude of pre-strengthening loads, boundary conditions, and load height. Abaqus shell model is used to carefully simulate the full sequence of pre-existing loading application, application of clamping forces to bring into contact the initially straight steel cover plates with the bent configuration of the beam, the rebound arising during the removal of the clamping forces, welding at the interfaces between the cover plates and the flanges, the application of post-strengthening loads up to the point of onset of elastic LTB for the strengthened system as determined by eigenvalue analysis. It is shown that web distortional effects play an important role in reducing the elastic critical moment capacity. Practical recommendations are then provided to suppress distortional effects and maximize the elastic critical moment capacity of the strengthened beams. The study shows that cover plate strengthening is an effective means of increasing the LTB capacity of existing beams. A simplified design equation is then proposed to quantify the post-strengthening critical moment capacity of strengthened beams. The merits and limitations of the equation are identified and discussed.
Elastic Lateral Torsional Buckling Resistance of Beams Strengthened with Cover Plates Under Pre-existing Loads
The present study investigates the elastic Lateral Torsional Buckling (LTB) behavior of flexural steel members of W sections that are strengthened with steel cover plates while under loading. For this purpose, a finite element study is developed to investigate the effect of span, strengthening scenarios where only a portion of beam is strengthened, types and location of loading before and after strengthening, magnitude of pre-strengthening loads, boundary conditions, and load height. Abaqus shell model is used to carefully simulate the full sequence of pre-existing loading application, application of clamping forces to bring into contact the initially straight steel cover plates with the bent configuration of the beam, the rebound arising during the removal of the clamping forces, welding at the interfaces between the cover plates and the flanges, the application of post-strengthening loads up to the point of onset of elastic LTB for the strengthened system as determined by eigenvalue analysis. It is shown that web distortional effects play an important role in reducing the elastic critical moment capacity. Practical recommendations are then provided to suppress distortional effects and maximize the elastic critical moment capacity of the strengthened beams. The study shows that cover plate strengthening is an effective means of increasing the LTB capacity of existing beams. A simplified design equation is then proposed to quantify the post-strengthening critical moment capacity of strengthened beams. The merits and limitations of the equation are identified and discussed.
Elastic Lateral Torsional Buckling Resistance of Beams Strengthened with Cover Plates Under Pre-existing Loads
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Iranpour, Amin (author) / Mohareb, Magdi (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 37 ; 547-564
2023-08-06
18 pages
Article/Chapter (Book)
Electronic Resource
English
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