Lateral-torsional buckling of simply supported beams under uniform bending and axial tensile force

2012 ◽  
Vol 82 (10-11) ◽  
pp. 1393-1402 ◽  
Author(s):  
George I. Ioannidis ◽  
Tassos P. Avraam
Keyword(s):  
Tensile Force ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Simply Supported ◽  
Axial Tensile

Analysis on Axial Stresses of Crossbars on Aqueduct

2012 ◽  
Vol 238 ◽  
pp. 329-332
Author(s):  
Xin Li Bai ◽  
Jiang Yan Li ◽  
Bing Ma
Keyword(s):  
Cross Section ◽  
Axial Force ◽  
Water Depth ◽  
Rectangular Cross Section ◽  
Tensile Force ◽  
Side Wall ◽  
Width Ratio ◽  
Simply Supported ◽  
Axial Forces ◽  
Axial Tensile

By use of finite element method, the axial stresses of crossbars on the top of a simply supported rectangular-sectioned aqueduct were calculated in this paper. Three factors were considered, namely height-width ratio, water depth and crossbars spacing. The results show that, most crossbars are in compression when the height-width ratio of aqueduct cross-section is small, and with the height-width ratio increasing, the axial forces of crossbars change from compression to tension; Under a certain height-width ratio, when water depth is relatively small, most crossbars are in compression, and with the increase of water depth, axial forces of crossbars change from compression to tension; big axial tensile force is harmful to the rectangular cross-section floor (mid-span), but favorable to the side wall bottom. The obtained change rules of axial force and the influence of axial force on aqueduct body stress can be referenced to aqueduct design.

Lateral torsional buckling of welded wide flange beams under constant moment

2018 ◽  
Vol 45 (9) ◽  
pp. 766-779 ◽  
Author(s):  
Imran Kabir ◽  
Anjan K. Bhowmick
Keyword(s):  
Fe Analysis ◽  
Lateral Torsional Buckling ◽  
Design Specification ◽  
Torsional Buckling ◽  
Simply Supported ◽  
Lehigh University ◽  
Current Design ◽  
Flange Beams ◽  
Constant Moment ◽  
Steel Design

The structural steel design specification in Canada, CSA S16-14, uses the same equations for the design of rolled and welded shape beams for lateral torsional buckling (LTB). A recent study has shown that the current design equations might overestimate the capacity of welded wide flange (WWF) beams. This paper evaluates the performance of the current design equations in providing LTB capacities of welded I-shape beams (WWF beams). An extensive finite element (FE) analysis is performed for simply supported WWF beams subjected to constant moment. In total, 256 FE models are analyzed and it is observed that both CSA and AISC overestimate the LTB capacity of welded I-shape beams by as much as 37%, particularly when residual stress measured at Lehigh University is used in the analysis. Also, the Eurocode is found to be conservative and the proposed equation by MacPhedran and Grondin in 2011 provides better predictions of LTB strengths of WWF shapes than the current CSA approach.

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