Abstract
In this paper, the behavior of slender steel delta girders (SDG) is investigated both analytically and numerically. In the analytical analysis, closed-form equations for cross-section properties of SDG are derived. They are then compared with solutions obtained numerically. Using these cross-section properties, the theoretical elastic lateral-torsional buckling (LTB) strength of these girders are determined and compared with results obtained from a finite element analysis. The results show that the theoretical LTB equation derived for general open monosymmetric I-sections can be applied to these delta girders. Additionally, it is shown that a simplified expression for the coefficient of monosymmetry βx derived for I-sections can be used in the computation of LTB strength for SDG. A parametric study is then performed to demonstrate the effectiveness of SDG in achieving a favorable strength-to-weight ratio when compared to standard I-section members. Based on the results of this parametric study, it is recommended that the height and width of the delta region of the cross-section be equal to two-fifth the height of the web and three-quarter the width of the compression flange, respectively.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 914-931 |
| Number of pages | 18 |
| Journal | International Journal of Steel Structures |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 1 2019 |
Keywords
- Design guidelines
- Finite element analysis
- Lateral-torsional buckling
- Steel delta girder
- Torsional properties
ASJC Scopus subject areas
- Civil and Structural Engineering