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http://dx.doi.org/10.7781/kjoss.2015.27.1.023

Initial Imperfection and Axial Strength of Struts with Octagonal Hollow Section fabricated from HR Plate  

Jo, Jae Byung (Dept. of Civil Engineering, Kyonggi University)
Publication Information
Journal of Korean Society of Steel Construction / v.27, no.1, 2015 , pp. 23-30 More about this Journal
Abstract
Developed in this study were Octagonal-hollow-section(OHS) struts, whose compressive strengths against flexural and local buckling is higher than H-shape or rectangular-hollow-section(RHS) struts with the same unit weight. OHS members are also advantageous in handling and storing compared to circular hollow sections(CHS). OHS members were fabricated from HR Plates by cold forming and fillet welding. 5 numbers of 20m long OHS struts were assembled, each of which consist of two 9.6m long OHS member and two end connection elements made of cast iron. The compressive strength of the OHS strut was evaluated by comparing the test results, design codes and FEM analysis each other. Test results show that all of the struts have almost same or larger compressive strength than Korean Road Bridge Design Code(KRBDC) (2012). The initial imperfections can be estimated by using measured strains and are turned out to be less than L/450 for all the struts tested. The results of FEM analysis show that the variation of initial imperfection has less effects on the compressive strength for struts with vertical surcharge than for those with self-weight only, while the strength decreases as the initial imperfection increases. As the result of this study, the allowable initial imperfection for 20m long OHS struts is recommended to be less than L/350 on job sites.
Keywords
Strut; Octagonal-hollow-section(OHS); Initial imperfection; Compressive strength;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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