Abstract
ABSTRACT Recent developments in technology and manufacturing of steel has led to a significant increase in the strength of this material while keeping the weight constant. This has resulted in an increase in the application of high strength steel material in structural practice and consequently a rising demand in updated design guidelines. The present research covers compression experiments and design of ultra-high strength steel hollow circular members with a nominal yield strength of 1250 MPa. The performance is compared against two other grades of steel: Mild Steel grade 300 and high strength steel grade 750. Different section geometries are modelled using finite element software and validated against the experimental compression tests. A parametric analysis is conducted on a range of section geometries and lengths and the result are compared against current design guidelines of AS4100, and AISC360. The compressive performance is studied considering both the section slenderness and the member slenderness ratios. The results show that as the member slenderness and yield strength of the sections increase, the standard predictions give a more conservative prediction of the compression capacity. Using proposed modifications for member slenderness limits and compression capacity factors, design recommendations are suggested for grade 1200 steel
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