Experimental and numerical investigation of S700 high strength steel CHS beam–columns after exposure to fire

This paper presents an experimental and numerical investigation into the post-fire behaviour residual capacity of S700 high strength steel circular hollow section (CHS) beam–columns. The was performed on ten CHS beam–columns included heating cooling specimens as well material testing, initial global geometric imperfection measurements pin-ended eccentric compression tests. A subsequent conducted, where finite element models were developed validated against test results then employed to carry out parametric studies generate further data over a wide range cross-section dimensions, member lengths loading combinations. In view fact that there are no specific provisions for design structures after exposure fire, relevant room temperature interaction curves evaluated, using properties, assess their applicability based data. evaluation revealed provided in American Specification Australian Standard result level accuracy consistency, while Eurocode curve leads more conservative scattered failure load predictions. Finally, revised curve, with accurate end points, proposed shown offer improved predictions fire.