Abstract
This paper focus on improving the load-end shortening formulae of structural elements considering collapse modes and steel grades through experimental and numerical methods. The existing load-end shortening formulae in CSR-H is derived from the buckling theoretical formulae of plates and stiffeners. Stiffener elements deform in different collapse modes under compressive loads, while hard corner elements are assumed as elasto-plastic behaviours, which may obviously overestimate the ultimate load carrying capacity due to the local buckling of plates. Beam–column buckling, torsional buckling and web local buckling for stiffener elements and hard corner elements were designed with different sizes of test specimens in compression tests. After compassion, the minimum and appropriate modelling technology with three stiffener elements and four hard corner elements were proposed to verify the load-end shortening curves of structural elements. A new load-end shortening curve for hard corner elements was developed to calculate the ultimate strength, which could reflect the realistic progressive collapse behaviours under longitudinal compression.
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