Design resistance of helical seam pipe columns with limited tensile test data

This study conducts a capacity factor calibration for steel and steel-concrete composite columns with helical seam pipe (also known as spiral welded tube) sections considering the following three member types: (i) under axial compression, (ii) concrete-filled tubes (CFSTs) (iii) CFSTs combined compression uniaxial bending due to load eccentricity. The has been conducted both forward inverse reliability analyses. analysis calibrates of contribution in design models given NZS 3404.1, AS 4100, AS/NZS 5100.6 2327 meet target level provided ISO 2394 5104 when using API 5L products non-composite column applications. Whilst estimates required minimum number tensile tests factors are all provided. In these analyses, total 68 experimental data collected from literature utilised estimate modelling uncertainty terms bias scatter. For types, achieve similar or higher than reliability, corresponding amount material calculated Minimum spirally compression. • Capacity pipe. Results justify use existing products. Required is evaluated. support reuse reclaimed grade unknown.