ABSTRACT Tubular T-joints were fatigue tested with out-of-plane bending loading. Six models were tested, three models with Rratio of 0 and three with R = -1. Hot spot stress was measured for the brace and for the chord using the ECSC linear extrapolation procedure. Fatigue loading was applied in load control, to obtain through thickness cracking at a number of cycles in the range 4 000 -200 000 cycles. The data were analysed and compared with published data and with current fatigue design criteria for tubular joints. INTRODUCTION Fatigue loading on tubular offshore structures is predominately wave loading. For a design life of 20 years the number of cycles is of the order of 10 8 and the major contribution to the cumulative damage is from stress ranges corresponding to a constant amplitude life above 10 5 cycles. For this reason design SN curves for tubular joints are based on fatigue tests in the high cycle range, i.e. in the range 10 5 -1
