Sensitivity analysis of transmission tower-line system parameters under wind and ice loads
Based on the phenomenological hysteresis model for angular steel members,a study on wind-induced collapse damage of ice-covered transmission tower-line system was carried out,and sensitivity analysis was carried out considering the uncertainty of structural parameters.A joint probability distribution model of wind speed and ice thickness was developed,and the combination of hazard effects and combination coefficients were calculated considering different recurrence periods.The results showed that the annual extreme wind speed and the annual maximum ice thickness during the ice-covered period were consistent with the generalised extreme value(GEV)distribution for wind speeds in the range of 5-10 m/s and ice thicknesses in the range of 10-20 mm.Under the combined influence of wind and ice loads,the damage of the transmission tower-line system was concentrated at the tower legs,and the failure of the main material was the main reason for the collapse of the structure.In the sensitivity analysis,the yield strength and modulus of elasticity of the ice-covered transmission tower-line system had the greatest influence on the critical collapse wind speed of the structure,and the sensitivity level was greater at 0° and 30° wind attack angles than the sensitivity level at 45° and 90°.
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