Axial Compression Performance of Slender Concrete-Filled Circular Steel Tubular Column with Pitting Corrosion Damage
Localized pitting corrosion damage can cause an adverse impact on the safety of concrete-filled steel tubes(CFST).This paper conducted a numerical analysis of the axial compression performance of slender CFST with pitting corrosion damage.The failure phenomenon and load-deformation relationships from the existing tests were used to verify the numerical models.Then,the verified models were extended to take the random characteristics of corrosion pits in the aspect of distribution,dimensions,and locations into account.The influence of the degree of local volume loss,material strength,and slenderness ratio on the load-deflection curves was analyzed.According to the same degree of local volume loss,the CFST with equivalent thickness loss was established.The different influences of pitting corrosion and equivalent local defect on the ultimate strength were compared.Finally,based on the equivalent thickness loss,three methods based on the Chinese codes were put forward and to calculate the axial compression performance of CFST column with pitting corrosion damage and compare with the result of FE analysis.The results show that the influence caused by different distributions of corrosion depth could be ignored.Compared with the equivalent local defect,the pitting corrosion can have a greater decrease in the ultimate strength of the slender CFST.According to the degree of local volume loss,the methods based on GB 50936-2014 could predict the ultimate strength of CFST with pitting corrosion damage,and the method based on GB 50936-2014 could provide a prediction with good accuracy and moderate consideration.
concrete-filled circular steel tubularrandom pitting corrosionaxial compression performancefinite element analysis
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