Analysis of calculation method of critical loads for local buckling of I-section FRP members

doi:10.19936/j.cnki.2096-8000.20210828.001

Abstract

Abstract: The prediction accuracies of the seven generic closed-form solutions recommended by Kollar, Qiao, Cardoso, Pecce, ASCE, Strongwell and Creative corporations which can be used to predict the local buckling loads of I-section FRP members are evaluated according to test results published in the literature. The results show that the closed-form equations recommended by ASCE and Cardoso are too conservative with corresponding average absolute errors (AAE) of 53% and 49%, approximately. The equation recommended by Strongwell is the most unconservative of all equations with AAE of 60%. The equations recommended by Pecce and Creative are established based on ASCE equations, and the corresponding coefficients are used to improve prediction accuracy. However, the two equations cannot reflect the mechanical mechanism of local buckling failure of FRP members, and the corresponding coefficients have no specific mechanical implication. The AAE values of the two equations from Pecce and Creative are 17% and 15%, respectively. The two solutions provided by Kollar and Qiao are developed based on the discrete element method and the constraint stiffness between flange and web is taken into account. The AAE values of the two equations from Kollar and Qiao are 17% and 18%, respectively. Considering the mechanical implication and prediction accuracy, the closed-form solution developed by Kollar is recommended to be used to predict the local buckling loads of I-section FRP members.

Key words: FRP members, local buckling, critical load, prediction accuracy, composites

CLC Number:

TB332

ZHAN Yang, LI Ben-ben, CUI Jing, YANG Ya-qiang. Analysis of calculation method of critical loads for local buckling of I-section FRP members[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(8): 5-10.

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