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• W1036188542 abstract "A simple method was formulated for computing the axial load vs. axial shortening relationship of pin-ended tubular members damaged by a dent and/or out-ofstraightness. The method predicts the preand post-ultimate load-shortening response, and can be used in analyzing the strength and behavior of offshore platform frames containing such damaged members. The method was developed from a parametric study and regression analysis of a database containing load-shortening data from published tests results on small-scale damaged specimens (31 load-deformation curves) and data generated from a finite element analysis (56 load-deformation curves). The effects of geometric nonlinearity and elasto-plastic material property were included in the finite element analysis of the preand post-ultimate response of damaged tubular columns. Prior to generating data for the parametric ·study and -regression analysis, the finite element model was verified by comparing calculated (finite element) loadshortening responses with small-scale test data. In order to develop a regression model to be used as a basis for the simplified engineering method, a parametric study was conducted to determine the influence of each independent variable on the axial behavior of damaged members. The object of the study was to select the shortest suitable approximating (coordinate) function for each independent variable. The variables considered were: column slenderness, D/t ratio, dentdepth to diameter ratio, out-of-straightness, yield stress, and axial shortening. The regression analysis of the load-shortening relationships in the database resulted in a set of 96 constants which is reduced to a four-term approximating function for the load-shortening response, once specific values are given for the member geometry, material and damage. The procedure is illustrated with some examples and a comparison with test results. The method is valid for member geometries and material properties typically found in fixed offshore platforms with the limitation that relatively thick-walled members should have sustained significant damage. This limitation is based on the exclusion of members which exhibit a sharply peaked load-deformation relationship. ·" @default.
• W1036188542 created "2016-06-24" @default.
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• W1036188542 date "1989-01-01" @default.
• W1036188542 modified "2023-09-26" @default.
• W1036188542 title "Axial behavior of damaged tubular columns, September 1989, 65p." @default.
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