Author: Ngok, Lau-yuen
Title: Local buckling of hollow and concrete filled polygonal columns subjectedto axial compression or bending
Degree: M.Sc.
Year: 2000
Subject: Columns
Buckling (Mechanics)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Department of Civil and Structural Engineering
Pages: xi, 103 leaves : ill. (some col.) ; 30 cm
Language: English
Abstract: In this thesis the local buckling of thin-walled polygonal sections of square, pentagonal, hexagonal, heptagonal and octagonal columns subject to axial compression and uniform bending is investigated. A computer program "THIN-WALL", based on the finite strip method, was used to model the hollow polygonal tubes. Dimensionless elastic local buckling coefficients are presented for a variety of plate width-to-thickness ratios. It is shown that the dimensionless buckling stress coefficient is influenced by two parameters: the nature of the applied loading and the number of sides of the section. The buckling stress coefficient is higher for bent sections than for axially compressed ones, and this difference can be quite significant. Sections with an odd number of sides have an enhanced buckling capacity over those with an even number of sides, with pentagonal sections offering the highest capacity under either axial compression or bending. Ten specimens were also tested to failure under axial compression loading. Five specimens were hollow while five were concrete filled. The specimens ranged from square, pentagonal, hexagonal, heptagonal to octagonal in cross-section. The experimental results showed that the concrete filled tubes had an enhanced buckling capacity over that of the hollow specimens. An axial strength model, used to predict the ultimate load carrying capacity of the tubes, is finally presented. Five of them are hollow sections while the other five are filled with unbonded concrete to prevent inward local buckling.
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