Article ID Journal Published Year Pages File Type
268610 Engineering Structures 2008 10 Pages PDF
Abstract

In this paper, the nonlinear finite element model developed and verified in the companion paper [Son J, Fam A. Finite element modeling of hollow and concrete-filled fiber composite tubes: Part 1 — model development and verification in flexure. Engineering Structures 2008;30(10):2656–66] has been used to study fiber-reinforced polymer (FRP) tubular poles partially filled with concrete in flexure. Partial filling is proposed as a low-cost alternative to using thicker-walled tubes, to enhance flexural strength and stability. The partial concrete fill length is optimized in cantilever-type mono-poles for tubes with different diameter-to-thickness (D/tD/t) ratios and different laminate structures. It was found that this optimum length is reduced in any one of the following conditions: as D/tD/t ratio becomes smaller, when fiber angles relative to the longitudinal axis in angle-ply tubes increases, when longitudinal fiber fraction in cross-ply tubes reduces, and when a laterally distributed load is applied instead of a point load at the tip. Simple expressions were established to calculate moment capacities of hollow and concrete-filled FRP tubes. They were then incorporated into a simple design approach developed to predict the optimum concrete fill length, on the basis of that failure occurs in the concrete-filled and hollow parts simultaneously. A procedure to account for tapered poles is also presented.

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Physical Sciences and Engineering Earth and Planetary Sciences Geotechnical Engineering and Engineering Geology
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