Date of Award

Fall 2015

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Civil/Environmental Engineering

Committee Director

Zia Razzaq

Committee Member

Chae Yunbyeong

Committee Member

Mojtaba Sirjani

Abstract

This thesis presents the outcome of a study of the behavior and strength of pultruded glass fiber reinforced polymer (FRP) I-section columns including uniaxial and biaxial applied bending moments. Also included in the study is a critical assessment of ASCE-LRFD Pre-standard for pultruded FRP structures in view of the rigorous analysis presented herein. The theoretical solution is based on a system of three coupled differential equations of equilibrium combined with pinned flexural and torsional boundary conditions. Effects of induced warping due to second-order terms as well as initial out-of-straightness are accounted-for in the governing differential equations. Detailed investigations into the nonlinear response up to material cracking are conducted for centrally loaded column, uniaxially loaded beam-columns loaded about the cross-sectional minor axis and those loaded about the major axis with continuous lateral support, and biaxially loaded beam-columns. Serious flaws in the ASCE-LRFD Pre-Standard are found in light of the rigorous analysis presented in this thesis such as the strength prediction expressions for centrally loaded columns as well as those with uniaxial and biaxial bending. It is also found that induced warping normal stresses due to second-order torsional effects are not negligible. The results presented herein can aid in the development of accurate strength prediction formulae to replace the flawed ones in the ASCE-LRFD Pre-Standard.

ISBN

9781339461670

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