Date of Award

Spring 2020

Document Type

Thesis

Degree Name

Doctor of Philosophy (PhD)

Department

Civil & Environmental Engineering

Program/Concentration

Civil Engineering

Committee Director

Zia Razzaq

Committee Member

Gene J. Hou

Committee Member

Mojtaba B. Sirjani

Committee Member

Shahin N. Amiri

Abstract

This dissertation presents an experimental and theoretical study of the lateral-torsional instability and biaxial flexure of Glass Fiber Reinforced Polymer (GFRP) beams including warping and shear deformation effects. The theoretical analysis is based on three simultaneous differential equations of equilibrium with new terms added to account for shear deformation effects. To solve these equations, algorithms based upon a central finite-difference approach are then developed. The experimental study is conducted on a series of single- and multi-span beams subjected to concentrated loads. The predicted beam behavior agreed well with that observed experimentally. The investigation revealed that the ASCE-LRFD Prestandard for pultruded GFRP beams can result in seriously unconservative buckling load predictions. The same is found for biaxially loaded beams which can develop very large induced warping normal stresses currently unaccounted for by the ACSE-LRFD Prestandard. A new lateral-torsional buckling load equation is presented which accounts for shear deformation effects.

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DOI

10.25777/asg3-cm38

ISBN

9798641418582

ORCID

0000-0002-1841-1655

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