الفهرس 
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Abstract
Pultrusion is fast growing process for manufacturing fiber reinforce plastic (FRP) composits for structural application. FRP composites are mainly made of reinforcing materials such as fiber glass, carbon fibers, and aramid fibers and matrix (resin) materials such as thermsetting or thermoplastic materials. This thesis reports on a review of the literature on the raw materials of FRP sections, manufacturing process and structural analysis of such sections.
Two finite elements models are developed to trace the static response of FRP section. The first is a four node rectangular finite model with five degrees of freedom per node to study thin laminated FRP sections while the second is a four node isoparametric quadratic finite element model with five degrees of freedom also per node to analyse thick layered FRP sections. The formulation used to obtain the element stiffness matrix for the rectangular element is based on the classical lamination theory (Kirchoff hypothesis). First and third order shape functions were chosen for predicting the memberance and bending behaviour of the rectangular element model. The isoparametric quadratic model depends on the first-order shear deformation theory. Element stiffness matrices for both rectangular element model and isoparametric one include the effect of coupling between memberane and bending actions.
The developed computer program has the capability of taking an arbitrary number of layers for the analysis of plates and beams. To demonstrate the accuracy and convergence of the program, the results are compared with those obtained by others in the literature (Danielson, K. T., and Tielking, J. T. (1988), and Rao, S. S. 1989 ).
Stabe convergence and good accuracy are obtained. The effects of boundary conditions, angle of orientation of plies, number of layers, width-to-thickness ratio of plates, and the effect of coupling between memberane and bending actions on the behaviour of plates are assessed. In addition, the effect of beam shape and fiber volume fraction on the tip deflection of thin-walled FRP composite beams is evaluated.