This paper presents the experimental and theoretical characterizations of mechanical properties of glass fiber reinforced plastic (GFRP) wide flange and box beams. Static response of pultruded beams was studied by conducting a total of 187 tests and evaluating shear influence, shear lag, warping, and manufacturing quality. Experimental results revealed that fiber asymmetry and interfacial slip between fabric layers affect the beam stiffness. Experimental observations of shear lag and warping phenomena have been discussed. Test results showed that interfacial slip between adjacent glass fabric layers had a significant influence on strain measurement. Shear deflections were found to be significant in relation to bending deflections. Computations of bending and shear stiffness of GFRP beams using simplified theoretical expressions have been summarized with an example. Moment versus curvature ( M -φ) relationships for the test beams exhibited a linear relationship nearly up to failure. Failure patterns for wide flange and box beams under static loads are described.
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