Discussion of "Web Buckling in Pultruded Fiber-Reinforced Polymer Deep Beams Subjected to Concentrated Loads" by David T. Borowicz and Lawrence C. Bank

作者：Zureick Abdul Hamid^*

来源：Journal of Composites for Construction, 2015, 19(3): 07015001.

DOI：10.1061/(ASCE)CC.1943-5614.0000360

• Bearing plate
• Buckling failure
• Concentrated loads
• Deep FRP beams
• Digital image correlation

Five 609.5-mm deep fiber-reinforced polymer (FRP) beams with a span-to-depth ratio of 4: 1 were tested in three-point bending with the beam ends constrained to prevent global failure. A concentrated load was applied at midspan either directly to the top flange or through a 101.6 mm wide by 12.7-mm thick FRP bearing plate resting on the top flange. VIC-3D Digital Image Correlation Measurement Software from Correlated Solutions captured out-of-plane displacement of the webs, and Southwell plots were generated to determine buckling loads. Each specimen experienced a stability failure of the web before undergoing material failure in the upper web-flange junction. On average, web buckling occurred at 90% of the ultimate load. The introduction of a bearing plate did not significantly affect the buckling load or ultimate capacity of the specimens. One specimen was tested into the postbuckling range, unloaded, and reloaded to material failure and experienced no loss of strength or stiffness. Another specimen with significant damage to the unloaded web-flange junction was tested and compared with a virgin sample. The damaged sample experienced no significant loss of strength or stiffness. Comparisons of experimental data with three theoretical equations for web-buckling capacity of FRP beams are provided.

• 出版日期2015-6