LRFD Approach for FRP-Reinforced Thermoplastic Beams

Abstract

Thermoplastic beams are currently being used primarily in marine and waterfront applications, and can be used in bridges and buildings. A summary is presented of an experimental and theoretical study of the flexural behavior of a commercially available thermoplastic beam known as Seatimber with simple supports and subjected to a gradually increasing midspan concentrated load. Theoretical predictions are based on a non-linear moment-curvature analysis coupled with a central finite-difference scheme. Simplified criteria for a load and resistance factor design (LRFD) approach is outlined and its use demonstrated through analysis and design examples.

Equivalent rectangular stress distribution in thermoplastic beam design

“…In the past, researchers focused on using detailed analytical tools such as finite element modeling approach in their analyses. Although LRFD analysis was proposed as another analytical tool, 7 for the convenience of familiarity of a practicing engineer with the ultimate strength design (USD) commonly accepted tool in reinforced concrete structure analyses, 14 a new and parallel to this approach for thermoplastic beams is studied. In this study, development and use of USD for thermoplastic beams are investigated.…”

“…It was shown by Razzaq et.al. 7 that the thermoplastic beams could be designed by a load and resistance factor design (LRFD) procedure. The elastic-plastic stress analyses of thermoplastic composite beams reinforced unidirectionally by steel fibers loaded by bending moments have been performed by researchers.…”