Originally Aired - Wednesday, September 11 • 3:00 PM - 3:25 PM
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Location: 1B
Title: Experimentally Measured Tensile Performance of Pultruded FRP at Elevated Temperatures [Outstanding Technical Paper]
Description:
As the composites industry is moving toward implementing pultruded FRP as a viable structural material, various manufacturing and construction decisions must be considered when designing FRP to comply with current building codes and standards' elevated temperature and fire performance requirements. Some examples include the type of resin, fire retardant additives, structural cross-section, and the amount and type of fiber reinforcement utilized in the composite. In the current study, the experimentally measured performance of pultruded FRP at elevated temperatures from 6 prior studies was amalgamated. These studies measured the elevated temperature performance of pultruded shapes under various loading conditions, including tension, compression, flexure, and bending under multiple different manufacturing considerations, including the fiber orientation, flame retardant additives, flame retardant surface treatments, resin, and the performance of varying cross sections under elevated temperatures. The authors carried out a subsequent and novel experimental program comprising 90 tests to provide additional information for pultruded FRP structural members, emphasizing the following design considerations: 1. Testing an elevated temperature range viable for most civil structures; and 2. Testing pultrusion angles of 0° and 90° to gain information on the strongest and weakest loading conditions. The authors concluded that strength reduction factors for elevated temperatures in ASCE 74 may need to be revised, pending the results of further testing in a broader range of available materials and shapes. In the currently reported experimental study, the authors measured a lower average tensile strength adjustment factor at 32.2 °C for coupons at a 0° pultrusion angle versus the provisions of ASCE 74 (0.89 versus 1.00, respectively) but a higher average tensile strength adjustment factor at 48.9 °C versus the requirements of ASCE 74 (0.90 versus 0.70, respectively). Therefore, the provisions of ASCE 74 may be non-conservative at lower temperatures.
Type: Technical Paper
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