Effect of Elevated Temperatures on the Mechanical Performance of Pultruded FRP Joints with a Single Ordinary or Blind Bolt
Publication: Journal of Composites for Construction
Volume 20, Issue 2
Abstract
Presented in this paper is a combined experimental and analytical modeling study of the strength of pultruded fiber-reinforced polymer (FRP) single-bolted double-lap joints subjected to tensile loading and elevated temperatures. Dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) are conducted on the polymeric composite material to determine the glass transition temperature and decomposition temperature, respectively. Based on the DMA and TGA results, and to cover glass transition without any material decomposition, the six temperatures selected for the test program are , , , , , and . Three nominally identical joints are tensioned to failure at each temperature. A total of 36 double-lap joints are tested, comprising 18 joints fabricated with ordinary steel bolting and the other 18 with novel blind bolting. A comparison is made based on load-displacement curves, failure modes, and maximum (ultimate) loads. It is found that both methods of mechanical fastening experience a reduction of 85% in maximum load as the test temperature increases from to . Three proposed empirical or mechanism-based models for characterizing strength under elevated temperatures are shown to provide good predictions for the maximum loads obtained in the test program.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Australian Research Council through the Discovery Early Career Researcher Award scheme and Monash University. The authors wish to thank visiting student Miss Li Zhao from Tongji University for preparation of specimens and calibration of the kinetic parameters. Technician Mr. Long Goh of the Structural Laboratory at Monash University is acknowledged for his assistance in preparing the materials for the joint specimens.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 2 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 17, 2015
Accepted: Jun 24, 2015
Published online: Aug 13, 2015
Discussion open until: Jan 13, 2016
Published in print: Apr 1, 2016
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