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Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into Footings

Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into... A moment connection of concrete-filled fibre reinforced polymer (FRP) tubes (CFFTs) to concrete footing is explored. The CFFTs are directly embedded into the footings to develop their full moment capacity, in lieu of using mechanical connections, dowel reinforcing bars, or posttensioning methods. CFFT specimens of 219 mm diameter (D) were embedded into footings, at various depths, ranging from 0.3D to 1.5D. The CFFT cantilevered specimens were then laterally loaded to failure. The objective was to establish the critical embedment length, which was found to be 0.73D. Shorter embedment lengths resulted in a bond failure associated with excessive slip, where the full flexural strength of CFFTs was not reached. Specimens with the critical or longer embedment lengths have achieved flexural tension failure of the CFFT, just outside the footing. Ancillary push-through tests were also carried out using CFFT stubs embedded into concrete footings, throughout the full thickness of the footing, and tested under concentric compression loads. The objective was to establish the bond strength between the GFRP tube and concrete footing, which was found to be 0.75 MPa. The bond strength and critical embedment length will vary from case to case. As such, the parameters affecting their values have been identified. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Structural Engineering SAGE

Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into Footings

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Publisher
SAGE
Copyright
© 2008 SAGE Publications
ISSN
1369-4332
eISSN
2048-4011
DOI
10.1260/136943308786412023
Publisher site
See Article on Publisher Site

Abstract

A moment connection of concrete-filled fibre reinforced polymer (FRP) tubes (CFFTs) to concrete footing is explored. The CFFTs are directly embedded into the footings to develop their full moment capacity, in lieu of using mechanical connections, dowel reinforcing bars, or posttensioning methods. CFFT specimens of 219 mm diameter (D) were embedded into footings, at various depths, ranging from 0.3D to 1.5D. The CFFT cantilevered specimens were then laterally loaded to failure. The objective was to establish the critical embedment length, which was found to be 0.73D. Shorter embedment lengths resulted in a bond failure associated with excessive slip, where the full flexural strength of CFFTs was not reached. Specimens with the critical or longer embedment lengths have achieved flexural tension failure of the CFFT, just outside the footing. Ancillary push-through tests were also carried out using CFFT stubs embedded into concrete footings, throughout the full thickness of the footing, and tested under concentric compression loads. The objective was to establish the bond strength between the GFRP tube and concrete footing, which was found to be 0.75 MPa. The bond strength and critical embedment length will vary from case to case. As such, the parameters affecting their values have been identified.

Journal

Advances in Structural Engineering – SAGE

Published: Oct 1, 2008

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