Influence of Connection Detailing on Strength of Concrete-Filled FRP Tubes Under Bending and Shear

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Title: Influence of Connection Detailing on Strength of Concrete-Filled FRP Tubes Under Bending and Shear

Author(s): Sarah Zakaib, Pedram Sadeghian, and Amir Fam

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-16

Keywords: CFFT, footing, combined loading, connection, flexure, FRP, shear, tubes

Date: 3/1/2011

Abstract:
Concrete-filled GFRP tubes (CFFTs) with and without moment connections to concrete footings were tested. The study aims at exploring the combined effect of maximum shear and maximum moment, both occurring at the same location, on the ultimate strength of CFFTs, as well as moment connection behavior in general. Testing involved simply supported and cantilever bending specimens with varying shear spans and fixed end arrangements. End conditions consisted of either direct embedment into concrete blocks with steel dowels, or mechanical clamping. For the GFRP tubes used, the study concluded that the presence of shear at the location of maximum moment near the connection in a cantilever setup does not cause reduction in flexural capacity, relative to the pure bending strength of the CFFT. The study also revealed that achieving tensile rupture of the CFFT tube does not guarantee that the full potential moment capacity of the CFFT member is reached, as slip plays a key role at the moment connection.