Design Implications of Creep and Long-Term Deflections in FRP-RC Beam-Columns

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Title: Design Implications of Creep and Long-Term Deflections in FRP-RC Beam-Columns

Author(s): A. Mirmiran, H. Erdogan, and A. Singhvi

Publication: Special Publication

Volume: 264

Issue:

Appears on pages(s): 163-178

Keywords: beam-column; creep; fiber-reinforced polymer (FRP); long-term deformations; modeling.

Date: 10/1/2009

Abstract:
While most studies have focused on short term behavior of fiber reinforced polymer (FRP)-reinforced concrete (RC) members, it is important and necessary to study their time-dependent behavior, if FRP is to be used as a viable alternative reinforcement for the infrastructure. The present study provides an analytical tool to assess serviceability issues of FRP-RC beam-columns under sustained loads. The analytical model accounts for creep of FRP-RC beams and beam-columns. The model is based on age-adjusted effective modulus method for concrete and Findlay’s model for FRP reinforcement. The model has been verified against the FRP-RC beam tests by the authors, as well as those from the literature. A detailed parametric study is then carried out to determine the effects of different types of FRP reinforcing bars on the creep of slender FRP-RC columns, and whether the ACI 318 design provisions for creep of slender RC columns is adequately safe for FRP-RC construction.