Analysis of Long-Term Effects in Concrete Columns Prestressed with FRP Tendons


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Title: Analysis of Long-Term Effects in Concrete Columns Prestressed with FRP Tendons

Author(s): C.C. Choo, I.E. Harik, and H. Gesund

Publication: Special Publication

Volume: 245


Appears on pages(s): 21-36

Keywords: concrete columns; FRP tendons; long term loads; non-slender; prestressing; tensile rupture; ultimate load

Date: 4/1/2007

An analytical investigation was conducted to study the long term effects in the strength interaction (Pn-Mn) behavior of non-slender concrete columns prestressed with fiber reinforced polymer (FRP) tendons. Two long term concrete stress-strain behaviors were used and compared to the instantaneous or short term load. The expressions for the strength interaction of FRP prestressed concrete columns are derived from the strain compatibility and equilibrium conditions and are presented herein. Based on this preliminary investigation, it was concluded that the long term loadings and the tensile creep rupture of FRP tendons considerably influence the column strength. The results of the column cross sections considered herein show that disregarding long term effects may be conservative provided that rupture of FRP tendons does not occur in the columns.