Seismic Performance Of Frp Confined Rc Columns

Download or read book Seismic Performance of FRP-confined RC Columns written by Guan Lin and published by . This book was released on 2016 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under the combined action of axial compression and bending, a column section is subjected to a strain gradient. The second objective of the research was to understand and model the effect of strain gradient on the stress-strain behavior of FRP-confined concrete. With the help of a reliable three-dimensional (3D) finite element (FE) model, the axial stress distribution in FRP-confined concrete column sections under a linear strain distribution was investigated, based on which design-oriented stress-strain models for FRP-confined concrete with due consideration of the strain gradient effect were developed for both circular and square columns. The final objective of the research was to develop reliable numerical models for FRP-confined RC columns subjected to the combined action of axial compression and cyclic lateral/seismic loading. These numerical column models are based on the stress-strain models for FRP-steel-confined concrete developed in the present study as well as loading/unloading rules developed by previous researchers. A hysteretic moment-rotation model was proposed to account for the effect of fixed-end rotations. In addition, an empirical plastic hinge length model was proposed to deal with the issue of deformation localization in FRP-confined square RC columns to achieve objective predictions. The proposed numerical column models provide accurate predictions of the performance of FRP-confined RC columns, especially for the ultimate displacement and energy dissipation capacity, which are very important parameters in seismic design.