کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1455728 | 989066 | 2006 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Cyclic modeling of FRP-confined concrete with improved ductility Cyclic modeling of FRP-confined concrete with improved ductility](/preview/png/1455728.png)
Confinement by fiber reinforced polymer (FRP) wraps can significantly enhance strength and ductility of concrete columns. Behavior of FRP-confined concrete in uniaxial compression can be characterized by its bilinear stress–strain and unique dilation properties. A number of models have in recent years been developed to capture these characteristics under monotonic loading. None, however, have addressed the cyclic response of FRP-confined concrete. A total of 24 FRP-confined concrete stub specimens were tested in uniaxial compression under different levels of loading and unloading, with different fiber type, wrap thickness, and loading patterns. Based on a regression analysis of test results, a constitutive model is developed that includes cyclic rules for loading and unloading, plastic strains, and stiffness and strength degradations. The proposed model is validated by comparing analytical predictions with experimental results of an independent test series. Good agreement was shown between the analysis and experiments, confirming the ability of the model to predict the cyclic behavior of FRP-confined concrete. The model could be easily implemented in a fiber element model for flexural analysis of cyclic loaded beam-columns in conjunction with a strain gradient approach.
Journal: Cement and Concrete Composites - Volume 28, Issue 10, November 2006, Pages 959–968