The Fiber Reinforced Polymer (FRP) is made up of non-metallic fiber sheet (e.g. in carbon, glass, basalt, etc.) within an epoxy-based resin. The effectiveness of the FRP-confinement is demonstrated by both numerous laboratory test and real case applications. Nevertheless, the organic matrix does not allow the breathability of the substrate; which may deteriorate under specific environmental conditions related to severe level of temperature and humidity. In such a way, even if the FRP-jacket does not corrode, the FRP-confined column is exposed to decay due to the humidity formation within the substrate or degradation of the composite. The Fabric Reinforced Cementitious Matrix (FRCM) is a promising alternative in order to overcome the drawbacks related to FRP. In fact, the non-metallic open-grid does not easily corrode, the inorganic matrix has comparable chemical properties (e.g. porosity) with respect to the existing substrates. Despite the interest in composite strengthening, the analytical modelling of the FRP and FRCM confinement is lacking in the literature. In particular, FRP-based theories are often used also for FRCM. The present paper aims to report analytical models for computing the compressive strength of compo- sites-confined column. In particular, step-by-step procedures for the forecasting of the axial stress-strain relationship are discussed. Finally, the validity of the proposals is demonstrated by experimental versus theoretical comparisons
Confinement of columns with composites: Analysis-oriented models
Cascardi Alessio
2019-01-01
Abstract
The Fiber Reinforced Polymer (FRP) is made up of non-metallic fiber sheet (e.g. in carbon, glass, basalt, etc.) within an epoxy-based resin. The effectiveness of the FRP-confinement is demonstrated by both numerous laboratory test and real case applications. Nevertheless, the organic matrix does not allow the breathability of the substrate; which may deteriorate under specific environmental conditions related to severe level of temperature and humidity. In such a way, even if the FRP-jacket does not corrode, the FRP-confined column is exposed to decay due to the humidity formation within the substrate or degradation of the composite. The Fabric Reinforced Cementitious Matrix (FRCM) is a promising alternative in order to overcome the drawbacks related to FRP. In fact, the non-metallic open-grid does not easily corrode, the inorganic matrix has comparable chemical properties (e.g. porosity) with respect to the existing substrates. Despite the interest in composite strengthening, the analytical modelling of the FRP and FRCM confinement is lacking in the literature. In particular, FRP-based theories are often used also for FRCM. The present paper aims to report analytical models for computing the compressive strength of compo- sites-confined column. In particular, step-by-step procedures for the forecasting of the axial stress-strain relationship are discussed. Finally, the validity of the proposals is demonstrated by experimental versus theoretical comparisonsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
