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Experimental analysis of Fiber Reinforced Cementitious Matrix (FRCM) confined masonry columns

The increasing use of Fiber Reinforced methods for strengthening existing brick masonry walls and columns, especially for the rehabilitation of historical buildings, has generated considerable research interest in understanding the failure mechanism in such systems.
This dissertation is aimed to provide a basic understanding of the behavior of solid brick masonry walls unwrapped and wrapped with Fiber Reinforced Cementitious Matrix Composites. This is a new type of composite material, commonly known as FRCM, featuring a cementitious inorganic matrix (binder) instead of the more common epoxy one.
The influence of the FRCM-reinforcement on the load-carrying capacity and strain distribution during compression test will be investigated using a full-field optical technique known as Digital Image Correlation.
Compression test were carried on 6 clay bricks columns and on 7 clay brick walls in three different configuration, casted using bricks scaled respect the first one with a ratio 1:2, in order to determinate the effects of FRCM reinforcement.
The goal of the experimental program is to understand how the behavior of brick masonry will be improved by the FRCM-wrapping.
The results indicate that there is an arching action zone represented in the form of a parabola with a varying shape according to the used configuration. The area under the parabolas is considered as ineffectively confined.
The effectively confined area is assumed to occur within the region where the arching action had been fully developed.

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introduction ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ 2 I N T R O D U C T I O N OPTICAL METHODS AND FRP 0.1. Digital Image A digital image is a representation of a two-dimensional image using ones and zeros, binary code. Depending on whether or not the image resolution is fixed, it may be of vector or raster type. Without qualifications, the term digital image usually refers to raster images also called bitmap images, figure 0.1. Fig. 0.1 – Basic concept of digital image correlation Raster images have a finite set of digital values, called picture elements or pixels. The digital image contains a fixed number of rows and columns of pixels. Pixels are the smallest individual element in an image, holding quantized values that represent the brightness of a given color at any specific point.

Laurea liv.II (specialistica)

Facoltà: Ingegneria

Autore: Lorenzo Zucchini Contatta »

Composta da 313 pagine.

 

Questa tesi ha raggiunto 107 click dal 21/10/2011.

 

Consultata integralmente una volta.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.