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Construction and Building Materials 31 (2012) 353-363 2012
This paper investigates the bond behaviour of carbon and glass fiber reinforced polymers (FRP) glued on various kinds of masonry supports. It presents the results of a wide experimental campaign carried out at the Laboratory of Structures of the University of alerno (Italy). Four different types of masonry were considered. Clay-bricks as well as some natural masonry elements (i.e., tuff or
limestone, that are rather common for existing buildings in the Mediterranean Area) were employed as supports for gluing FRP sheets and perform double-shear pull-out tests. A preliminary experimental work was carried out on samples of the above entioned masonry blocks for quantifying their key mechanical properties. Thus, a wide series of masonry specimens were tested both in compression and bending for evaluating their compressive and tensile strength and determining the key statistical parameters which describe their distribution and scatter. Then, twenty-nine double-shear pull-out tests were carried out for observing the bond behaviour of FRP strips on the various masonry
substrates. Moreover, two sets of six coupon tests were performed for evaluating the actual axial stiffness of FRP plates glued on masonry samples. The paper reports the key results of the above mentioned tests with the aim of pointing out the influence of the various relevant parameters of both masonry and composite materials on the resulting bond strength. A significant influence of masonry properties was observed and quantified, whereas no
significant effect induced by the two different kinds of composite materials were actually observed. The above mentioned experimental results are employed for assessing the theoretical formula adopted by Italian Guidelines for evaluating ultimate bond strength of composite laminates glued on masonry. Finally, an alternative fully empirical relationship is calibrated on pull-out test results presented in this paper.
COMPOSITES. PART B, ENGINEERING, vol. 42; p. 705-716, ISSN: 1359-8368 15 febbraio 2011
The present paper is aimed at assessing analytical formulations and calibrating an accurate and reliable design formula for FRP-confined masonry columns. After a short introduction about the key issues regarding the confinement of masonry columns by means of composite wrapping, a wide experimental database is assembled in a second section of the paper. Such a database has been obtained by merging the test results presented by the authors in a companion paper with other ones available in the scientific literature. The content of the database, the nature of the specimens and the range of variation of the relevant parameters are reported in the paper. The most well-established analytical formulae for FRP-confined concrete members are summarised in the third section of the paper; their effectiveness when applied to confined masonry elements is investigated on the basis of the collected database. The very limited number of models currently available for masonry members are also reported and discussed; they generally result in inaccurate and non-conservative predictions, as they have been commonly calibrated on experimental results carried out on specific types of masonry. Finally, a general expression for a design-oriented formula is calibrated with respect to the above-mentioned experimental database. As a matter of principle, different levels of accuracy can be achieved in calibrating such an expression, depending on the number of parameters considered in its calibration: the higher the number of such parameters, the lower the expected residual error of the resulting formula. Thus, three different proposals of design formulae for FRP-confined masonry columns are reported and commented with the aim of describing their accuracy in terms of scatter, average error and distribution of the experimental-to-theoretical ratios.
COMPOSITES. PART B, ENGINEERING, vol. 42; p. 692-704, ISSN: 1359-8368 15 febbraio 2011
The present paper deals with the mechanical behaviour of masonry columns confined by using fibre-reinforced polymer (FRP) composites. In particular, it presents the key results of a wide experimental program jointly carried out at the Laboratories of the Universities of Salerno and Salento (Italy).
Several kinds of masonry, made out of either natural or artificial bricks having different dimensions, have been tested in this experimental programme. A total number of 54 column specimens have been built and tested in pure compression.
Moreover, several composite systems (mainly based on glass fibres) have been utilised as confining device by applying a variable number of layers that allow to develop different levels of lateral pressure.
The present paper reports the complete information about the geometric and mechanical parameters related to the tested specimens as well as the key aspects of the structural behaviour observed during the compression tests. In particular, the maximum load levels and the corresponding axial stresses and (average) strains are clearly reported.
Finally, the main differences in terms of structural response due to the behaviour of the various materials utilised for both masonry and external wrapping are highlighted. Moreover, the same experimental results, along with further experimental data already available in the scientific literature, will be quantitatively analysed in a companion paper with the aim of calibrating a design formula for determining the axial strength of masonry columns confined by FRP.
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