The authors have more then ten years experience on the application of flat jack tests on site. Single and double flat jack test were applied to measure especially the state of stress and the stress-strain behaviour of masonry walls, peculiarly historic masonries. The aim is to characterise the masonry from the mechanical point of view in order to measure parameters as Young modulus and Poisson ratio, useful for the structural analysis. In fact it is usually not allowed to carry out on site other, perhaps more significant tests (shear and compression on large scale), since they are destructive and invasive. The experience developed in the last years on several historic masonry buildings allowed to collect fairly good results, to elaborate and compare them. It seems possible to conclude that the double flat jack test, accompanied by the observation and survey of the walls, can be used to identify masonry classes defined through the elastic modulus. Furthermore some correlations can be found between elastic modulus and the sonic velocity. The authors will present an evaluation of the results, with some possible correlations between the parameters measured by sonic and flat-jack tests. Guidelines for the appropriate use and interpretation of the data collected from the performed tests are also suggested.

Use of flat-jack and sonic tests for the qualification of historic masonry

BINDA, LUIGIA;CANTINI, LORENZO;CARDANI, GIULIANA;SAISI, ANTONELLA ELIDE;TIRABOSCHI, CLAUDIA
2007-01-01

Abstract

The authors have more then ten years experience on the application of flat jack tests on site. Single and double flat jack test were applied to measure especially the state of stress and the stress-strain behaviour of masonry walls, peculiarly historic masonries. The aim is to characterise the masonry from the mechanical point of view in order to measure parameters as Young modulus and Poisson ratio, useful for the structural analysis. In fact it is usually not allowed to carry out on site other, perhaps more significant tests (shear and compression on large scale), since they are destructive and invasive. The experience developed in the last years on several historic masonry buildings allowed to collect fairly good results, to elaborate and compare them. It seems possible to conclude that the double flat jack test, accompanied by the observation and survey of the walls, can be used to identify masonry classes defined through the elastic modulus. Furthermore some correlations can be found between elastic modulus and the sonic velocity. The authors will present an evaluation of the results, with some possible correlations between the parameters measured by sonic and flat-jack tests. Guidelines for the appropriate use and interpretation of the data collected from the performed tests are also suggested.
2007
The Tenth North American Masonry Conference
9781929081288
Masonry buildings, ND and MD testing techniques, single and double flat jack tests, sonic tests
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/248260
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