A simple procedure to manage in situ mechanical tests on masonry walls is illustrated, to join economical aspect, ease of execution and significance of testing results. The present proposal consider the use of the penetrometer PNT-G to perform on-site measurement of the compression strength of mortar joints, followed by extraction of block specimen to laboratory tests and a geometrical survey of the texture, to characterize in a wide zone of the building the components of the wall to arrange an analytical model organized in an appropriate procedure named “pile-model”. Subsequently it is proposed a collapsing test on twin panels, to calibrate the above non destructive tests and predicting model, acting on the inferior part of window openings. Two different geometrical situations of panels are considered: large windows (2,20 – 3,00 m and more) to execute twin panels under the same opening, and normal window (1,10 – 1,50 m) to execute twin panels under consecutive openings. The vertical forces, simulating permanent loads, are combined with cyclic horizontal loads, pushing between the twin panels: the vertical forces are applied in a closed system of anchorage, while the horizontal force is not diffused outside the tested panels, avoiding improper stresses on the adjacent zones of building. The shear compressive test has been repeated on a consolidated masonry panel, to characterize the improvement due to the adopted reinforcement technique. The combined use of the pile model and the opposite panel experimental procedures permits mechanical evaluations of masonry structures in buildings.

A procedure for testing masonry structures: the pile-model and the opposite panel shear compression tests

SASSU, MAURO
2008

Abstract

A simple procedure to manage in situ mechanical tests on masonry walls is illustrated, to join economical aspect, ease of execution and significance of testing results. The present proposal consider the use of the penetrometer PNT-G to perform on-site measurement of the compression strength of mortar joints, followed by extraction of block specimen to laboratory tests and a geometrical survey of the texture, to characterize in a wide zone of the building the components of the wall to arrange an analytical model organized in an appropriate procedure named “pile-model”. Subsequently it is proposed a collapsing test on twin panels, to calibrate the above non destructive tests and predicting model, acting on the inferior part of window openings. Two different geometrical situations of panels are considered: large windows (2,20 – 3,00 m and more) to execute twin panels under the same opening, and normal window (1,10 – 1,50 m) to execute twin panels under consecutive openings. The vertical forces, simulating permanent loads, are combined with cyclic horizontal loads, pushing between the twin panels: the vertical forces are applied in a closed system of anchorage, while the horizontal force is not diffused outside the tested panels, avoiding improper stresses on the adjacent zones of building. The shear compressive test has been repeated on a consolidated masonry panel, to characterize the improvement due to the adopted reinforcement technique. The combined use of the pile model and the opposite panel experimental procedures permits mechanical evaluations of masonry structures in buildings.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/189849
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