COTIČ, PATRICIA1; JAGLIČIĆ, ZVONKO2; KRŽAN META3; BOSILJKOV VLATKO4

1) Res. Assist., Institute of Mathematics, Physics and Mechanics, Ljubljana, Slovenia, patricia.cotic@imfm.si

2) Assoc. Prof., Univ. of Ljubljana, Fac. of Civ. and Geod. Eng., Ljubljana, Slovenia; Institute of Mathematics, Physics and Mechanics, Ljubljana, Slovenia, zvonko.jaglicic@imfm.si

3) Res. Assist., Univ. of Ljubljana, Fac. of Civ. and Geod. Eng., Ljubljana, Slovenia, meta.krzan@fgg.uni-lj.si

4) Assoc. Prof., Univ. of Ljubljana, Fac. of Civ. and Geod. Eng., Ljubljana, Slovenia, vlatko.bosiljk@fgg.uni-lj.si

Multi-leaf stone masonry in earthquake prone areas is often subjected to intensive seismic damage such as leaf detachment and structural cracking. Especially for the masonry with artistic assets, the extent of damage together with the masonry morphology should be assessed with minimal influence on the structure. To overcome this problem, we studied the performance of ground penetrating radar and infrared thermography on plastered laboratory three-leaf stone masonry walls. Gradual plaster delamination and crack propagation were taken into account by subjecting the walls to in-plane cyclic shear test and performing NDT measurements at certain loading steps. Radar was found reliable for the detection of the walls geometry and the type of connection between leaves, but could not detect small delamination. On the contrary, thermographic phase images were able to detect a delamination of only 2 mm, visualize cracks present on the plaster layer as well as subsurface cracks and the hidden texture of plastered masonry.

Keywords: Multi-leaf stone masonry, seismic damage, non-destructive testing, ground penetrating radar, infrared thermography