A. Aghababaie M.1, M. Khanmohammadi 2, S.R. Mirghaderi 3, M. Yekrangnia 4, A. Bakhshi 5, and M.A. Ghannad 6
1) Assistant Professor., Department of Eng., University of Science and Culture, Tehran, Iran
E-mail: aghababaie@usc.ac.ir
2&3) Associate Professor, Department of Civil Eng., University of Tehran, Tehran, Iran
E-mail: mkhan@ut.ac.ir & mirghaderi@ut.ac.ir
4) Assistant Professor, Department of Civil Eng., Shahid Rajaee Teacher Training University, Tehran,
Iran, E-mail: yekrangnia@srttu.edu
5&6) Associate Professor, Department of Civil Eng., Sharif University of Technology, Tehran, Iran
E-mail: bakhshi@sharif.edu & ghannad@sharif.edu

Keywords: In-situ static cyclic testing; Unconfined masonry buildings; Damage severity; Failure modes.

Abstract. In this paper, the results of field tests on a typical unreinforced brick masonry building representing a widely –used existing schools in Iran, are reported. The selected building is a single-story URM school with jack-arch roof. Considering technical and executive requirements, and geometry of arrangement of classrooms in the longitudinal direction of the building, only two adjacent classrooms were separated from roof and was tested under displacement-controlled static cyclic reversal loading. The rigidity of the roof was provided by adding a reinforced concrete layer on top of the roof. The results of loads and displacements were measured all around the building using proper instruments. All well-known failure modes were observed in different piers regarding to aspect ratios, material properties, and their axial load. It was decided to again test this specimen after retrofitting activities, so the test was stopped at the top lateral drift ratio of about 0.5%. Also, the ultimate force capacity of the building was 600kN. The results of this study are compared with those of the corresponding confined masonry building which is presented in the second part of these papers in terms of damage and response.