S07 579: IN-SITU CYCLIC TESTING ON A TYPICAL URM SCHOOL BUILDING PART II: THE CONFINED MASONRY BUILDING

M. Yekrangnia1, A. Bakhshi2, M.A. Ghannad3 A. Aghababai4, M. Khanmohammadi5, and S.R. Mirghaderi6
1) Assistant Professor, Department of Civil Eng., Shahid Rajaee Teacher Training University, Tehran,
Iran, E-mail: yekrangnia@srttu.edu
2)  Associate Professor, Department of Civil Eng., Sharif University of Technology, Tehran, Iran, E-mail:
bakhshi@sharif.edu
3)  Professor, Department of Civil Eng., Sharif University of Technology, Tehran, Iran, E-mail: ghannad@
sharif.edu
4)  Assistant Professor., Department of Eng., University of Science and Culture, Tehran, Iran, E-mail:
aghababaie@usc.ac.ir
5)  Associate Professor, Department of Civil Eng., University of Tehran, Tehran, Iran, E-mail:
mkhan@ut.ac.ir
6)  Associate Professor, Department of Civil Eng., University of Tehran, Tehran, Iran, E-mail: mirghaderi@
ut.ac.ir

Keywords: In-situ static cyclic testing, Confined masonry buildings, Damage severity, Seismic performance

Abstract. This paper is the second part of a field testing on a representative masonry school building. Following the unreinforced masonry building specimen, static cyclic testing is performed on a confined masonry building exactly duplicating the corresponding latter specimen. Compared to the previous specimen which is presented in the first part of these papers, the building has extra vertical reinforced concrete ties which are considered crucial in improving the ductility capacity of these structures. Similar to the first specimen, the confined building experienced shear-sliding failure in the form of stepped-diagonal and horizontal cracks in all walls. Horizontal cracks from flexural and tensile actions in the vertical ties accompanied these damages. Nonetheless, the cracked walls maintained their integrity during the applied displacement demands thanks to the presence of the confining ties. The results of this testing indicate the failure modes and patterns of the confined masonry building is similar to those in the corresponding unconfined masonry building. However, the ultimate strength and ductility of the confined masonry specimen showed an increase of 50% and 200%, respectively.