210. SHAKE-TABLE TESTING AND NUMERICAL MODELING OF PARTIALLY GROUTED REINFORCED MASONRY STRUCTURES
Name: Andreas Koutras
Grad Year: 2017
Reinforced masonry is commonly used in low-rise residential, commercial, industrial, and school buildings in North America. Although, the vast majority of these buildings in the Central and Easter US is partially grouted, the seismic performance of partially grouted reinforced masonry wall systems has not been sufficiently studied and is not well understood. The complexity of their behavior can be attributed to the heterogeneity and anisotropy introduced by the masonry blocks, block cavities, mortar joints, and grouted cells. Two full-scale, single-story, partially grouted buildings were tested on the UC San Diego Large High Performance Outdoor Shake Table to investigate the seismic behavior of such structures at a system level. The first building was designed and detailed according to current code provisions and practice. The second building featured improved design details with double side-by-side grouted vertical cells and joint reinforcement in every bed-joint. Both structures showed adequate base shear capacity, however the first one failed in very brittle manner. The second structure, on the other hand, showed superior performance with enhanced ductility. In addition, a finite element modeling approach for partially grouted structures is proposed. Smeared crack elements are combined with cohesive crack interface elements to model cracks in a discrete fashion and capture the fracture behavior of the mortar joints realistically. The finite element modeling scheme has been validated with data from quasi-static tests and the shake-table tests.
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