Seismic Assessment of Weak Masonry Infilled R/C Frames

Abstract eng:
Experimental study of seismic behavior and damage assessment of weak masonry infilled r/c frames is presented in this paper with a main intention to contribute to the currently available experimental data. Fourteen one-half scaled one-story, one-bay models were tested under vertical and cyclic horizontal loading. Different parameters of the models in terms of geometric and mechanical properties of “weak” r/c frames and masonry infill were observed. Contribution of each parameter and their combination to the model behavior is observed through strength, stiffness, energy dissipation capacity and failure mode. The infill contribution could be defined as positive as it improves overall structural behavior of models. Robustness of masonry units along with mortar properties appeared to be a governing parameter for the infill damage severity and overall behavior of the models. Adverse effects of the infill were not observed, except in case of frame inadequate transverse reinforcement ratio. Following the EMS-98 principles, damage and failure mechanism description for each damage grade of framed-masonry system is presented. Additionally, relationship between building performance levels according to EC8 - 3 with EMS-98 damage grades and limit states of tested specimens was established, and drift threshold values are presented. For selected earthquake intensity levels specimens with masonry infill have reduced damage grades if compared to bare frames. In terms of structural safety, masonry infill has significantly contributed to collapse prevention.

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