Distribution of Shear Resistance Among Components of R. C. Frames with Masonry Infill Walls Containing Confined Door and Window Openings

In earthquake resistant design of r. c. frame structures with unreinforced masonry infill walls, containing different in size and position window and door openings, confining elements (tie-columns) are crucial component of seismic detailing of the structure. Having construction of the masonry infill wall without confining elements along opening edges, seismic response prediction becomes unreliable, due to uncontrolled sequenced failure mode of masonry infill walls, its out-of-plane instability, unfavorable crack distribution and premature and total dis-integration. Confining elements are not subdued to design as moment-resisting r. c. frames and their construction details are based on simple recommendations. The aim of this study is, by usage of calibrated computational micromodel in computer program ATENA 2D Eng, to determine the shear resistance distribution among components of r. c. frames with masonry infill walls, containing confined door and window openings, at damage grades in compliance with EMS-98 scale.