Evaluation of Design Parameters on PBD of RC Buildings with Masonry Infills

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Evaluation of Design Parameters on PBD of RC Buildings with Masonry Infills.

Bhushan M. Raisinghani

ABSTRACT

Masonry infills are provided in almost all residential buildings as enclosure. The
building analysis and designs are carried out considering a representative
empirical time period. The yield strength of URM infilled frames is much higher,
and yield displacement is smaller for bare frames, providing higher ductility. The
extent of damage to infill elements define the hazard level imposed and the
corresponding risk associated with it. In this paper, the performance of RC building
with infills is evaluated using pushover analysis for various seismic hazard levels
and loading patterns as per ATC40 & FEMA356 in ETABS. A seven storey regular
RC building is located in seismic zone-V (IS1893-0.36 g). The parameters of
evaluation include time period formula, modelling technique of infill, masonry units
used in practice, and location of openings in building. The code provisions for open
ground storey buildings have been evaluated for performance assessment. Under
0.36 g hazard level, the building frame satisfied Life Safety performance objective
under the three lateral loading patterns. It is found that AAC masonry blocks
least affect the performance of frame elements and also the required failure mode for
the structure.

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