Impact of AAC Block Masonry Infill in RC Structure Against Seismic Forces in All Zones of India

Author B. Vijaya
Co-Author V. Parimala, P. Shalini, N. Sheela, S. Vetri selvi
DOI https://ww

Country : India
Subject : Civil Engineering

Keywords : AAC Block, RCC, Seismic zones, Modeling, Analysis, Design and ETABS

Abstract

Due to the simplicity of construction and the rapid progress of work, framed structures are frequently used in building construction. Masonry infill panels are extensively used as interior and exterior partition walls due to their aesthetic and functional benefits. In India, a typical multistory building consists of reinforced concrete (RC) frameworks with Autoclaved Aerated Concrete (AAC) block masonry infills. Unreinforced masonry infill wall panels may not contribute to resisting gravity loads, but they contribute substantially in terms of increased rigidity and strength when earthquake-induced lateral loads are applied. In practise, however, the infill rigidity is typically disregarded in frame analysis, resulting in an underestimate of stiffness and natural frequency. In addition, the in-fills' energy dissipation characteristics contribute to enhanced seismic resistance.
For the purpose of analysing the effect of infill walls on seismic performance, this study considers three cases of multi-story buildings: a naked frame, a frame with infill walls, and an in- filled frame with central apertures. Modelling the infill walls using the equivalent strut approach. We performed static analysis (for gravity and lateral stresses). In this investigation, ETABS was used to execute linear finite element analysis in order to predict the behaviour of a R C high-rise frame with AAC block masonry filling. When infill stiffness is taken into account, it is observed that the seismic demand in a frame-only structure is substantially greater, with larger base shear and larger displacements. In this study, the results are described in detail.

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