Masonry Infill Damage Impact on Seismic Response of Reinforced Concrete Building
Tushar H. Bhoraniya1, Sharadkumar P. Purohit2
1Tushar H. Bhoraniya, Research Scholar, Civil Engineering, Department, School of Engineering, Institute of Technology, Nirma, University, Ahmedabad, Gujarat, India-382481.
2Sharadkumar P. Purohit, Professor, Civil Engineering Department, School of Engineering, Institute of Technology, Nirma University, Ahmedabad, Gujarat, India-382481.

Manuscript received on 08 April 2019 | Revised Manuscript received on 14 May 2019 | Manuscript published on 30 May 2019 | PP: 1440-1447 | Volume-8 Issue-1, May 2019 | Retrieval Number: A3305058119/19©BEIESP
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Abstract: Seismic response of Reinforced Concrete (RC) building depends on many parameters such as building’s dynamic properties, input excitation, structural configuration, irregularities of different forms etc. Conceptually, seismic response of RC building with masonry infill is determined considering it as a linear elastic system. However, damage in masonry infill, local or overall, under seismic excitation to RC building alters its seismic response. The present paper aims to study the impact of masonry infill damage on RC building’s structural response under various seismic ground excitations. A six storey RC building infilled with Autoclaved Aerated Cement (AAC) block, nowadays common, is considered in the present study. Seismic response of bare RC building with moment resisting frame and RC building infilled with AAC block are determined and are act as a reference case for the present study. Impact of masonry infill damage is incorporated in the equation of motion by (i) modifying the stiffness matrix and (ii) modifying both, stiffness matrix and damping matrix. Modification in stiffness matrix and/or damping matrix is mapped with degradation observed during experimental investigation conducted by the authors on RC frame test specimens with and without AAC block infill under half-cyclic lateral loading. Seismic response of RC building is measured in terms of peak displacement, peak inter-storey drift, peak storey shear and storey stiffness to illustrate the impact of AAC block infill damage. It has been found that AAC block infill contributes significantly to the stiffness of RC frame vis-à-vis bare RC building. Effect of AAC block infill damage represented by modification to stiffness matrix and/or damping matrix yield higher response quantities as compared to both reference cases. Present study indicates that, seismic response of RC building can be more realistically carried out with modification to stiffness & damping matrix which is mostly missing in practical analysis and design set-up.
Index Terms: RC Building, Seismic Response Analysis, AAC Block Infill, Stiffness Degradation, Rayleigh Damping.

Scope of the Article: Seismic Evaluation of Building Nonstructural Components