International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1436 DAMAGE INDICES FOR MULTISTOREY BUILDING WITH AND WITHOUT MASONRY INFILL Tejaswini Wagh 1 , R.K.Pote 2 , S.S.Kasliwal 3 1,2,3 Department of Civil Engineering SND College of Engineering & Research Center Babulgaon, Tal.Yeola Dist Nashik ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Many researchers have studied the performance of RC structures in seismic environment. Damage indices are proposed to quantify local and global structural damage of buildings, subject to base excitations on a scale ranging from zero to unity; where zero represents undamaged state and unity represents collapse injury state of the building. Infill wall can reduce the structural response during seismic excitations due to its strength and stiffness. In the present work, a RC building of ten storeys has been taken and its per- formance is evaluated under the ground motions. For the ini- tial study two basic models are being considered. First is sim- ple three storey model with masonry infill and another is sim- ple three storey model without masonry infill. The building is being analyzed by means of nonlinear time history analysis for seismic sequences using FE software SAP 2000NL. Key Words: Damage index, nonlinear time history, push- over analysis, stick model, hysteresis energy. 1. INTRODUCTION 1.1 Effects of damage on a structure: The effects of damage on structure can be classified as linear or nonlinear. A linear damage state is defined as the case when the initially linear elastic structure remains linear elas- tic after the damage. The change in modal properties are a result of changes in the geometry and / or the material prop- erties of the structure, but the structural response can still be modelled using a linear equation of motion. Non-linear dam- age is defined as the case when the initially linear-elastic structure behaves in a non-linear manner after the damage has been introduced. 2.STRUCTURE: In order to investigate the effect of masonry infill on the building against seismic activity, the following three dimen- sional RC building is taken for analysis. 2.1 Structure details: In the present study a G+9 reinforced cement concrete special moment resisting frame is considered for the analysis in ac- cordance with IS 1893 (part 1): 2016 provisions. The storey height is 3.0 m. The load per unit space of the ground, consist- ing of the ground block, finishes, etc. is 4 kN/m 2 . The intensity of live load on each floor is 3 kN/m 2 . The soil below founda- tion is hard and the building is located in Delhi. Required suitable data is assumed. Plan dimensions are as shown in figure 1. (All dimensions in m) Assumed data is as follows: Beam size for 5 m span – 230 X 450 mm, Beam size for 6.5 m span – 230 X 550 mm, Column size for initial G+2 model – 300 X 450 mm, Column size for G+9 model – 450 X 750 mm, Specific weight of infill – 20 kN/m 3 , block thickness – two hundred millimetre, Wall thickness – 230 millimetre. Fig 1. Line Plan Since the early 1970's, there has been significant research on the damage assessment of the RCC buildings. As proposed by several researchers (Park et al 1984, Chung et al 1987, Wil- liams, Sexsmith 1995, Fajfar, Vidic 1994) damage indices can be classified as local damage indices and global damage indi- ces. A local damage index is a sign of damage for a part of structure such as an element, frame or a story while a global index is an indicator of damage to the whole structure. Till now lot of research is carried out to estimate the damage of reinforced concrete structures in terms of its components. A harm model was developed by Park and Air National Guard (1985),to review the unstable harm ofconcrete member supported AN experi mental information.The damage is taken as a linear combina- tion of the maximum deformation and the absorbed hyster-etic energy.