journal of scientific research in allied...

Baravkar A. B. et al., Jour. Sci. Res. Allied Sci., 3 (6), 2017, 413-422 2017

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Journal Of Scientific Research

in Allied Sciences

Contents available at: www.jusres.com

SEISMIC ANALYSIS AND DESIGN OF BUILDING WITH SHEAR WALL BY USING ETAB’S Amit Balaso Baravkar, Mane Yogesh A., Narale Kiran K., Mahadik Akshay, Thakare Yogesh V., Baravkar Avinash D. Civil Department & Pune University

ARTICLE INFO ABSTRACT ORIGINAL RESEARCH ARTICLE Article History Received: October 2017 Accepted: Nov’ 2017

The current version of the IS: 1893-2002 requires that practically all multi storied buildings be analyzed as three-dimensional systems. Buildings may be considered as asymmetric in plan, in mass and stiffness along storey, of the buildings. Most of the hilly regions of India are highly seismic. In this study, 3D analytical model of G+15 storied buildings have been generated for symmetric and asymmetric building models and analyzed using structural analysis tool ETABS software. Mass and stiffness are two basic parameters to evaluate the dynamic response of a structural system. Multi-storied buildings are behaved differently depending upon the various parameters like mass-stiffness distribution, foundation types and soil conditions. 2001 Bhuj earthquake in Gujrat, India demonstrated the damage and collapse of the buildings due to the irregularities in structural stiffness and floor mass. This paper is concerned with the effects of various vertical irregularities on the seismic response of a structure. The objective of the project is to carry out Response spectrum analysis (RSA) of regular and irregular RC building frames and Time history Analysis (THA) of regular RC building frames and carry out the ductility based design using IS 13920 corresponding to response spectrum analysis. Comparison of the results of analysis of irregular structures with regular structure is done.

Keywords: Symmetric, Asymmetric structures, Dynamic analysis, Storey Deflection, Storey Shear, Base Shear Corresponding Author: Amit Balaso Baravkar*

©2017, www.jusres.com

Introduction ETAB’S Means Extended Three

Dimensional Analysis of Building System. ETAB’S only used for RCC FRAMED STRUCTURE. Now a day in the market for RCC Framed structure also mostly used ETAB’S. It is used for a multi-story building.In ETAB’S Multi-Storeyed building Analysis and Design by using various parameters. The analysis of the building for seismic loading with two different Zones (Zone-I, II, III, V) is

considered with a soil I, II, III, V types. Shear wall is structural members used to elongate the strength of RCC structures shear wall are added to the building interior to provide more strength and strength and stiffness to the building when the exterior walls cannot provide sufficient strength and stiffness. Symmetrical buildings, the center of gravity and center of rigidity coincide so that the shear walls are placed symmetrically over the outer edges or inner edges. The decision regarding provision of shear wait to


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resist lateral forces play most important role in choosing the appropriate structural system for given project.

Structural analysis is mainly concerned with finding out the behavior of a structure when subjected to some action. The dynamic loads include wind, waves, traffic, earthquakes, and blasts. Any structure can be subjected to dynamic loading. Structural symmetry can be a major reason for buildings poor performance under severe seismic loading, asymmetry contributes significantly to increased lateral deflections, increased member forces and ultimately the buildings collapse.

This project is concerned with the study of seismic analysis and design of multi-storey symmetric and asymmetric building. The structural analysis of G+15 story reinforced concrete symmetrical and asymmetrical frame building is done with the help of Etabs software. The building is assumed as a commercial building. In the present study, The Response spectrum analysis (RSA) of regular and irregular RC building frames compare the results and Time History Analysis (THA) compare with Response spectrum analysis of regular building and carry out the ductility based design. Concept of regular and irregular configuration

To perform well in an earthquake a building should possess four main attributes namely simple and regular configuration and adequate lateral Strength, stiffness, and ductility. Current earthquake codes define structural configuration as either regular or irregular in terms of size and shape of the building, the arrangement of the structural and non-structural elements within the structure, distribution of mass in the building etc. A building shall be considered as irregular for the purposes of this standard if at least one of the conditions is applicable as per IS 1893(part1):2002

A. Plan Irregularity: Asymmetric or plan irregular structures are those in which seismic response is not only translational but also torsional, and is a result of stiffness and/or mass eccentricity in the structure. Asymmetry may, in fact, exist in a nominally symmetric structure because of uncertainty in the evaluation of center of mass and stiffness, inaccuracy in the measurement of the dimensions of structural elements B. Vertical Irregularity: Vertical irregularity results from the uneven distribution of mass, strength or stiffness along the elevation of a building structure. Mass and Stiffness irregularity results from a sudden change in mass and stiffness between adjacent floors respectively. Objectives 1. To study irregularities in structures

analyze and design of G+15 storied structure as per code provision.

2. Analyze the buildings in Etabs software to carry out the story deflection, story drift, story shear force and base shear of regular and irregular structures using response spectrum analysis and compare the results of different structures

3. Time history analysis subjected to intermediate frequency ground motion for the response of regular buildings and compare with response spectrum analysis.

4. Ductility-based earthquake-resistant design as per IS 13920

Definitions a) Storey

When the multi-story building or the residential building is constructed in that when the floor to floor gap will be there that is the story. b) Storey Shear

We will calculate all the lateral loads at each floor of the building. c) Story Drift

Defined as the difference in lateral deflection between two adjacent stories.


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During an earthquake, large lateral forces can be imposed on structures; Lateral deflection and drift have three primary effects on a structure; the movement can affect the structural elements (such as beams and columns); the movements can affect non-structural elements (such as the windows and cladding); and the movements can affect adjacent structures. Without proper consideration during the design process, large deflections and drifts can have adverse effects on structural elements, nonstructural elements, and adjacent structures. d) Center of mass

It is the unique point at the center of a distribution of mass in space that has the property that the weighted position vectors relative to this point sum to zero. In analogy to statistics, the center of mass is the mean location of a distribution of mass in space. According to IS: 1893-2002, the center of mass is the point through which resultant of

the masses of a system acts. This point corresponds to the center of gravity of masses of the system. Earthquake-induced lateral force on the floor is proportional to mass. Hence, resultant of this force passes through the center of mass of the floor. e) Center of rigidity

It is the stiffness centroid within a floor-diaphragm plan. When the center of rigidity is subjected to lateral loading, the floor diaphragm will experience only translational displacement. Other levels are free to translate and rotate since behavior is coupled both in plan and along the height. As a function of structural properties, the center of rigidity is independent of loading. According to IS1893-2002, Centre of stiffness, for a one-story building can be defined as the point on the floor through which lateral force should pass in order that floor undergoes only rigid body translation, with no rigid body rotation.

Design & Analysis Layout of structure Frame structure:


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Shear wall structure:


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Figure 6 element of shear wall General data: Frame structure data:


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Result

Analysis results of Frame Structure


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CONCLUSION: � The displacement is decreased in shear

wall structure as compared to frame structure

� The story stiffness is more in shear structure than the frame structure.

� The story drift is decreased in shear wall structure than the frame structure.


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� The modal period and frequency are less in frame structure & more in the shear wall structure.

� The story acceleration is more in shear structure than the frame structure.

� From this analysis and design, we can conclude that the performance of the shear structure is battered than the frame structure.

� The cost of the frame structure may be less than the shear structure

� The shear structure is suitable in earthquake prone area due to its higher stiffness & less displacement.

The structure with the shear wall will increase the performance than the structure without shear wall because of the center of mass and center of gravity becomes closer. When the shear wall is placed on an edge long period of building increases. References 1 Abhay Guleria (2014): Structural Analysis

of a Multi-Storeyed BuildingUsing ETABS for different Plan Configurations”, International Journal of Engineering Research & Technology (IJERT), Vol. 3 Issue 5, May – 2014

2 Raghunandan MH and Suma (2015): Seismic Pounding between Adjacent RC Buildings with and without Base Isolation System, International Journal of Research in Engineering and Technology, Volume: 04 Issue: 06 | June-2015.

3 Sukumar Behera, (2012): Seismic Analysis of Multi-storey Building with

Floating Column, National Institute of Technology Rourkela, May-2012.

4 Mr. N. B. Baraskar & Prof. U. R. Kawade (2015): Structural Performance of RC Structural wall system Over conventional Beam-Column System in G+15 story Building”, International Journal of Engineering Research and General Science Volume 3, Issue 4, July-August, 2015,

5 Miss. Rupali A.Dhote, Asst. Prof. G. B. Bhaskar (2016): Design& Analysis of Soft Storey Building due to wind & Earthquake”, International Journal for Technological Research in Engineering Volume 3, Issue 9, May-2016.

6 Hiten L. Kheni, Anuj K. Chandiwala(2014): Seismic Response of RC Building with Soft Stories”, International Journal of Engineering Trends and Technology (IJETT) – Volume 10 Number 12 - Apr 2014

7 Sagar R Padol, Rajashekhar S. Talikoti (2015): Review Paper on Seismic Responses of Multi-story R.c.c Building with Mass Irregularity”, IJRET: International Journal of Research in Engineering and Technology, Volume: 04 Issue: 03 | Mar-2015.

8 D. R. Panchal and P. M. Marathe (2011): Comparative Study of R.C.C, Steel, and Composite (G+30 Storey) Building”, Institute of Technology, Nirma University, Ahmadabad, December 2011.

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