• Home
  • Submit Paper
  • Check Paper Status
  • Download Certificate/Paper
  • FAQs
  • Feedback
  • Contact Us
Email: ijraset@gmail.com
IJRASET Logo
Journal Statistics & Approval Details
Recent Published Paper
Our Author's Feedback
 •  ISRA Impact Factor 7.894       •  SJIF Impact Factor: 7.538       •  Hard Copy of Certificates to All Authors       •  DOI by Crossref for all Published Papers       •  Soft Copy of Certificates- Within 04 Hours       •  Authors helpline No: +91-8813907089(Whatsapp)       •  No Publication Fee for Paper Submission       •  Hard Copy of Certificates to all Authors       •  UGC Approved Journal: IJRASET- Click here to Check     
  • About Us
    • About Us
    • Aim & Scope
  • Editorial Board
  • Impact Factor
  • Call For Papers
    • Submit Paper Online
    • Current Issue
    • Special Issue
  • For Authors
    • Instructions for Authors
    • Submit Paper
    • Download Certificates
    • Check Paper Status
    • Paper Format
    • Copyright Form
    • Membership
    • Peer Review
  • Past Issue
    • Monthly Issue
    • Special Issue
  • Pay Fee
    • Indian Authors
    • International Authors
  • Topics
ISSN: 2321-9653
Estd : 2013
IJRASET - Logo
  • Home
  • About Us
    • About Us
    • Aim & Scope
  • Editorial Board
  • Impact Factor
  • Call For Papers
    • Submit Paper Online
    • Current Issue
    • Special Issue
  • For Authors
    • Instructions for Authors
    • Submit Paper
    • Download Certificates
    • Check Paper Status
    • Paper Format
    • Copyright Form
    • Membership
    • Peer Review
  • Past Issue
    • Monthly Issue
    • Special Issue
  • Pay Fee
    • Indian Authors
    • International Authors
  • Topics

Ijraset Journal For Research in Applied Science and Engineering Technology

  • Home / Ijraset
  • On This Page
  • Abstract
  • Introduction
  • Conclusion
  • References
  • Copyright

Influence of Discontinuous Diaphragm Characteristics on The Seismic Behaviour of Irregular RC Structure using ETABS

Authors: Phadatare Pushpa P., Kadlag Vishwajeet

DOI Link: https://doi.org/10.22214/ijraset.2022.43675

Certificate: View Certificate

Abstract

Researchers of past and present earthquake had damage to the R.C. structural buildings that fairly exposed to the damage and sudden breakdown of RC structure during lower and stronger ground motion. Diaphragm act as roof and roof system in concrete based reinforced building under seismic loading, these diaphragm transfers the series of lateral loads to the vertical members. In the present study, an seismic behaviour of irregular RC structures attempt is made study the behaviour of various parameters associated with diaphragm on the seismic behaviour of RC framed structure. Attempts are made to study the effect of discontinuities namely story displacement, story shears, with comparing seismic behaviour of irregular RC structures namely plus shaped with regular rectangle shaped multi storied building

Introduction

I. INTRODUCTION

In multi storied framed building, damages from earthquake generally initiates at locations structural weakness present in lateral load resisting frames. This behaviour of multi-storey framed building during strong earthquake motions depends upon distribution of mass, stiffness, strength in both the horizontal and vertical planes of building. In few cases, these weaknesses may be created by discontinuities in stiffness, strength or mass along the diaphragm. Such discontinuities between diaphragm are often associated with sudden variations in the frame geometry along the length of the building. Structural engineers have developed confidence in the design of building in which the distribution of mass, stiffness and strength are more or less uniform. There is less confidence about the design of structures having irregular.

II. SCOPE OF THE PRESENT STUDY

In present study, a typical multi story building is analysed using commercial software ETABS 2018 for nonlinear dynamic analysis in seismic region, all the analysis has been carried out considering the diaphragm discontinuity and the result so obtained have been compared. This study is done for RCC framed multi story building with fixed support conditions. The results of this report is based on one original RCC building which is planned in zone-II which I am going to analysed in zone-III.

III. METHODOLOGY

  1. A thorough literature review to understand the seismic evaluation of building structures and application of ETABS analysis
  2. Select an existing building with diaphragm discontinuity.
  3. Design the building using dynamic analysis methods.
  4. Analyse the results and arrive at conclusions.

IV. MODELLING OF BUILDING

A. Introduction

In this project we are studying a multi storey building with diaphragm discontinuity as model-1 and model-2 respectively. The building is modelled and designed in ETABS 2018 from which reinforcing details were drawn.

B. Details Of Selected Building

For study purpose, an existing building plan which is made up for Zone-II is taken for Zone-III for study purpose. Detailes are given below.

C. Details of Building

Building parameters

Details

Plan size

19.91*17.48m

Location

Pune

Usage

Residential buildimg

Floor height

2.8m

Grade of steel

Fe500

Grade of concrete

M-30

Seismic zone

III

Column dimension

300mm*750mm

Beam dimension

  1. 230mm*700mm
  2. 230mm*900mm

Slab thickness

  1. 150mm
  2. 120mm

Wall thickness

200mm

Soil type

Medium (type-2)

Importance factor

1.5

Response reduction factor

5 (specified)

Dead load

1 KN/m²

Live load

1 KN/m²

Table I: Details of the building

D. Design of the Building (Rectangle and plus (+) shaped Building Structures

In the last paper, we have studied about regular rectangular building was compared with regular C-shaped and regular L-shaped building structure. Further the building is compared with regular plus shaped with regular rectangular building shaped with same geometric details of the structure as given in table I.

In fig.1 for model I and fig.2 for Model II, discontinuous diaphragm is assigned for overall building, the structure is opened at centre. Loads are assigned and building is analysed. The value for story displacement, story shear, story stiffnesses are going to compare.

  1. Case I: Maximum story displacement for rectangular and plus shaped building along X and Y direction

Fig.3 shows the graphical representation of maximum story displacement for rectangular and plus shaped building. This graph shows the value of maximum story displacment values from story 5 to story 10 for the comparison. Series 1 gives the value of displacement for model II along Y-direction, series 2 gives the value of displacment for model I along Y-direction, series 3 gives the value of displacement for model I along X-direction, series 4 gives the value of displacement for model II along X-diection..

From the above showed graph, we can see the value for model 2 building for story 5 is 1.882mm which is less than that of model I for the same story which is 4.769mm along Y-direction. Similarly, the value for model II for story 5 is 11.724mm which is less than that of model I for the same story which is 12.563mm.

Therefore, from the above said model II which is irregular (+ shaped building with discontinuous diphragm) still  is effective than that of model I (regular rectangular building with discontinuous diaphragm)

For the further study about effectiveness of these model I and model II, we will discuss the other parameters like story shears and story stiffness for this 2 model

2. Case-II: Story shear for model I (rectangular) and model II (plus shaped building) along X-direction

Fig-4 shows the graphical representation of story shear for model I and model II. This graph shows the value of story shear values from base to story 19 for comparison. Storeys are shown along X-direction. Story shear value for model I is -468.298 KN which is less than the value for model II which is -368.924 KN. Negative shear would mean the cracks here run downwards, and if the shear would be positive, they would run upwards. As per the value of story shear for model I and Model II, model I which is regular rectangle which we can prefer at seismic region for zone III. For the better conclusion we can go for case III

Case-III: Overturning moment for model I and model II

Fig. 5 shows the graphical represenatation of overturning moment for model I and Model II. The graph shows the value of overturning moment for model I and model II from base to story 19. The value for overturning moment for model I is 359584 kN.m which is more than that of model II which is 243854 kN.m. As per the IS code both the values are ok for the safe condition. But more preferably the model II gives better result.

V. ACKNOWLEDGMENT

I am thankful to my guide, Assistant Professor, Mr. Kadlag Vishwajeet, department of civil engineering, Dr. D. Y. P. school of engineering and technology, Lohgaon-Pune, for his constant encouragement and able guidance. Also, I thank my parents, friends etc. for their continuous support in making this work complete.

Conclusion

A. From the above showed fig. 3, we can see the value for model 2 building for story 5 is 1.882mm which is less than that of model I for the same story which is 4.769mm along Y-direction. Similarly, the value for model II for story 5 is 11.724mm which is less than that of model I for the same story which is 12.563mm. B. Story shear value for model I is -468.298 KN which is less than the value for model II which is -368.924 KN. Negative shear would mean the cracks here run downwards, and if the shear would be positive, they would run upwards. As per the value of story shear for model I and Model II, model I which is regular rectangle which we can prefer at seismic region for zone III. C. The value for overturning moment for model I is 359584 kN.m which is more than that of model II which is 243854 kN.m. As per the IS code both the values are ok for the safe condition. But more preferably the model II gives better result.

References

[1] Ravi Kumar C M, Babu Narayan K S, Sujith B V, Venkat Reddy” Effect of Irregular Configurations on Seismic Vulnerability of RC Buildings “International Journal of Engineering Research & Technology (IJERT), Volume 3 Issue [2] S. Varadharajan, V.K. Sehgal, and B. Saini “Review of different Structural irregularities in buildings” Journal of Structural Engineering Vol. 39, No. 5, December 2012 - January 2013 pp. 393-418 [3] Rakesh Sakale1, R K Arora1 and Jitendra Chouhan “Seismic Behaviour Of Buildings Having Horizontal Irregularities” ASCE Journal of Structural Engineering, Vol. 132, No. 11, 2006, pp. 1732–1744. [4] Momen M. M. Ahmed, Shehata E. Abdel Raheem, Mohamed M. Ahmed and Aly G. A. Abdel-Shafy, “Irregularity Effects on The Seismic Performance Of L-Shaped Multi-Story Buildings” Journal of Engineering Sciences Assiut University Faculty of Engineering Vol. 44 No. 5 PP. 513 – 536, August 2016.. [5] Babita Elizabeth Baby, Sreeja S “Analysis of Buildings with Slab Discontinuity” International Journal of Science and Research (IJSR) December 2015 ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2015): 6.391 [6] Mohaiminul Haque, Sourav Ray, Amit Chakraborty, Mohammad Elias, Iftekharul Alam1 “Seismic Performance Analysis of RCC Multi-Storied Buildings with Plan Irregularity” American Journal of Civil Engineering 2015, 4(2): 52-57

Copyright

Copyright © 2022 Phadatare Pushpa P., Kadlag Vishwajeet. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Download Paper

Authors : 9422359934

Paper Id : IJRASET43675

Publish Date : 2022-05-31

ISSN : 2321-9653

Publisher Name : IJRASET

DOI Link : Click Here

About Us

International Journal for Research in Applied Science and Engineering Technology (IJRASET) is an international peer reviewed, online journal published for the enhancement of research in various disciplines of Applied Science & Engineering Technologies.

Quick links
  • Privacy Policy
  • Refund & Cancellation Policy
  • Shipping Policy
  • Terms & Conditions
Quick links
  • Home
  • About us
  • Editorial Board
  • Impact Factor
  • Submit Paper
  • Current Issue
  • Special Issue
  • Pay Fee
  • Topics
Journals for publication of research paper | Research paper publishers | Paper publication sites | Best journal to publish research paper | Research paper publication sites | Journals for paper publication | Best international journal for paper publication | Best journals to publish papers in India | Journal paper publishing sites | International journal to publish research paper | Online paper publishing journal

© 2022, International Journal for Research in Applied Science and Engineering Technology All rights reserved. | Designed by EVG Software Solutions