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Title: :  EFFECT OF SETBACK ON RC FRAMED BUILDINGS
PaperId: :  4564
Published in:   International Journal Of Advance Research And Innovative Ideas In Education
Publisher:   IJARIIE
e-ISSN:   2395-4396
Volume/Issue:    Volume 3 Issue 2 2017
DUI:    16.0415/IJARIIE-4564
Licence: :   IJARIIE is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Author NameAuthor Institute
CHETAN KUMARBHAGWANT UNIVERSITY
Nitin KumarBHAGWANT UNIVERSITY
T.N. PANDAYBHAGWANT UNIVERSITY
BHARAT PHULWARIBHAGWANT UNIVERSITY

Abstract

Civil Engineering
Geometric Irregularity, Setback building, Fundamental period, Regularity index, Correction factor
The motion of the ground during earthquake do not damage the building by impact or by any external force, rather it impacts the building by creating an internal inertial forces which is due to vibration of building mass. The magnitude of lateral force due to an earthquake depends mainly on inertial mass, ground acceleration and the dynamic characteristics of the building. To characterize the ground motion and structural behaviour, design codes provide a Response spectrum. Response spectrum conveniently describes the peak responses of structure as a function of natural vibration period. Therefore it is necessary to study of natural vibration period of building to understand the seismic response of building. The behaviour of a multi-storey framed building during strong earthquake motions depends on the distribution of mass, stiffness, and strength in both the horizontal and vertical planes of the building. In multi-storeyed framed buildings, damage from earthquake ground motion generally initiates at locations of structural weaknesses present in the lateral load resisting frames. In some cases, these weaknesses may be created by discontinuities in stiffness, strength or mass between adjacent storeys. Such discontinuities between storeys are often associated with sudden variations in the frame geometry along the height. There are many examples of failure of buildings in past earthquakes due to such vertical discontinuities. A common type of vertical geometrical irregularity in building structures arises from abrupt reduction of the lateral dimension of the building at specific levels of the elevation. This building category is known as the setback building. Setback buildings with geometric irregularity (both in elevation and plan) are now increasingly encountered in modern urban construction. Setback buildings are characterised by staggered abrupt reductions in floor area along the height of the building, with consequent drops in mass, strength and stiffness. Height-wise changes in stiffness and mass render the dynamic characteristics of these buildings different from the ‘regular’ building. Many investigations have been performed to understand the behaviour of irregular structures as well as setback structures and to ascertain method of improving their performance. This study presents the design code perspective of this building category. Almost all the major international design codes recommend dynamic analysis for design of setback buildings with scaled up base shear corresponding to the fundamental period as per the code specified empirical formula. However, the empirical equations of fundamental period given in these codes are a function of building height, which is ambiguous for a setback building. It has been seen from the analysis that the fundamental period of a setback building changes when the configuration of the building changes, even if the overall height remains the same. Based on modal analysis of 90 setback buildings with varying irregularity and height, the goal of this research is to investigate the accuracy of existing code-based equations for estimation of the fundamental period of setback buildings and provide suggestions to improve their accuracy. This study shows that it is difficult to quantify the irregularity in a setback building with any single parameter. Also, this study indicates that there is very poor correlation between fundamental periods of three dimensional buildings with any of the parameters used to define the setback irregularity by the previous researchers or design codes. The way design codes define setback irregularity by only geometry is found to be not adequate. Period of setback buildings are found to be always less than that of similar regular building.

Citations

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IJARIIE CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. "EFFECT OF SETBACK ON RC FRAMED BUILDINGS" International Journal Of Advance Research And Innovative Ideas In Education Volume 3 Issue 2 2017 Page 3060-3065
MLA CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. "EFFECT OF SETBACK ON RC FRAMED BUILDINGS." International Journal Of Advance Research And Innovative Ideas In Education 3.2(2017) : 3060-3065.
APA CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, & BHARAT PHULWARI. (2017). EFFECT OF SETBACK ON RC FRAMED BUILDINGS. International Journal Of Advance Research And Innovative Ideas In Education, 3(2), 3060-3065.
Chicago CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. "EFFECT OF SETBACK ON RC FRAMED BUILDINGS." International Journal Of Advance Research And Innovative Ideas In Education 3, no. 2 (2017) : 3060-3065.
Oxford CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. 'EFFECT OF SETBACK ON RC FRAMED BUILDINGS', International Journal Of Advance Research And Innovative Ideas In Education, vol. 3, no. 2, 2017, p. 3060-3065. Available from IJARIIE, http://ijariie.com/AdminUploadPdf/EFFECT_OF_SETBACK_ON_RC_FRAMED_BUILDINGS_ijariie4564.pdf (Accessed : ).
Harvard CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. (2017) 'EFFECT OF SETBACK ON RC FRAMED BUILDINGS', International Journal Of Advance Research And Innovative Ideas In Education, 3(2), pp. 3060-3065IJARIIE [Online]. Available at: http://ijariie.com/AdminUploadPdf/EFFECT_OF_SETBACK_ON_RC_FRAMED_BUILDINGS_ijariie4564.pdf (Accessed : )
IEEE CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI, "EFFECT OF SETBACK ON RC FRAMED BUILDINGS," International Journal Of Advance Research And Innovative Ideas In Education, vol. 3, no. 2, pp. 3060-3065, Mar-App 2017. [Online]. Available: http://ijariie.com/AdminUploadPdf/EFFECT_OF_SETBACK_ON_RC_FRAMED_BUILDINGS_ijariie4564.pdf [Accessed : ].
Turabian CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. "EFFECT OF SETBACK ON RC FRAMED BUILDINGS." International Journal Of Advance Research And Innovative Ideas In Education [Online]. volume 3 number 2 ().
Vancouver CHETAN KUMAR, Nitin Kumar, T.N. PANDAY, and BHARAT PHULWARI. EFFECT OF SETBACK ON RC FRAMED BUILDINGS. International Journal Of Advance Research And Innovative Ideas In Education [Internet]. 2017 [Cited : ]; 3(2) : 3060-3065. Available from: http://ijariie.com/AdminUploadPdf/EFFECT_OF_SETBACK_ON_RC_FRAMED_BUILDINGS_ijariie4564.pdf
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