PSI - Issue 14

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 14 (2019) 806–819

2nd International Conference on Structural Integrity and Exhibition 2018 Analysis of Irregular Structures under Earthquake Loads Siva Naveen E a,d , Nimmy Mariam Abraham b,d,* , Anitha Kumari S D c,d 2nd International Conference on Structural Integrity and Exhibition 2018 Analysis of Irregular Structures under Earthquake Loads Siva Naveen E a,d , Nimmy Mariam Abraham b,d,* , Anitha Kumari S D c,d a Former Post-graduate Student, b Assistant Professor, c Associate Professor d M. S. Ramaiah University of Applied Sciences, Bangalore, 560058, India a Former Post-graduat Student, b Assistant Professor, c Associate Professor d M. S. Ramaiah University of Applied Sciences, Bangalore, 560058, India

Abstract Behavior of a multi-storey building during strong earthquake motion depends on structural configuration. Irregular configuration either in plan or in elevation is recognized as one of the major causes of failure during earthquakes. Thus irregular structures, especially the ones located in seismic zones are a matter of concern. Structures generally possess combination of irregularities and consideration of a single irregularity may not result in accurate prediction of seismic response. The choice of type, degree and location of irregularities in the design of structures is important as it helps in improving the utility as well as aesthetics of structures. Hence, the present study addresses the seismic response of reinforced concrete structures possessing various combinations of irregularities. A nine-storeyed regular frame is modified by incorporating irregularities in various forms in both plan and elevation to form 34 configurations with single irregularity and 20 cases with combinations of irregularities. Along with the regular configuration, 54 irregular configurations are analyzed and compared. All the frames are subjected to seismic loads and the response of the structures is computed numerically. It is observed that irregularity considerably affects the seismic response. Out of various types of single irregularities analyzed, stiffness irregularity is found to have maximum influence on the response. Among the cases having combinations of irregularities, the configuration with mass, stiffness and vertical geometric irregularities has shown maximum response. The results of this study would aid in designing of irregular structures judiciously without compromising their performance. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Abstract Be avior of a multi-storey building dur ng strong arthquake motion depends on str ctural configuration. Irregular configuration ith r in plan r in elevation i recognized as one of the maj r auses of failure during earthquakes. Thus rregula str ctures, espe ially the ones located in seismic zones are a matter of oncern. Stru tures generally posses combination f irregulariti s c nsideration of a single irregularity may not result in accur te prediction of seismic response. The choice of type, degree and location of irregulariti in the esign of tructure important as it helps in improvi g the utility as well as aesthetics of structures. Hence, the present study addresses the seis ic respons of reinforced concrete structures p ssessing vari us combi ations of irregularities. A nine-s oreyed regular frame is modified by incorporating irregularities in various forms in bo plan and elevation to f rm 3 configu ations with single irregularity and 20 cas s with combinations of irregulari ie . Along with the regular c figuration, 54 irregular nfigurations a e nalyzed and compared. All the frames are subjected to eismic loads and the response of the structures is computed numerically. It is ob erv d that irregularity considerably affects the seismic Out of various types of single irregularities analyzed, stiffn ss irre l rity is found to have maximum influence on the response. Among the cases having combinations of irregularitie , the configuration with mass, stiffness and vertical geometric irregularities has shown maximum response. The results of this study would aid in designing of irregular structures judiciously without compromising their performance. © 2018 The Authors. Published by Elsevier B.V. This is a open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

Keywords: Configuration, horizontal irregularity, vertical irregularity, combination, response, displacement, storey drift Keywords: Configuration, horizontal irregularity, vertical irregularity, combination, response, displacement, storey drift

*Corresponding author. Tel.: +91 9448234542 E-mail address: nimmy555@gmail.com *Corresponding author. Tel.: +91 9448234542 E-mail address: nimmy555@gmail.com

2452-3216© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216© 2018 Th Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.07.059