PSI - Issue 14

Siva Naveen E et al. / Procedia Structural Integrity 14 (2019) 806–819 Siva Naveen E, Nimmy Mariam Abraham, Anitha Kumari S D / Structural Integrity Procedia 00 (2018) 000–000

818

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Table 7 Maximum Base shear and Overturning moment for all the cases analyzed. Model Maximum Base Shear (kN) Maximum Overturning Moment (kNm) Model

Maximum Overturning Moment (kNm)

Maximum Base Shear (kN)

Regular MI-1 MI-2 MI-3 MI-4 SI-1 SI-2 SI-3 SI-4 SI-5 SI-6 SI-7 SI-8 SI-9 SI-10 VGI-1 VGI-2 VGI-3 VGI-4 VGI-5 VGI-6 VGI-7 VGI-8 VGI-9 VGI-10 REC-1 REC-2 REC-3

237.6 279.4 243.8 371.1 295.3 301.8 251.6 242.1 304.0 246.1 248.2 236.6 190.1 225.5 268.7 181.0 184.7 82.7 212.2 145.6 157.3 110.3 147.8 140.4 136

318.9 366.4 309.7 501.3 390.9 401.1 351.9 415.5 445.8 337.6 334.3 320.5 273.3 315.2 360.7 207.4 204.3 100.5 208.7 308.5 214.2 166.5 172.2 161.6 157.1

REC-4 REC-5 REC-6 REC-7

211.44 172.04 141.89 150.00 202.41 152.27 207.46 272.1 286.8 140.9 190.3 140.7 146.9 160.0 149.0 124.4 176.2 127.5 86.0 151.7 126.2 150.0 178.6 182.5 100.8 152.7 140.7

285.84 245.02 189.71 207.06 264.57 226.19 315.70 395.3 470.1 228.4 256.7 207.0 264.0 274.7 274.7 209.0 264.7 214.6 84.1 183.0 176.7 182.2 269.8 240.3 130.0 237.3 210.7

TI-1 TI-2 TI-3 C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 C-9 C-10 C-11 C-12 C-13 C-14 C-15 C-16 C-17 C-18 C-19 C-20

137.043 180.83 122.165

178.27 244.05 177.11

6. Conclusions The structural behaviour of multi-storey frames with single and combinations of irregularities is studied. The results indicate that irregularity considerably affects the structural response. In all the cases analysed, change in response is observed for frames having single or multiple irregularities with respect to the regular configuration. The present study indicates that the presence of irregularities does not always amplify the response. Certain combinations of irregularities bring down the structural response. All the single irregularity cases analysed have shown an increase in response when compared to the regular configuration under seismic loads. Among these cases, the configurations with vertical geometric irregularity have given maximum response. The combination of stiffness and vertical geometric irregularities has shown maximum displacement response whereas the combination of re entrant corner and vertical geometric irregularities has shown less displacement response. In the modern world, where people are not ready to compromise with their needs, incorporation of combinations of irregularity in structures is inevitable. As the structural response depends on the type, location and degree of irregularity, these factors need to be taken care while designing any structure. This would help in incorporating irregularities in structures without compromising their performance. Acknowledgements The authors would like to extend their gratitude to M.S.Ramaiah University of Applied Sciences for providing all the facilities for conducting the research work. Sincere thanks to Computers and Structures, Inc. for permitting the authors to use the finite element software, ETABS for research purpose.