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

817

12

configurations, owing to the increase in mass of the structure. On other hand, due to the reduction in overall mass of the structure, VGI and REC cases have shown lesser base shear and overturning moment than that of regular, MI and SI cases. Among the cases with combination of irregularities, C-2 (MI+SI) has shown maximum base shear and overturning moment. C-18 (MI+SI+VGI+REC+TI) has displayed the least base shear and overturning moment owing to the overall reduction in both mass and stiffness. In short, the case with increased mass (MI-2) has shown maximum base shear and overturning moment among all the irregularity cases analysed.

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9

Level

Level

0

10

20

30

40

0

5

10

15

Displacement(mm)

Storey Drift(mm)

R

C-12 C-16 C-20

C-13 C-17

C-14 C-18

R

C-12

C-13

C-14

C-15

C-15 C-19

C-16

C-17

C-18

C-19

C-20

Fig.7. Displacement and Storey drift of CoI cases (C12-C20).

Table 5 Maximum percentage increase in displacement response for single irregularity cases Case % change in maximum displacement with respect to regular configuration MI-3 38 SI-10 101 VGI-6 133 REC-6 5 TI 6

Table 6 Percentage change in displacement response for combination cases

% change in maximum displacement with respect to regular configuration

% change in maximum displacement with respect to regular configuration

Combination case number

Irregularity involved

Combination case number

Irregularity involved

C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 C-9

MI+SI MI+SI

97 48

C-11 C-12 C-13 C-14 C-15 C-16 C-17 C-18 C-19 C-20

MI+SI+VGI REC+VGI REC+VGI REC+VGI

242 -50 -32 -10 54 -68 25 50 68 109

MI+VGI MI+VGI MI+VGI SI+VGI SI+VGI SI+VGI

146

10

125 249 105 250 238 104

MI+SI+REC+VGI MI+SI+REC+VGI MI+SI+REC+VGI MI+SI+REC+VGI+TI MI+SI+REC+VGI+TI MI+SI+REC+VGI+TI

MI+SI+VGI MI+SI+VGI

C-10