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

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Table 3. Percentage reduction in storey stiffness for the configurations having SI.

% of storey stiffness with respect to adjacent storey

% Reduction in storey stiffness with respect to adjacent storey

Location of irregularity

Case

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

1 st floor 1 st floor 8 th floor 5 th floor 5 th floor 3 rd floor 3 rd floor 3 rd floor 5 th floor 5 th floor

57

43

12.5 12.5

87.5 87.5

28 61 70 52

72 39 30 48

67.5

32.5

57 16

43 84

SI-10

4.2. Configurations having Combinations of Irregularities Twenty cases with seven different combinations of irregularities (CoI) are considered for the analysis. The details of various combinations considered are tabulated in Table 4. The individual cases of irregularities where maximum response is observed are selected for the analysis of frames having combination of irregularities. Location and type of irregularity are kept almost same for the cases in each CoI. Figure 2 depicts the different combinations of irregularities considered for the analysis.

Table 4. Details of the cases with combination of different irregularities.

Combination case number

Combination case number

CoI

Irregularity involved

CoI

Irregularity involved

CoI-1 CoI-1 CoI-2 CoI-2 CoI-2 CoI-3 CoI-3 CoI-3 CoI-4 CoI-4

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

MI+SI MI+SI

CoI-4 CoI-5 CoI-5 CoI-5 CoI-6 CoI-6 CoI-6 CoI-7 CoI-7 CoI-7

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

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

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