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

815

10

model. The displacement response is reduced by 10% because of the increase in stiffness due to the presence of shear walls. The increase in stiffness induces torsion in the frames.

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9

Level

Level

0

5

10

15

0

0.5

1

1.5

2

Displacement(mm)

Storey Drift(mm)

R

REC-1 REC-4 REC-7

REC-2 REC-5

R

REC-1 REC-4 REC-7

REC-2 REC-5

REC-3 REC-6

REC-3 REC-6

TI-1

TI-1

TI-2

TI-3

TI-2

TI-3

Fig.5. Displacement and Storey drift for REC & TI cases.

Figure 6 represents the displacement response and storey drift for CoI-1 to CoI-4 which includes cases from C-1 to C-11. All these combination cases have shown higher displacement and storey drift compared to the regular model. The maximum drift is observed at the location of irregularity. For C-1, MI is introduced at 2 nd and 7 th storey levels and SI at the first floor. The displacement response is increased by 78% than the regular model. Due to the presence of SI at the first floor, the displacement of first storey is higher than that of C-2. For C-2, MI is positioned at 4 th floor and SI at 5 th floor. The displacement response is found to increase by 54% than that of regular model. Due to the presence of SI at the 5 th floor, there is an abrupt increase in the displacement response from 4 th to 5 th floor. For C-1, due to the presence of SI at the first floor, the drift has shown maximum value of 12.102 mm at that particular floor and it is seen to exceed the drift limits specified in IS 1893:2016 (Part-1). For C-2, the maximum drift occurred at the 5 th storey due to the presence of SI at that particular floor. Out of the three cases of CoI-2, C-5 has shown maximum displacement response. The increase in the displacement response with respect to regular one is 85%. The increased response for CoI-3 is due to the presence of stiffness irregularity at the first floor. Out of the three cases of CoI-3, C-6 has displayed maximum displacement response and the increase with respect to regular model is 150%. Due to the presence of SI at the first floor, the drift is maximum at the first storey level. Out of the three cases, C-8 has displayed maximum storey drift. Due to the presence of stiffness irregularity at the first floor, all the three cases of CoI-4 showed higher displacement response than the regular. The percentage increase with respect to regular model for C-9, C-10 and C-11 are 187, 188 and 188 respectively. Due to the presence of SI at the first floor, the drift is maximum at the first storey level. All the three cases show high storey drift and exceed the limits specified as per IS 1893:2016 (Part-1). Figure 7 shows the displacement and storey drift of 5 th and 6 th CoI, (C-12 to C-20). It is observed that all the three cases of CoI-5 have shown less displacement and drift than that of regular model due to the reduced mass and stiffness. Out of the three cases, C-12 has lesser displacement response and the percentage reduction is 50 with