Download Effect of Diaphragm Discontinuity on Seismic Response

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International Journal of Emerging Technology and Advanced Engineering
Time period in seconds
Website: www.ijetae.com (ISSN 2250-2459, ISO 9001:2008 Certified Journal, Volume 5, Issue 12, December 2015)
Frequency is the reciprocal of time period. The
frequency for various modes for the six considered models
are given in table above. Frequency is directly proportional
to stiffness of the building. More the frequency stiff is the
building.
2
type
1
type
2
type
3
type
4
1.5
1
0.5
0
0
1
2
3
Base Shear
Table 3
Base Shear comparisons for the six considered G+7 storey models
4
Type
EQX
EQY
WIND X
WIND Y
1
-2843.78
-1444.88
-1375.93
-1031.95
2
-3037.39
-1492.44
-1379.67
-1034.76
3
-2826.78
-1509.37
-1375.93
-1034.76
4
-3085.56
-1539.44
-1379.67
-1034.76
5
-2901.93
-1459.2
-1379.67
-1034.76
6
-2952.05
-1473.88
-1375.93
-1029.15
Mode Shape
Fig 9 Time Period comparison for the six considered G+7 storey
models
It is observed that the time period of Type 5 is more as
compared to other models in 1st mode , in 2nd mode time
period of Type 1 is more and time period of Type 3 is more
in 3rd mode as compared to other models. The behaviour of
building is better when diaphragm discontinuity is closer to
the Centre of the building.
Frequency
Table 2
Shows Frequency comparison of three modes for the six considered
G+7 storey models
Mode
Type 1
Type 2
Type 3
Type 4
Type 5
Type 6
1
0.586
0.587
0.597
0.590
0.560
0.580
2
1.058
1.070
1.096
1.077
1.114
1.090
3
1.152
1.196
1.112
1.181
1.21
1.162
Frequency
1.5
Fig 11 Base Shear comparison for the six considered G+7 storey
models when considered earthquake
Type 1
Type 2
1
Type 3
Type 4
0.5
Type 5
Type 6
0
1
2
Mode
3
Fig 10 Frequency comparison for the six considered G+7 storey
models
Fig 12 Base Shear comparison for the six considered G+7 storey
models when considered wind
133
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