7 minute read
Second Nil 5 5 5
B. Maximum Storey Displacement AND Storey Drift At Setbacks
Maximum Storey Displacemnt (mm)
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TH-X
376.00 376.00
367.93 356.14
334.73334.73
TH-Y
349.52 345.18 344.43349.44
Model 0 Model 1 Model 2 Modle 3 Model 4
Fig 11: Maximum storey Displacement
Storey Drift for TH-X
Model 0 Model 1 Model 2 Model 3 Model 4
0.0045 0.0042
0.0030 0.0041 0.0040 0.0038 0.0037 0.0044 0.0042 0.0039
0.00160.0017 0.00160.0016 0.0016
Storey Drift for TH-Y
Model 0 Model 1 Model 2 Model 3 Model 4
0.0045 0.0042
0.0030 0.0041 0.00420.0037
0.00210.0021
0.00380.0036 0.00340.0036 0.0016
0.00160.0016
First Setback Second Setback Top Storey
First Setback
Fig 12: Storey Drift for TH-X and TH-Y
Second Setback Top Storey
C. Overturning Moments/Base Moment
Overturning Moment
m) Overturning Moment (kN 300000 250000 200000 150000 100000 50000 0
252003
214767
107784 107102 107303 107469 75463
71348 75175 72716
TH-X TH-Y
Fig 13: Overturning Moment Model 0 Model 1 Model 2
Modle 3 Model 4
D. Storey Shear at Setbacks
Storey Shear for TH-X Storey Shear for TH-Y
- Grou nd 4436.65 G+6 3397.67 Top
Top TopG+1 3 -1828.46 G+2 0
- Top 249.47
5545.95
4098.47
2407.29
367.70
Storey Shear in kN
Fig 14: Storey shear for TH-X Fig 15: Storey shear for TH-X
IV. CONCLUSIONS
In this Thesis on different setback position on same plan area and same set back heights when compared with regular symmetric building analyzed in ETABSv.16 following conclusions were made:
A. Symmetric building with setback i.e. Model 1 shows minimum value of storey displacement for earthquake forces in both the directions while on comparing asymmetric setback building Model 3 and Model 4 shows lowest value for Y-direction and Xdirection respectively. B. In Irregular setback building, all the structures shows almost equal value at first setback, while at second setback and top storey
Model 1 shows lowest value. Although the difference is small, highest value observed in Model 2 and Model 3 for second setback and top storey respectively. C. In terms of Storey Drift Model 2 and Model 4 shows minimum values as compared to other Models. Although the difference is very small. D. Model 2 and Model 1 shows minimum overturning moments with respect to all other models. E. From here it can concluded that Model 1 i.e. symmetric building with setbacks outperformed all other asymmetric setback building. F. When it is not possible to provide Model 1 like structure than Model 2 is the most preferable than other type asymmetric models. Grou
G+1 G+2 nd G+6
3
0 Top
Top
Top
Top -5000.00 0.00 5000.0010000.00
Storey Shear in kN
Model 4 Model 3 Model 2
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