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Seismic Pounding Effect in Framed Structures
N. N. Gulhane1, Prof. M. V. Mohod2
1
2
Post graduate student in structural engineering,
Department of Civil engineering, Prof. Ram Meghe Institute of Technology and Research Badnera, Sant Gadge
Baba Amravati University, Amravati, Maharashtra 444602 India
ABSTRACT: Pounding between adjacent structures is commonly observed phenomenon during
major earthquakes which may cause both architectural and structural damages. To satisfy the
functional requirements, the adjacent buildings are constructed with equal and unequal heights, which
may cause great damage to structures during earthquakes. To mitigate the amount of damage from
pounding, the most simplest and effective way is to provide minimum separation distance.
To study the effect of structural pounding, a case study has been done on different setback ratios (Area
& Height) and to investigate the minimum seismic pounding gap between two adjacent structures by
using GAP joint element & non- linear time history analysis.
Keywords: SAP v.14, setback structures, Seismic analysis, gap element
I. INTRODUCTION
Structures are built very close to each other in metropolitan areas where the cost of land is very high.
Due to closeness of the structures, they collide with each other when subjected to earthquake or any vibration.
This collision of buildings or different parts of the building during any vibration is called pounding which may
cause either architectural and structural damage or collapse of the whole structure. This may happen not only in
buildings but also in bridges and towers which are constructed close to each other. Although some modern codes
have included seismic separation requirement for adjacent structures, large areas of cities in seismically active
regions were built before such requirements were introduced. Many investigations have been carried out on
pounding damage caused by previous earthquakes. Pounding damage was observed during the 1985 Mexico
earthquake, the 1988 Sequenay earthquake in Canada, the 1992 Cairo earthquake, the 1994 Northridge
earthquake, the 1995 Kobe earthquake and 1999 Kocaeli earthquake. Significant pounding was observed at sites
over 90 km from the epicentre thus indicating the possible catastrophic damage that may occur during future
earthquakes having closer epicentres.
II. BUILDING MODELING
For this study 21 story building with a 3m height of each story, Different building geometries Area &
Height were taken for the study. These building geometries represent varying degree of irregularity. In 2 D
frame structure nine different categories of buildings, ranging 4 bays (in X direction) a bay width 4m and 21
bays in Y direction. In SAP 14 software. three different gap element are provided in building.
Sr. no.
1
2
3
4
5
6
Sr. no.
1
2
3
TABLE 1
Description
Number of stories
Building height
Bay width in x- direction
Size of beam
Size of column
Grade of concrete & steel
Along plan area (RA)
RA=25
RA=50
RA=75
| IJMER | ISSN: 2249–6645 |
Specification
G+20
63m
4m
0.45mx0.45m
0.45mx0.60m
M20 & Fe415
TABLE 2
Along height (RH)
RH=16/5, 11/10, 6/15
RH=16/5, 11/10, 6/15
RH=16/5, 11/10, 6/15
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Gap width (m)
0.05, 0.10, 0.15
0.05, 0.10, 0.15
0.05, 0.10, 0.15
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2. Seismic Pounding Effect in Framed Structures
Figure:1 Irregularities In Height i.e. RA=25 and RH=16/5,11/10,6/15
Figure:2 Irregularities In Height i.e. RA=50 and RH=16/5,11/10,6/15
Figure:3 Irregularities In Height i.e. RA=75 and RH=16/5,11/10,6/15
| IJMER | ISSN: 2249–6645 |
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3. Seismic Pounding Effect in Framed Structures
III. RESULTS AND DISCUSSION
For showing variation spectral displacement varies gap width
0.000475
0.000474
RA-25 & RH-16/5
0.000473
0.000472
0.000471
RA-25 & RH-16/5
0.00047
0.000469
0.000468
5
10
15
Figure:4 RA=25 and RH=16/5 for gap= 0.05m, 0.10m, 0.15m
RA-25 & RH-11/10
0.00117
0.001168
0.001166
0.001164
0.001162
0.00116
0.001158
0.001156
0.001154
0.001152
RA-25 & RH-11/10
5
10
15
Figure:5 RA=25 and RH=11/10 for gap= 0.05m, 0.10m, 0.15m
RA-25 & RH-6/15
0.00166
0.001655
0.00165
0.001645
0.00164
0.001635
0.00163
0.001625
0.00162
RA-25 & RH-6/15
5
10
15
Figure:6 RA=25 and RH=6/15 for gap= 0.05m, 0.10m, 0.15m
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4. Seismic Pounding Effect in Framed Structures
0.000489
RA-50 & RH-16/5
0.000488
0.000487
0.000486
0.000485
RA-50 & RH-16/5
0.000484
0.000483
0.000482
5
10
15
Figure:7 RA=50 and RH=16/5 for gap= 0.05m, 0.10m, 0.15m
RA-50 & RH-11/10
0.00134
0.001335
0.00133
0.001325
0.00132
0.001315
RA-50 & RH-11/10
0.00131
0.001305
0.0013
5
10
15
Figure:8 RA=50 and RH=11/10 for gap= 0.05m, 0.10m, 0.15m
RA-50& RH-6/15
0.00134
0.001335
0.00133
0.001325
RA-50& RH-6/15
0.00132
0.001315
5
10
15
Figure:9 RA=50 and RH=6/15 for gap= 0.05m, 0.10m, 0.15m
| IJMER | ISSN: 2249–6645 |
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5. Seismic Pounding Effect in Framed Structures
RA-75 & RH-16/5
0.000516
0.000514
0.000512
0.00051
0.000508
0.000506
RA-75 & RH-16/5
0.000504
0.000502
0.0005
0.000498
5
10
15
Figure:10 RA=75 and RH=16/5 for gap= 0.05m, 0.10m, 0.15m
RA-75 & RH-11/10
0.002332
0.00233
0.002328
0.002326
0.002324
0.002322
RA-75 & RH-11/10
0.00232
0.002318
0.002316
5
10
15
Figure:11 RA=75 and RH=11/10 for gap= 0.05m, 0.10m, 0.15m
RA-75 & RH-6/15
0.00146
0.001455
0.00145
0.001445
RA-75 & RH-6/15
0.00144
0.001435
0.00143
5
10
15
Figure:12 RA=75 and RH=6/15 for gap= 0.05m, 0.10m, 0.15m
| IJMER | ISSN: 2249–6645 |
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6. Seismic Pounding Effect in Framed Structures
Time history results clearly depict the need of seismic gap between adjoining structures. The initial models
of RA=25%, RA=75% variation along the height shows the need of seismic gap between the range 5cm to 15cm.
whereas for RA=50% and variation along height a seismic gap between 5cm to 10cm is suggested.
IV. CONCLUSIONS
The analytical studies involved design of different building geometries were taken for the study .the
building geometries represent varying degree of irregularity or amount of setback.
Following conclusion can be draw from the obtaining result,
1) when RA=25,75 and RH=16/5,11/10 in that case response linearly increases then seismic gap width 15 cm have
found to be sufficient. RA=25, 75 and RH=6/15 in that case seismic gap width more than 15 cm is needed.
2) RA=50 and RH=16/5,11/10 is show similar variation in seismic gap width 15 cm have found to be sufficient. But
for RA=50 and RH=6/15 the seismic gap width 10 cm is sufficient.
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| IJMER | ISSN: 2249–6645 |
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| Vol. 4 | Iss. 1 | Jan. 2014 |216|