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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
High Normal Low 
T [s] Reso Reso Reso No Resonance 
nance [1] nance [2] | nance [3] 
Story Story Story Story 
0.58 9 8 10 7 6 5 4 1.3 1.24 il 
0.56 8 9 7 10 6 8 3 |-3-1.2 151 
0.54 8 9 7 10 6 5 4.0302} 1 
0.52 7 8 9 6 10 5 4.4:3.1.2 nl 
0.50 7 8 9 6 10 3 4.13 L2 | 4 
0.48 6 7 8 5 9 io 14 13]2. ] 
0.46 6 7 8 5 9 4 10 312]. 
0.44 6 7 5 8 4 i059 3.25 I 
0.42 5 6 8 7 4 10 19 13!/2[| 
0.40 5 6 7 4 8 3 10 | 9 21: 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Table 1. Possibilities of the structures to experience resonance 
depending on the number of their storeys 
6. CONCLUSION 
Analysing the map of Ty, which was drawn up using T; values 
determined for the study area with the applications of SCPT, 
revealed that the fundamental vibration period of the ground 
varied between 0.18 and 0.61. The most striking feature of the 
study area was that the fundamental vibration period of the 
ground decreased towards the northern east and southern east 
parts of the study area through which the Porsuk River flows 
with an east west oriented course. In parts with high elevations, 
the values of T; in the study area varied due to such geological 
features as rock and presence of old alluvium. The fact that the 
To value was as low as 0.20 as a result of 18" and 28" 
applications seems to indicate that the ground is hard in this 
part. 
It is known that, there is an alluvial ground in the SCPT 
application points numbered 6.13,16,22,25.27.30 and 32 
(Ayday, C. et all., 2001). There was an agreement between the 
high values of Ty, varying between 0.40-0.61, and the profile of 
the ground. 
Map of fundamental vibration period suggests that, buildings 
with 5 and 6 storeys constructed on alluvial grounds in the 
study area are likely to experience resonance. Using Chart 1, 
resonance-risk values were determined and mapped in 
consideration of the number of storeys of the buildings and the 
fundamental vibration period of the ground in the study area 
(Figure 9). 
  
Figure 9. Map of resonance-risk values in terms of structure- 
risk of the studied area 
1141 
When the distribution of resonance-risk values according to the 
districts in the study area was analysed, the number of the 
buildings likely to experience resonance was 63, which 
accounts for the 5.4 % of all the buildings investigated. The 
number of the buildings with little risk of resonance was 849, 
which accounts for 73 % of the buildings in the study area 
(Table 2). 
  
Riskl | Risk2 | Risk3 | Risk4 | Toplam 
  
  
  
  
  
Haciseyit 18 14 9 208 249 
Hayriye 1 5 27 122 155 
ihsaniye 9 9 6 144 138 
Hacialibey 15 23 10 150 198 
Cumhuriy 20 55 89 255 419 
e 
Toplam 63 106 141 849 1159 
(%) 5.4 0.1 12.2 73.3 100 
  
  
  
  
  
  
  
  
  
  
Table 2. Distribution of resonance-risk values in the study area 
according to districts 
Buildings with 1,2 and 3 storeys were categorized as the fourth 
group as they were the ones with the least risk. They account 
for 73.3 % of all the buildings in the study area, but they 
accommodate only 25.5 % of the inhabitants residing there. On 
the other hand, buildings with 7, 8 and 9 storeys were 
categorized as the 1 group as they were the ones with the 
highest risk. They account for only 5.4 % of all the buildings in 
the study area, but they accommodate 51.9 % of the inhabitants 
of the study area. Therefore, we suggest that the risk should not 
be determined according to the number of the buildings. On the 
contrary, it should be determined according to the number of 
the storeys of the buildings and the number of the inhabitants 
occupying these buildings (Figure 10). 
  
  
PEKI Rkk2 PEK3 REk 4 
DET 
  
  
  
Figure 10. Percentage values of resonance-risk in the studied 
area