fi 
  
— À SEC ENS 
200 
1.00 
0.00 
deformations 
-200 -100 
  
Fig.4. Axonometric view of shell deformation in development. 
surface is completely smooth, gunited or painted, or 
in case of investigation of deformation alterations 
in time. Determination precision of geometric 
imperfection alteration in nodes of finite element 
net , on the base of external surface numerical 
models, curried out in comparable measurement cycles, 
can be too small as necessary for univocal evaluation 
of cooling tower shell stability and strength. 
4. CONCLUSION 
Choice of one of photogrammetric methods for 
investigations of real shape of hyperbolic cooling 
tower external surface depends before all on 
signalling and identification possibilities of 
observation and control points on the cooling tower 
surface. In case of existence of such possibilities, 
the more suitable method is the stereophotogrammetric 
one, which also has more possibilities of easy 
further processing by means of existing computer 
graphic programs. 
In case of cooling towers without possibility of 
signalling of observation points and control points, 
and also in investigations of shell deformation 
alterations, more suitable can prove the 
monophotogrammetric method. The final choice of the 
method depend also on possession of photogrammetric 
devices and on possibility of photogrammetric devices 
and on possibility of control over adequate 
computational and graphical programs which permit to 
determine required values necessary to evaluate 
stability and strength of cooling tower. 
5. LITERATURE 
Chauvel, D., Bozett, P., Balvin, M., 1990. Long Term 
Development of Cooling Tower Shells Backed by EDF. 7. 
Symp. IAHR, Leningrad. 
Golczyk, M., 1989. Technical Analysis of Causes and 
Consequences of Damages and Collapses of Hyperbolic 
Cooling. Tower Shells. Conference on "Durability 
Problems of Reinforced Concrete Cooling Towers". 
Wrocl aw-Castle Czocha. 
Katowski, 0.,1990. Instruments and Systems for the 
332 
Surveillance of Man-Made Structures and Areas Subject 
to Geophysical Movement. Civil Engineering Surveyor, 
pp. 23-23. 
Mierzwa, W., 1991. Photogrammetric Determination of 
the Cooling Tower Shape Using for Results 
Presentation Computer Graphic Software. Symp. Cooling 
Towers-Effective Systems of Protection and Repair, 
Jelenia Góra. 
Owczarzy, J., 1991. Geometric Imperfections of 
Hyperbolic Cooling Tower Shells. Symp. Cooling 
Towers-Effective Systems of Protection and Repair, 
Jelenia Géra, pp.77-82. 
Owczarzy, J., 1989. Collapses of Reinforced Concrete 
Hyperbolic Cooling Towers. Conference on "Durability 
Problems of Reinforced Concrete Cooling Towers”. 
Wroclaw-Castle Czocha, pp.101-108. 
Report of the Committee of Inquiry into Collapse of 
Cooling Towers at Ferrybridge. Central Electricity 
Generating Board, 1966. 
Wozniak J., 1988. Determining Deformation of Cooling 
Tower Surface. Congress ISPRS, Kyoto.