Appendix B 

 THIN-WALLED CYLINDER TESTS 



SCOPE 



A total of 15 unreinforced concrete cylinder specimens were tested 

 under hydrostatic loading. The dimensions of the specimens were a 

 constant outside diameter, D , of 54 inches (1372 mm), overall length of 

 134 inches (3400 mm), and wall thicknesses, t, of 1.31, 1.97, or 3.39 

 inches (33, 50, or 86 mm). The wall-thickness-to-outside-diameter, 

 t/D^, ratios were 0.024, 0.037, and 0.063, respectively. Two different 

 types of boundary conditions were used: a simply supported and a 

 free end-condition. Twelve of the specimens were tested under short- 

 term hydrostatic loading where the pressure was increased until implo- 

 sion; the remaining three specimens were subjected to long-term load- 

 ing. 



Structural behavior was recorded by measuring radial displace- 

 ments around the entire circumference of the cylinder wall at various 

 locations along the length. Deflected cross-sectional shapes were plot- 

 ted from which the following data could be determined: 



(a) Initial deviations from circularity 



(b) Radial displacements due to membrane shell action and 

 bending 



39 



