Effect of Prestressing on Shear Strengths of Cylindrical and Planar Walls with Low Aspect Ratio
Hyeon-Keun Yang and Hong-Gun Park
Appears on pages(s):
cyclic loading; cylindrical wall; delamination zone; posttensioning; shear strength
To investigate the effect of prestressing on the shear strength of
nuclear power plant containment structures, five reinforced or
post-tensioned semi-cylindrical concrete walls and two planar
walls were tested under cyclic lateral loading. The major test
parameters were the presence of unbonded post-tensioning, the
magnitude of horizontal prestressing force, and the use of crossties.
The test results showed that because of the high reinforcement and
prestressing ratio, web-crushing failure occurred in all specimens.
The shear strengths of reinforced concrete (RC) and prestressed
concrete (PSC) walls were greater than the nominal shear strength
specified in the current design/evaluation methods. In the case of
walls subjected to horizontal prestressing force, early delamination
cracking occurred due to radial tensile stress. The delamination
cracking was restrained by the use of crossties. Further, the effect
of prestressing on the web-crushing strength was not significant.
When the diameter of the cylindrical wall was the same as the
length of the planar wall, the peak shear strength of the cylindrical
wall was equivalent to that of the planar wall despite the different