Title:
Prestressing Circular Tanks
Author(s):
Amin GhaliI and Eleanor Elliott
Publication:
Structural Journal
Volume:
88
Issue:
6
Appears on pages(s):
721-729
Keywords:
circular prestressing; prestressed concrete; prestressing steels; structural design; tanks (containers); walls; Structural Research
DOI:
10.14359/1263
Date:
11/1/1992
Abstract:
Trapezoidal distribution of circumferential prestressing on walls that are free to slide on the base has been conventionally used in the design of circular cylindrical concrete tanks. The prestressing is intended to provide a hoop compressive force sufficient to eliminate the hoop tension due to liquid pressure and maintain a small residual compression of constant intensity over the wall height when the tank is full. Unless the walls are free to slide radially at the top and bottom edges, the trapezoidal prestress distribution produces large, undesirable bending moments in the vertical direction. An improved prestress distribution is derived to reduce substantially the vertical bending moments when the top and bottom edges are restrained. Thus, the need to provide sliding joints can be eliminated or reduced.