Title: Step-by-step Integration Procedure for Computing State of Stress in Prestressed concrete pipe
Author(s): Mehdi S. Zarghamee and william R. Dana
Publication: Symposium Paper
Appears on pages(s): 155-170
Keywords: concrete pipes; creep properties; prestressed concrete; prestressing steels; prestress loss; shrinkage; strains; stresses; structural analysis; structural design; Design
A step-by-step procedure is used for computing the state of stress in a prestressed concrete cylinder pipe accounting for the effects of creep and shrinkage of concrete core and mortar coating and of wire relaxation. The procedure is applied to an embedded-cylinder pipe subjected to the outdoor environment and to that of a buried pipe with varying humidity conditions. The results show that for pipe exposed to the outdoor environment, the prestress in the inner and the outer cores of embedded-cylinder pipe are significantly different. However, the change in the environment resulting from burial of the pipe and filling it with water reduces the losses, and the difference in the prestress of the inner and the outer core of embedded-cylinder pipe.