Title: Prestressing Analysis of Large Three-Dimensional Systems and Prestress Management

Author(s): Hiroshi Nishio, Yosuke Yagi, and Yasuaki Ishikawa

Publication: Structural Journal

Volume: 121

Issue: 5

Appears on pages(s): 109-122

Keywords: friction loss; large-scale prestressed concrete (PC) structure; prestressing analysis; prestressing management; set loss; three-dimensional (3-D) finite element method (FEM) analysis

DOI: 10.14359/51740857

Date: 9/1/2024

Abstract:
A three-dimensional (3-D) finite element method for prestressing and seating analysis has been developed. This method improves the accuracy of the results obtained using the widely adopted initial stress method and enables calculation of the seating loss effect, which is the final stress prediction of prestressing. Its application for large numbers of indeterminate-order structures is shown by comparing its calculation results with two-dimensional (2-D) conventional analysis, as well as with observed strain results for cables of an existing 462 m, six-span continuous bridge. With these considerations, a new management method of prestressing for jack force-diverting systems where the prestressing force does not focus uniquely on a design section was developed so that constructed prestressed concrete structures can be well-secured to comply with design objectives.