Title:
Prestressing Analysis of Large Three-Dimensional Systems and Prestress Management (Open Source)
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.