Title:
Reliability of Proposed Three-Dimensional Finite Element Method Prestressing Analysis (Open Source)
Author(s):
Yasuaki Ishikawa, Tomoki Ito, and Satoshi Hayakawa
Publication:
Structural Journal
Volume:
122
Issue:
2
Appears on pages(s):
37-48
Keywords:
free-body force balance; frictional force; pseudo-centripetal force; pulled-out prestressed concrete (PC) steel length
DOI:
10.14359/51744393
Date:
3/1/2025
Abstract:
This paper examines the inaccuracy of the initial strain method that is generally adopted in three-dimensional (3-D) finite element prestressing analysis and discusses the merits of a newly
developed method to calculate 3-D prestressing effects. The new method considers friction loss of the tendon force as well as pseudo-
centripetal forces, allowing a wide range of functional forms for the prestressed concrete (PC) steel force distribution assumption. This study examined the basic concepts for adopting the functional form of the PC steel force distribution at the prestressing and seating stages, after which the observed and calculated values of pulled-out lengths of PC steel were compared to assure the credibility of the assumed functional form of the PC steel force distribution. A three-span continuous bridge model was used to compare results obtained by the conventional method and the new 3-D method. The equilibrium of a free body was used also to evaluate the accuracy of results by the new method. The importance of the new method being able to calculate a pulled-out PC steel length considering concrete deformation was stressed because this value may be adopted to confirm assumptions of the PC steel force distribution.