|
Title |
Improvement Measures for the Elongation Management Techniques of Tendons in Post-tensioned Structures
|
|
DOI |
https://doi.org/10.4334/JKCI.2025.37.6.797 |
|
Keywords |
프리스트레스트 콘크리트; 포스트텐션; 신장량; 긴장재; 마찰계수 prestressed concrete; post-tension; elongation; prestressing tendon; friction coefficient |
|
Abstract |
During the construction of prestressed concrete (PSC) structures, the management of tendon elongation during the tensioning of prestressing tendon is a critical factor to ensure that the PSC structure behaves as predicted in the design, including aspects such as camber and concrete stress distribution. For accurate elongation calculations, a variety of data must be considered without error, and in particular, the friction coefficients must be reasonably assumed. One of the key purposes of elongation management is to verify whether the assumed friction coefficients in the design are also valid in the field and to take corrective measures if necessary. However, in practice, there are frequent cases where the focus is limited to meeting the allowable elongation by arbitrarily adjusting friction coefficients, neglecting the validity of the calculations and the fundamental purpose of elongation management. This study discusses common errors and approximation-related discrepancies in elongation calculation during tensioning plans, and proposes improvement measures. Through example cases, it also aimed to comparatively examine the impact of such calculation errors and approximations.
|