|Table of Contents|

Effect of Releasing Pretension for Steel Beams Bonded with Prestressed Carbon Fiber Sheet(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2010年04期
Page:
14-18
Research Field:
Publishing date:
2010-12-20

Info

Title:
Effect of Releasing Pretension for Steel Beams Bonded with Prestressed Carbon Fiber Sheet
Author(s):
ZHOU Chao-yang;  HUANG Lin;  HE Xue-jun
School of Civil Engineering and Architecture, Central South University, Changsha 410075, Hunan, China
Keywords:
flexural member;  strengthening;  prestress;  carbon fiber sheet;  effect of releasing pretension;  camber deflection
PACS:
TU375.1
DOI:
-
Abstract:
The effect of releasing pretension was investigated for flexural members externally bonded with prestressed laminate. Based on the assumption of linear elastic physical relationship and the compatibility of deformation, the equations of distribution were derived for stresses of laminate, respectively on interface and at cross sections of a beam. The calculation formulae were obtained for effective prestress and prestress loss. The calculation formulas of camber deflection were deduced by adopting the method of conjugate beam. A set of easy prestressing devices was developed to exert pretension to carbon fiber sheet. The prestressed strip was mechanically anchored at both ends and then bonded to a steel beam with I-shaped section. After the adhesive dried the mechanical anchor was loosed, the effect of releasing pretension was measured. Analysis results show that the test results agree well with the calculated results, and the rationality and correctness of the theoretical expressions are verified. This will serve as the foundation for the further development of strengthening technology with prestressed carbon fiber sheet and establishment of the related design theory.

References:

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Last Update: 2010-12-20