Influence of the Curvature on the Bond Force Transfer of EBR

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Title: Influence of the Curvature on the Bond Force Transfer of EBR

Author(s): Wolfgang Finckh and Konrad Zilch

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: Strengthening, Externally bonded reinforcement, CFRP, Bond, Intermediate debonding, Flexural strengthening, Design model

Date: 3/1/2011

Abstract:
When RC is strengthened by using externally bonded reinforcement (EBR) it is not sufficient to perform checks just for the end anchorages. The bond forces must be transferred where the load is applied. These bond forces may be transferred by the elements in between flexural cracks which are mainly influenced by the bond behavior of the internal and external reinforcement. Therefore the models which were derived from end anchorage tests must be expanded to include other effects as well. The here considered laboratory tests had shown that aside from the bond friction a self-induced contact pres-sure on the strip occurs as a result from the element's curving under load. This article presents a model for bond force transfer which includes the increased bond strength resulting from the positive curvature of structural elements. By considering the curvature for the bond force transfer strengthened elements can be design in a more economic and safe way.