Experimental Investigation of Shear Dominant RC Beam Repaired with DFRCC at Cover Thickness

Title: Experimental Investigation of Shear Dominant RC Beam Repaired with DFRCC at Cover Thickness
Author(s): Jang-Ho Jay Kim, Yun Mook Lim, Jong-Pil Kim
Paper category : conference
Book title: International RILEM Workshop on High Performance Fiber Reinforced Cementitious Composites in Structural Applications
Editor(s): G. Fischer and V. C. Li
Print-ISBN: 2-912143-93-4
e-ISBN: 2912143942
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 411 - 419
Total Pages: 9
Nb references: 9
Language: English

Abstract: Recently, many shear dominant structural members in existing concrete structures have been evaluated as below serviceable standard requiring strengthening and/or repair. In order to properly evaluate and repair aged reinforced concrete (RC) structures, three levels of classification (i.e., low, intermediate, and sever levels of damage) based on aging severity have been proposed. For sever-level damaged RC structures, section replacement methods of removal and replacement of old concrete and/or steel reinforcements of damaged sections with new concrete and/or steel reinforcements are commonly used. However, these simple repairing methods cannot account for complicated structural behaviors such as shear behavior of RC structures. Also, these methods have focused only on using repairing materials such as normal or high strength concrete for repairing aged RC structures. To complement the disadvantages of cement-based construction materials such as brittleness of failure, Ductile Fiber Reinforced Cementitious Composite (DFRCC), a high performance cementitious composite with superior strain capacity is currently being used to repair old infrastructures. However, the interface between old substrate and new repair material is the weakest part in the repaired system where most failures occur. This interface failure is usually related to shear stress concentration occurring at the interface. The objective of this study is to accurately understand the shear behavior of DFRCC repaired RC beams. In this study, RC beams without stirrups are repaired using DFRCC for the cover thickness and twice the cover thickness at the bottom tension section to understand the repairing effect of DFRCC on RC beam under shear stress inducing bending load. Moreover, a control beam specimen which is not repaired with DFRCC is tested for comparison. Using a four-point bending test, the shear strengths and shear stress-deflection relations of DFRCC repaired RC specimens are obtained. The results are discussed in detail.

Online publication: 2005-05-15
Classification: Seismic Design, Shear and Torsion
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143942.045