Wedge-Type Expansion Anchors in High-Performance Concrete

Since the mechanical properties between ordinary and high-performance concrete (HPC) differ greatly, the performance of an anchor in each type of concrete will differ as well. This paper reports on experiments that were performed to evaluate the mechanical response of torque-controlled expansion anchors embedded in HPC, subjected to tensile loads. The variables include compressive strength of the concrete, addition of steel fibers, and embedment length of the anchors. The embedment length influences the results in terms of both strength and ductility, while fibers strongly affect only the post-peak behavior and the failure pattern. By reducing the embedment length, a reduction in the ultimate load and a more brittle behavior was observed. The specimens without fibers also exhibited a more brittle behavior. Fibers also had a strong influence on the cracking pattern and on the size of the concrete cone. A comparison between the results of HPC and normal-strength concrete and the pullout load given by the manufacturer shows that HPC leads to an increase of the strength. A comparison between standard design equations and experimental results is provided in order to suggest some proposals for the extension of the model prediction on normal-strength concrete to HPC. Future research is needed to suggest reliable relationships to be used in HPC and for different anchor types.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01046582
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 17 2007 10:22PM