Some aspects of closed-loop controlled testing of reinforced concrete beams at high rates

S. M. Kulkarni, S. P. Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This paper discusses important issues relevant to high-rate closed-loop testing of reinforced concrete beams. To obtain a high rate of loading from a closed-loop machine, special considerations are required in the design as well as operation of the machine. These issues arc discussed briefly. Useful insight into behavior of a specimen in a high-rate closed-loop test is provided by some analytical expressions supplied here for single degree of freedom (SDOF) and multiple degree of freedom (MDOF) specimen systems. Advantages of displacement control over load control arc apparent from the expressions obtained. Preliminary results of displacement controlled tests conducted on reinforced concrete beams at low and high rates are reported. The specimen deformation versus Lime curve in these tests indicates that for this setup, the test machine used in this project can apply an essentially constant velocity. Crack pattern obtained for the beams as well as inspection of load and specimen deformation signals indicates that the manner of loading was quasi-static (that is, free of inertial effects) even for the high-rate case. The load-deflection curve for the high-rate case exhibits a down-sloping portion after a small plateau.

Original languageEnglish (US)
Title of host publicationNew Experimental Techniques for Evaluating Concrete Material and Structural Performance
EditorsDavid J. Stevens, Mohsen A. Issa
PublisherAmerican Concrete Institute
Pages123-143
Number of pages21
ISBN (Electronic)9780870316425
StatePublished - May 1 1994

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-143
ISSN (Print)0193-2527

Keywords

  • Beams (supports)
  • Ductility
  • Dynamic loads
  • Dynamic tests
  • Earthquake resistant stuctures
  • Flexural strength
  • Hydraulic structures
  • Models
  • Reinforced concrete
  • Shear strength
  • Strains
  • Tests

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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