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Response of a “Plastic hinge” to low-cycle alternating deflections

Authors describe an experimental technique for obtaining a response on which the deflection range is prescribed. This response is expressed in terms of nonlinear moment-curvature relationships

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Abstract

The paper describes an experimental technique for obtaining the response of a “plastic hinge” to low-cycle alternating loads in which a deflection (strain) range is prescribed. The cycle of loading is confined to equal amplitudes of positive and negative curvature. This response is expressed in terms of a nonlinear moment-curvature relationship which may subsequently be employed in “pseudo-static” structural analysis to derive the load-deflection characteristics of elastic-plastic beams at various stages of cyclic history.

A brief account is presented of a fatigue machine designed and constructed for testing mild steel at low endurance levels. A fixture for pure bending is designed to adapt the machine for testing beams and also to provide a measuring system for the applied alternating moments. A meter to measure the curvature in this environment is also described in detail. Similar fixtures are also described for testing cantilever-beam specimens.

Moment-curvature models are generated for beams under terminal alternating moments in which ambient strain conditions are controlled.

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References

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  2. Topper, T. H., and Biggs, W. D., “The Cyclic Behaviour of Mild Steel at Low Endurances,” Appl. Matrl. Res., 131–137, (July 1966).

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Authors and Affiliations

  1. Department of Civil Engineering, University of Waterloo, Waterloo, Ontario, Canada

    S. Krishnasamy (Research Assistant Professor)

  2. Faculty of Engineering, University of Waterloo, Waterloo, Ontario, Canada

    A. N. Sherbourne (Professor of Civil Engineering and Dean)

Authors
  1. S. Krishnasamy
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  2. A. N. Sherbourne
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Krishnasamy, S., Sherbourne, A.N. Response of a “Plastic hinge” to low-cycle alternating deflections. Experimental Mechanics 8, 241–248 (1968). https://doi.org/10.1007/BF02327020

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  • DOI: https://doi.org/10.1007/BF02327020

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