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    Brief comments on elastic flexibility of reinforced concrete frames
 and significance to seismic design

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    Date
    1998-12-31
    Author
    Priestley, M. J. N.
    Metadata
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    Abstract
    It is shown, from analysis of typical reinforced concrete beam sections, that current design practice, which assumes beam stiffness is independent of reinforcement ratio but equal to a constant fraction of gross section stiffness is inappropriate. The analyses indicate that effective beam yield curvature can be considered constant, when non-dimensionalized by beam depth and yield strain, indicating that beam stiffness is proportional to strength. Based on this observation, a simple expression for yield drift of frames is proposed and is calibrated by comparing with results of a large number of beam/column subassemblage experiments. Good agreement is obtained. It is pointed out that current estimates of frame stiffness are generally too high. A consequence is that simple calculations show that the vast majority of frame buildings will be unable to achieve code design ductility levels before exceeding code drift limitations.
    URI
    https://doi.org/10.5459/bnzsee.31.4.246-259
    Published in
    • Bulletin of the New Zealand Society for Earthquake Engineering

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