oa Civil Engineering = Siviele Ingenieurswese - Proposed calculation method for deflections

Volume 27, Issue 6
  • ISSN : 1021-2000



A new simplified method for long-term deflection calculations of reinforced concrete members Is presented. The method defines a modular ratio for creep conditions based on laboratory verified strain distributions In beams for both immediate and long-term conditions. A simple formula Is derived for the ratio of long term to immediate deflections. A value for the creep factor has to be assumed but a series of curves Is recommended that relates the creep factor to ambient relative humidity, age of loading and surface area to volume ratio of the member. Calculated deflections using the method are compared with laboratory measured values reported In the literature.

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