oa Civil Engineering = Siviele Ingenieurswese - Discussion on: Proposed calculation method for deflections
|Article Title||Discussion on: Proposed calculation method for deflections|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Civil Engineering = Siviele Ingenieurswese|
|Affiliations||1 Bruinette, Kruger, Stoffberg Inc., Johannesburg|
|Publication Date||Nov 1985|
|Pages||583 - 584|
|Keyword(s)||Creep, Deflection, Humidity and Reinforced concrete|
A new simplified method for long-term deflection calculations of reinforced concrete members was presented. The method defined a modular ratio for creep conditions based on laboratory verified strain distributions In beams for both immediate and long-term conditions. A simple formula was 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 was recommended that relates the creep factor to ambient relative humidity, age of loading and surface area to volume ralio of the member. Calculated deflections using the method were compared with laboratory measured values reported in the liIerature.
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