oa Civil Engineering = Siviele Ingenieurswese - Proposed calculation method for deflections
|Article Title||Proposed calculation method for deflections|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Civil Engineering = Siviele Ingenieurswese|
|Affiliations||1 Bruinette Kruger Stofberf Inc., Johannesburg, South Africa|
|Publication Date||Jun 1985|
|Pages||303 - 312|
|Keyword(s)||Beam, Deflection calculation, reinforced concrete members and Strain distributions|
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.
Article metrics loading...