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|Title:||Creep in prestressed concrete beams under time-varying sustained loading|
|Citation:||Australian Journal of Structural Engineering, 2014; 15(3):260-268|
|Publisher:||Institution of Engineers Australia|
|Abstract:||In the design of prestressed concrete flexural members it is necessary to allow for the long-term effects of creep and shrinkage, particularly in regard to deflections and prestress loss. Various analytic methods can be used to evaluate these long-term effects, but the calculations for creep become extended and complex if, as is usually the case, the sustained load on the member varies over time. In this study a simplified, approximate method is proposed for dealing with creep under a varying load history. The time-varying moment history in the cross-section of a member is replaced by a constant, sustained, “equivalent” moment, Meq, which has the same long-term effect as the time-varying moment. This equivalent moment can be used together with any appropriate constant-moment creep analysis, but is here combined with previously-derived, closed-form expressions for loss of prestress and creep curvature. The result is a simple procedure for dealing with creep in prestressed members under time- varying sustained loads.|
|Keywords:||Creep; prestressed concrete; beams; defl ections; time-varying; sustained load|
|Rights:||© Institution of Engineers Australia, 2014|
|Appears in Collections:||Aurora harvest 7|
Civil and Environmental Engineering publications
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