Unified Approach for Computing Deflection of Steel and FRP Reinforced Concrete

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Title: Unified Approach for Computing Deflection of Steel and FRP Reinforced Concrete

Author(s): Peter H. Bischoff and Mohammadali Darabi

Publication: Special Publication

Volume: 284

Issue:

Appears on pages(s): 1-20

Keywords: deflection, effective moment of inertia, FRP, steel, tension stiffening

Date: 3/1/2012

Abstract:
A generalized design approach is presented using an effective moment of inertia to compute deflection of steel and fiber reinforced polymer (FRP) reinforced concrete. Realistic estimates of short term deflection are obtained by taking proper account of tension stiffening after cracking, shrinkage restraint, preloading from construction loads, and the variation in member stiffness along the member span. A simple slab example is used to demonstrate how account of the preceding effects can give a more flexible response and increase computed values of deflection four-fold. Long-term effects related to shrinkage and creep are also considered separately for computation of time-dependent deflection. Shrinkage is shown to affect both the short and long-term response of flexure members, and a slab example is used to demonstrate how the effects of shrinkage and creep can be considered separately in a rational manner to compute deflection.