Study on the Shear Strength of Partially Prestressed High Strength Concrete I Beams
Date Issued
2015
Date
2015
Author(s)
Long, Hoang Thanh
Abstract
Partial prestressing, which fills the gap between fully prestressed concrete and reinforced concrete, has now been accepted and becomes common practice in many countries. Partial prestressing has now been recognized as an intermediate case between full prestressing and conventional (nonprestressed) reinforcing. Compared with fully prestressed concrete (FPC) structures, adoption of partial prestressing may result in increased ductility and energy absorption capacity, improved economy, as well as reduction of the camber and creep deformation due to prestress. This research aims to solve one of the most troublesome problems in partially prestressed concrete (PPC) beam, namely the shear problem. In fact, there is no rational model at present to predict the shear behavior of prestressed concrete structures and the strength of shear failures. Although there were a lot of studies and researches about shear strength in FPC beams but not much research about PPC beams in the world. Because of this deficiency, all the shear design provisions, such as those in the ACI 318-14 [1] and AASHTO LRFD Specification- 2012 [2], are empirical, complicated and have severe limitations. In this research, four full- scale prestressed high strength concrete I-beams were tested to study the effect of number of prestressing tendons and amounts of flexural nonprestressed steel. The cross section, web reinforcement, flexural ultimate moment, and shear span ratio (a/d) were held constants. The numbers of prestressing tendons and amounts of non-prestressed tensile were varied. The prestressing factor was defined by this equation: . Ap and As are the cross sectional areas of prestressed steel and non-prestressed tensile steel; and are the yield strength of prestressed steel and non-prestressed tensile steel. The results from these tests, together with those found in literature, were used to help the engineers have an overview about the behavior of shear strength in partially prestressed high strength concrete beam.
Subjects
Shear strength
partially prestressed concrete beam
high strength concrete
Type
thesis
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