C.J. Burgoyne
Lecturer, Department of Engineering, University of Cambridge,
Cambridge, UK
T.J. Ibell
Engineer, Sasol Technology, South
Africa
In this paper, upper- and
lower-bound methods of analysis are developed for the problem of anchorage
zones in prestressed concrete. These methods are compared with and validated
against experimental test results. It is shown that such methods accurately
model both the failure loads and behaviour of anchorage zones for prestressed
concrete.
When a large prestressing force is
applied to the end of a beam over a small anchorage area, tensile bursting
stresses are developed behind the anchor plate. The problem of analysing the
bursting stresses in concrete blocks under concentrated loading has been
investigated in the past by several researchers. Such work has led to commonly
accepted empirical design methods for the detailing of steel reinforcement in
end blocks.
The present experimental series was
carried out in order to study the effect of steel quantity and positioning on
the load-carrying of strip-loaded end blocks. The results from this test series
would then be used to verify upper- and lower-bound theories for the analysis
of end blocks.
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