1 Postgraduate Student
2 Honorary Associate, Department of Civil. Surveying and Environmental Engineering, University of Newcastle. NSW. 2308. Australia
3 CBPI Professor in Structural Clay Brickwork. Dean. Faculty of Engineering, University of Newcastle. NSW. 2308. Australia
ABSTRACT
An experimental investigation to determine transfer length in prestressed hollow clay masonry is reported. Wallettes and stack bonded masonry prisms were constructed using extruded hollow clay brick units. Seven-wire standard prestressing strands of nominal diameter of 9.6 mm were installed in the cores of the hollow masonry, externally prestressed, the cores grouted, and after curing, the strands released. Three techniques were used to determine the transfer length; from the measurement of surface strains; from the measured tendon draw-in using existing empirical relationships: and from repetitive bending tests on the wallettes and prisms with each joint being loaded in turn until cracking occurred. The transfer lengths thus obtained were then compared with the transfer lengths calculated using recommended rules for prestressed concrete. and a simple expression for transfer length was derived.
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