Development Length of 5mm Indented Pretensioned Wire in High Strength Concrete

Muller, Johann (2003). Development Length of 5mm Indented Pretensioned Wire in High Strength Concrete Honours Thesis, School of Engineering, The University of Queensland.

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Author Muller, Johann
Thesis Title Development Length of 5mm Indented Pretensioned Wire in High Strength Concrete
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2003
Thesis type Honours Thesis
Supervisor Peter Dux
Total pages 80
Language eng
Subjects 0905 Civil Engineering
Formatted abstract
The development length for pretensioned wire is dependant upon various factors including concrete strength, wire diameter, type of wire. The development length however may  control geometric factors of the concrete design. For example in railway sleepers the end of the  sleeper is 500mm away from the centre of the rail seat. If however the development length can be  found to be less than the current Australian Standard requirements significant cost savings can  then be made due to the reduction of materials used.

The development length for indented pretensioned wire placed in concrete with a transfer strength  higher than 32MPa is currently set as at 100 times the tendon diameter. So for 5mm wire the  development length is said to be 500mm.

Tests were conducted using two methods, a standard sleeper test (AS1085.14) modified to induce bond  failure, and a pullout test to analyse the development length without the aid of the compression  struts associated with the sleeper test.

The results of the limited number of sleeper test performed indicated that the development length  is between 250mm and 285mm. therefore a length of 285mm is satisfactory to carry the yield strength  of the wire.

The results of the pullout tests indicate that the development length lies between 250mm and 350mm.  It can therefore be said that 350mm is sufficient to carry the yield strength. However further  research is required in the region around the 300mm since one specimen fail due to bond, while the  other failed due to yielding. The pullout test resulted in a development length greater than that  of the sleeper test as expected since the sleeper test arrangement involves a compression strut  aiding the grip on the wire in the development region.
Keyword High Strength Concrete

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Thu, 07 May 2015, 14:15:03 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service