Macalloy Post Tensioning System

Macalloy Bar Systems are ideal for the economic application of post-tensioning forces on relatively short tendons.

The robust coarse thread (CT) on the Macalloy bar ensures rapid and reliable assembly. This is particularly suitable for onsite use and reuse.

This listing contains the following information:

Bar Dimensions and mass
Mechanical properties for bars
Characteristic loads for bars
Component parameters
Suggested end block reinforcement
Minimum anchorage spacing and edge distance

Assembly

A more detailed explanation of the Macalloy Post Tensioning System is available in the Macalloy Design Data Handbook. There are many permutations possible to achieve satisfactory construction details, and advice is readily available from SRG. Bar diameters up to 50mm have ETA approval.

End thread dimensions

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Bar dimensions and properties

Dimensions and Mass

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Mechanical Properties

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Components

Figure:

Bar components

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Duct Dimensions

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Suggested mild steel end block reinforcement

Bursting tensile forces are induced in the concrete immediately behind the anchorage end plates due to the compressive load applied through the end plates. Reinforcement in the form of links, helices or a combination of these may be required to adequately resist these forces. When designing the end blocks, consideration should be given to (a) bursting forces around individual anchorages, (b) the overall equilibrium of the end block, (c) spalling of the concrete from the loaded face around anchorages. Helical and link reinforcement which is adequate for use with a standard Macalloy end plate and in compliance with Etag 013, is detailed in the Figure and Table below. All reinforcement to BS EN 100890: 2005, Grade 460 to BS4449: 1997 or Grade 500 to BS449: 2005. A longitudinal length of rod may be used to attach the links together, but it is not required as part of the reinforcement.

Figure:

Typical end block arrangement

Tendon spacing and edge distance (single tendons)

For single tendons (ie single bars within a duct with one single end bearing plate per bar) with reinforcement as per this listing, the recommended duct and end plate sizes are shown in the table below. To suit particular requirements, the dimensions can be varied provided that concrete cover, load transfer and stress conditions are satisfactory

Figure:

Minimum anchorage spacing and edge distance

Jack details

Components

Figure:

Jack components

Dimensions

Figure:

Jack dimensions

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