Design, construction and maintenance of residential slabs is regulated by Australian Standard AS – Residential slabs and footings. Australian Standard AS – Time for a change. With specific reference to the slab heave problem with waffle rafts. Frank Van der Woude, B.E., Ph.D. AGS Vic. complying with the Australian Standard – AS referenced by the BCA. AS covers the design and construction of residential slabs and footings.

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For example, the introduction of the H2 classification sees the requirement for N16 tsandard bars to be used in all edge beams and internal beams of the slab typical on a waffle slab. To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, contact your engineer.

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Powered by Site Ninja. This Standard sets out the criteria for the classification of a site and the design and construction of a footing system for a single dwelling house, townhouse or similar structure which may be detached or separated by a party wall or common wall, but not situated vertically above or below another dwelling, including buildings classified as Class 1 and Class 10a in the Building Code of Australia.

Your email address will not be published. January December Because Local Authorities required professional engineer certification of residential slab aas2870 footing designs, I diligently assessed the structural adequacy of standard designs prescribed in AS The footing systems for which designs are given include slab on ground, stiffened rafts, waffle rafts, strip footings, pad footings and piled footings.

AS — specifies performance criteria and specific designs for footing systems for foundation conditions commonly found in Australia.

Welcome to my engineering blog – Australian Standard AS

The Australian Standard has Changed. Regards David my mobile is Reply Leave a Reply. Steel Reinforcing Calculations Some of the reinforcing requirements for design have changed and have the potential to have a significant affect on the cost of a waffle slab.

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australuan This is a free 7 page sample. The position of the trees do not comply with the Australian building standards code but council is not supportive.

A soil’s Ys rating is its indication of movement potential. Either way, I will never disclose your personal details to any other party. No need to be fancy, just an overview. This change applies to all slab australiah across all site classification types. Subsequent in-depth research revealed that the theory underlying the prescription of standard slabs in AS is seriously technically flawed, consequently causing an unprecedented and unsustainable level of incidence of premature failures.

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sfandard Powered by Create your own unique website with customizable templates. For design purposes, the life of the structure is taken to be 50 years.

Why PolyVoid Soil Characteristics. Your comments will be very much appreciated. Economical designs that avoid significant damage are practicable only if the soil moisture content of the foundation material under the footing or slab is stable or within reasonable limits of stability over the design life of the house or structure. Author Write something about yourself.

The table above highlights one of the most significant changes to the code, being the splitting of the “H” classification into two new classes, H1 and H2. For all sites in particular sites with reactive soils drainage and soil moisture conditions around the building need to be managed to as28700 abnormal moisture conditions, as outlined in Clause 1. These changes will also see the cost of a “conventional” waffle go up as more piers will be specified in order to satisfy the austrailan requirements of the code.

PolyVoid – The Australian Standard has Changed

It was approved on behalf of the Council of Standards Australia on 20 December More Code Information To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, australiab your engineer.

Rudimentary engineering calculations raised my initial concern qustralian some standard slabs were not strong enough to withstand the combined effects of static loading and dynamic foundation movement they had supposedly been designed to withstand.


Menu Home PolyVoid Management. Some of the reinforcing requirements for design have changed and have the potential to have a significant affect on the cost of a waffle slab. Please write a comment Cancel reply Your email address will not be published. Could you please send me the 7 page sample. Please enable JavaScript on your browser to best view this site. These calculation changes will ultimately see waffle slabs being more heavily piered than previously.

This Standard was published on 17 Atandard AS — This is a free 7 page sample. The standard sets out the criteria for the classification of a site, and the design and. Key Contacts Make an Enquiry. I would like to talk to some one from your department if possible.

I would like to remove them due standrad safety and to prevent damage to the house and drainage. AS Code Changes.

It is measured in millimetres and suggests the value of which the soil might move due to changes in moisture. This latest release has seen a number of austalian introduced which will in turn affect the current design calculations for residential slabs-on-ground. Photo Gallery – Installation. There has also been a revision of the mesh requirements for ‘slab length’.

I have some trees that are too close to the house. Coincidentally with the introduction of AS inI started a consulting engineering practice in and around Brisbane, specializing in residential slab and footing design. For more information about ASclick here: The previous code revision called for reinforcing mesh to be upgraded to the next specification when a concrete slab was greater than 25 metres in length.