AS 1170.4 PDF

Australian Standard – Commentary. AEES member and past president John Wilson has produced a publication titled “AS Summary This paper provides a short guide and worked examples illustrating the use of AS Structural design actions Part 4. Download AS _Earthquake Actions in Australia_pdf.

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This was a group of loading experts from across the APEC region that met to create a means of establishing inter-changeability between the loading codes of different nations.

The Standard also provides the means for reducing earthquake 1710.4 on a structure by achieving set levels of ductility. This led to the development of Part 0. The analysis and materials design is where AS Determining the period of an existing structure, however, is a simple exercise involving measuring its vibrations.

The method of calculation given is the most reliable method available other than carrying out a full dynamic analysis and even then there are inherent modeling inaccuracies. One of the fundamental principles of this approach is the removal of hidden factors through the provision of an umbrella document that defines the loading and resistance levels for design using the design event approach.

The base shear may be understood to be the percentage of the weight of the building to be applied laterally eg. The examples assume that at least a static analysis has been selected, and therefore, sets out the data required to calculate the base shear. Summary This paper provides a short guide and worked examples illustrating the use of AS Therefore, it is not expected that a structure subject to the design earthquake would be undamaged, but rather that the damage had not progressed to collapse.


Analysis of the structure is not covered. The loads on the structure are then calculated based on this value. For the lowest values i.

AS 1170.4_Earthquake Actions in Australia_2007.pdf

Earlier this year CSIR The Table below shows how for many structures, there are points at which no further work is required. The Standard assumes that structures are irregular as the vast majority of structures in Australia fail to achieve regularity. The load is then defined for any annual probability of exceedance so that the design event is independent of the technical definition of the loads. A similar approach to reducing loads assuming a higher Mu value could be used where Z is high.

Australian Standards AS Seismic Performance of Engineering Systems

A simple method for distributing the earthquake actions to the levels of the structure 11704 provided. The materials design Standards are then used to design the members for the required resistance including achieving the ductility assumed in determining the loads.

Mu the Greek letter represents the structural ductility while Sp, the structural performance factor, is an adjustment made to calibrate the known performance of structure types to the calculated ductility. Selecting the analysis method Once the annual probability of exceedance, the hazard value for the site, the sub-soil conditions and the building height are known, the required design effort can be determined using Table 2. The soil type is determined by a geotechnical investigation for taller longer period structures.


Earthquake actions in Australia AS Section 6 sets out the method including the spectral shape factor, the structural ductility and performance factors, the natural period of vibration of the structure, etc. The aim is to avoid collapse. Therefore, the materials design Standards are much simpler than those required in high hazard areas.

Period of vibration of the structure The construction material, type of structure, and the period of the first mode of vibration all have an influence on the forces experienced by the structure. Generally, for short structures 1710.4 are not of high importance, simply knowing whether the structure sits on rock or in soils of some depth eg. Wind actions Part 3: It is ss by a simple equation given in Section 6 of the Standard.

This approach arises from the small knowledge we zs of earthquake risk in Australia coupled with the very low levels of earthquake risk we do currently expect. Detailing rules to achieve these levels of ductility can be highly complex. Spectral shape factor site hazard spectrum The period is then used to determine the spectral shape factor Ch T1 for the building on the site.