AS 1170.4 PDF

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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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AS Earthquake actions in Australia Worked examples_百度文库

In the event that a structure is subject to an earthquake, the ductility provided greatly improves its performance, regardless of the actual magnitude of the earthquake and the actual design actions.

Process of designing for earthquake actions Earthquake actions are determined by considering the site hazard and the type and configuration of the structure. Many structures do not require this level of design effort as there are qs for which no further work is required by the Standard. This is required for the highest hazard levels and tallest structures. Therefore, the qs design Standards are much simpler than those required in high hazard areas.

Earthquake actions in Australia. The base shear may be understood to be the percentage of the weight of the building to be applied laterally eg. The method 1170. calculation given is the most reliable method available other than carrying out a full dynamic analysis and even then there are inherent modeling inaccuracies.

The site hazard is determined from Section 3 of the Standard. A simple method for distributing the earthquake actions to the levels of the structure is provided.

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AS 1170.4_Earthquake Actions in Australia_2007.pdf

Finally, the parts az the structure must be tied together and individually designed to perform. The equation is based essentially on the height of the structure, but includes an adjustment for material type. This paper assumes that at least a static analysis has been selected, and therefore, the remaining data required to calculate the base shear has to be determined.

The examples assume that at least a static analysis has been selected, and therefore, sets out the data required to calculate the base shear. General principles Part 1: The Australian Standard provides for simplified analysis methods based on the low level of hazard.

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.

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. The materials design Standards are then used to design the members for the required resistance including achieving the ductility assumed in determining the loads. Once the value of Mu is selected the structure must then be ss to achieve that selected 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.

For the lowest values i. This approach arises from the small knowledge we have of earthquake risk in Australia coupled with the very low levels of earthquake risk we do xs expect. Permanent, imposed and other actions Part 2: This requires the structure and indeed the whole building to be able to deform with the earthquake and absorb energy without vertical supports giving way.


The Table below shows how for many structures, there are points at which no further work is 1170.44. The basic 1710.4 is to state the design event in terms of the annual probability of the action being exceeded. Wind actions Part 3: The key to understanding AS Determining the period of an existing structure, however, is a simple exercise involving measuring its vibrations.

The ductility is achieved by applying the detailing provided in the materials design Standards currently in use. Earthquake actions in Australia AS The Standard also provides the means for reducing earthquake loads on a structure by achieving set levels of ductility. The motivation for this move is the GATT agreement and the reduction of technical barriers to trade. The loads on the structure are then calculated based on sa value.

Walls qs usually require a check of the resistance to face loading.