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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Summary This paper provides a short guide and worked examples illustrating the use of AS 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. The soil type is determined by a geotechnical investigation for taller longer period structures.
This value is then multiplied by the probability factor kp az determine the site hazard value kpZ for the appropriate annual probability of exceedance. Hazard at the site Once the appropriate annual probability of exceedance has been determined, AS This is required for the highest hazard levels and tallest structures.
A similar approach to reducing loads assuming a higher Mu value could be used where Z is high. Earthquake actions in Australia AS Snow and ice actions Part 4: The material in which the structure is laterally coupled to the ground provides the site class.
AS 1170.4_Earthquake Actions in Australia_2007.pdf
Once the horizontal design action is calculated from the above information and the seismic weight of the structure, analysis can be carried out. The Table below shows how for many structures, there are points at which no further work is required. For Australian conditions, where we have scant knowledge of the earthquake activity, we 1710.4 for a lateral equivalent static load, unless the structure is particularly vulnerable to dynamic effects.
The aim is to avoid collapse. As with all the parts of the series, Part 0 provides the annual probabilities of exceedance or, for buildings covered by the BCA, refers the user to those provided in the BCA.
Quick paths to an exit If you are designing one of the following structures, you can exit quickly to a simplified solution or even out of the Earthquake Standard altogether: 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.
The motivation for this move is the GATT agreement and the reduction of technical barriers to trade. General principles Part 1: Earlier this year CSIR Also, as a result of the lower earthquake loads expected, 117.04 detailing required is minimal compared to that for such countries as New Zealand. Earthquake actions in Australia. 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.
Once the 1170.4 of Mu is selected the structure must then be sa to achieve that selected ductility. It is calculated by a simple equation given in Section 6 of the Standard. The basic aim is to state the design event in terms of the annual probability of the action 1170.
exceeded. 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.
AS – Australian Earthquake Engineering Society
The base shear may 1170.44 understood to be the percentage of the weight of the building to be applied laterally eg. Analysis of the structure is not covered. Generally, for short structures that are not ax high importance, simply knowing whether the structure sits on rock or in soils of some depth eg.
The key to understanding AS Wind actions Part 3: In cases where a static or dynamic analysis is required, the first mode natural period of vibration of the structure is calculated T1.
General principles provides the link between the limit states actions imposed on the structure and the design of ae for resistance. For dynamic analysis, the effects of a number of periods of vibration may be summed to determine the action effects in the members and, therefore, a number of spectral shape factors may be used in the analysis.
The equation is based 11700.4 on the height of the structure, but includes an adjustment for material type. Detailing rules to achieve these levels of ductility can be highly complex. The ductility is achieved by applying the detailing provided in the materials design Standards currently in use.
AS Earthquake actions in Australia Worked examples_百度文库
If they do, the structure will not exhibit the ductility required of it and will therefore attract a much higher load than that for which it is designed.
The loads on the structure are then calculated based on this value. The standard also sets out minimum detailing requirements that aim to provide buildings with a reasonable level of ductility.
The site hazard is determined from Section 3 of the Standard.
The use of annual probabilities in the examples is based on recommendations to be proposed for adoption in the BCA at the time ae adoption of the new Standard: