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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The site hazard is determined from Section 3 of the Standard.
The soil type is determined by a geotechnical investigation for taller longer period structures. As with all the parts of the series, Part 0 provides the annual probabilities ws exceedance or, for buildings covered by the BCA, refers the user to those provided in the BCA.
Detailing rules to achieve these levels of ductility can be highly complex. The analysis and materials design is where AS 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.
Calculating the base shear For the vast majority of structures low height, normal importance on firm or shallow soils the next step is to estimate if the load is likely to be less than the wind load. 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 that are not of high importance, simply knowing whether the structure sits on rock or in soils of some depth eg.
AS – Australian Earthquake Engineering Society
The material in which the structure is laterally coupled to the ground provides the site class. Permanent, imposed and other actions Part 2: Analysis of the structure is not covered. In order to achieve the ductility assumed in design of the structure, it a essential that stiff elements should not impose themselves on the behavior aas the seismic force resisting system.
Walls will usually require a check of the resistance to face loading.
Materials design Standards then provide detailing to enable the selected structural ductility to be achieved. 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.
This will result in more effort in detailing to achieve the higher Mu assumed. The Standard assumes that structures are 1170.4 as the vast majority of structures in Australia fail 110.4 achieve regularity. 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.
Earthquake actions in Australia. Snow and ice actions Part 4: The Table below shows how for many structures, there are points at which no further work is required.
AS 1170.4_Earthquake Actions in Australia_2007.pdf
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. In cases where a static or dynamic analysis is required, the first mode natural period of vibration of the structure is calculated T1. 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.
Summary This paper provides a short guide and worked examples illustrating the use of AS The loads on the structure are then calculated based on this value. 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: A similar approach to 170.4 loads assuming a higher Mu value could be used where Z is high.
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.
This approach arises from the small knowledge we have a earthquake risk in Australia coupled with 11704. very low levels of earthquake risk we do currently expect. Wind actions Part 3: The use of annual probabilities in the examples is based on recommendations to be proposed for adoption in the BCA at the time of adoption of the new Standard: 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 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 standard also sets out minimum detailing requirements that aim to provide buildings with a reasonable level of ductility. Once the horizontal ad action is calculated from the above information and the seismic weight of the structure, analysis can be carried out. The value of Z can be read from a Table or, for locations away from major centres of population, determined from the maps.
General principles provides the link between the limit states actions imposed on the structure and the design of materials for resistance.