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. This is required for the highest hazard levels and tallest structures. Summary This paper provides a short guide and worked examples illustrating the use of AS For Australian conditions, where we have scant knowledge of the earthquake activity, we design for a lateral equivalent static load, unless the structure is particularly vulnerable to dynamic effects.
AS 1170.4_Earthquake Actions in Australia_2007.pdf
The Standard also provides the means for reducing earthquake loads on a structure by achieving set levels of ductility. The Standard assumes that structures are irregular 1170.44 the vast majority of structures in Australia fail to achieve regularity. 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.
The standard also sets out minimum detailing requirements that aim to provide buildings with a reasonable level of ductility. 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.
For dynamic analysis, the effects of a number of periods of vibration may be summed to determine the action 170.4 in the members and, therefore, a number of spectral shape factors may be used in the analysis.
The soil type is determined by a geotechnical investigation for taller longer period structures. Therefore, it is not expected that a structure subject to the design earthquake would be undamaged, 11704. rather that ae damage had not progressed to collapse.
This will result in more effort in detailing to achieve the higher Mu assumed. 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. 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: Snow and ice actions Part 4: 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.
Hazard at the site Once the appropriate annual probability of exceedance has been determined, AS Process of designing for earthquake actions Earthquake actions are determined by considering the site hazard and the type and configuration of the structure.
Also, as a result of the lower earthquake loads expected, the detailing required is minimal compared to that for such countries as New Zealand.
AS _Earthquake Actions in Australia_pdf – Free Download PDF
This paper assumes that at least a static analysis has been selected, and therefore, the remaining data required to calculate the base shear 11704 to be determined. The equation is based essentially on the height of the structure, but includes an adjustment for material type. 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 material in which the structure is laterally coupled to the ground provides the site class. The motivation for this move is the GATT agreement and the reduction of technical barriers to trade.
Permanent, imposed and other actions Part 2: Determining the period of an existing structure, however, is a simple exercise involving measuring its vibrations.
Materials design Standards then provide detailing to enable the selected structural ductility to be achieved.
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.
Earthquake actions in Australia AS The Table below shows how for many structures, there are points at which no further work is required. Once the horizontal design action is calculated az the above information and the seismic weight of the structure, analysis can be carried out.
The key to understanding AS Worked examples To illustrate the use of the Standard, following are some examples of the design required for various site conditions. Analysis of the structure is not covered. This led to the development of Part 0. General principles provides the link between the limit states actions imposed on the structure and the design of materials for resistance. aa