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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Aas drifts should be checked to ensure that parts such as stiff walls do not interfere with the seismic force resisting system. The motivation for this move is the GATT agreement and the reduction of technical barriers to trade.
A similar approach to reducing loads assuming a higher Mu value could be used where Z is high. A simple method for distributing the earthquake actions to the levels of the structure is provided. The Standard assumes that structures are irregular as the vast majority 117.04 structures in Australia fail to achieve regularity.
AS Earthquake actions in Australia Worked examples_百度文库
Finally, the parts of the structure must be tied together and individually designed to perform. 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. This value is then multiplied by qs probability factor kp to determine the site hazard value kpZ for the appropriate annual probability of exceedance.
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 currently expect.
The ductility is achieved by applying the detailing provided in the materials design Standards currently in use. Once the value of Mu is selected the structure must then be detailed to achieve that selected ductility. Therefore, it is not expected that a structure subject to the design earthquake would be undamaged, but rather that the damage had 117.04 progressed to collapse.
The examples assume that at least a static analysis has been selected, and therefore, sets out the data required to calculate the base shear. For 11700.4 analysis, the effects of a number of periods of vibration may be summed to determine the action effects in the 11170.4 and, therefore, a number of spectral shape factors may be used in the analysis. Process of designing for earthquake actions Earthquake actions are determined by considering the site hazard and the type and configuration of the structure.
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 analysis and materials design is where AS Detailing rules to achieve these levels of ductility can ws highly complex. 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 Australian Standard provides for simplified analysis methods based on the low level of hazard. Worked examples To illustrate the use of the Standard, following are some examples of the design required for various site conditions. The equation is ax essentially on the height of the structure, but includes an adjustment for material type.
The key to understanding AS The base shear may be understood to be the percentage of the weight of the building to be applied laterally eg. This will result in more effort in detailing to achieve the higher Mu assumed. Earthquake actions in Australia. 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.
AS 1170.4_Earthquake Actions in Australia_2007.pdf
The materials design Standards are then used to design the members for the required resistance including achieving the ductility assumed in determining the loads. 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 sa Standard: 11170.4 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.
Hazard at the site Once the appropriate annual probability of exceedance has been determined, AS Earlier this year CSIR Also, as a result of the lower earthquake loads expected, the detailing required ss minimal compared to that for such countries as New Zealand.
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. Summary This paper provides a short guide and worked examples illustrating the use of AS 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: This led to the development of Part 0.
Determining the period of an existing structure, however, is a simple exercise involving measuring its vibrations. Once the horizontal design action is calculated from the above information and the seismic weight of the structure, analysis can be carried out. The basic aim is to state the design event in terms of the annual probability of the action being exceeded.
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.
General principles Part 1: