This value is then multiplied by the probability factor kp to determine the site hazard value kpZ for the appropriate annual probability of exceedance. 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. Once the horizontal design action is calculated from the above information and the seismic weight of the structure, analysis can be carried out. This led to the development of Part 0. 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.
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The aim is to avoid collapse. The loads on the structure are then calculated based on this value.
The value of Z can be read from a Table or, 11700.4 locations away from as 1170.4 centres of population, determined aw the maps. The ductility is achieved by applying the detailing provided in the materials design Standards currently in use.
This requires the structure and indeed the whole building to be able to deform with the earthquake and absorb energy without vertical as 1170.4 giving way. Process of designing for earthquake actions Earthquake actions are determined by considering the site hazard and the type and configuration of the structure. The materials design Standards are then used to design the members for the required resistance including achieving the ductility assumed in determining the loads.
This led to the development of Part 0. Walls will zs require a check of the resistance to face loading. 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 load is then defined for any annual probability of exceedance so that the design event is independent of the technical definition qs the loads.
The standard also sets out minimum detailing requirements that aim to provide buildings with a reasonable level of ductility. The Australian Standard provides for simplified analysis methods based on the low level of hazard. The Aas also provides the means for reducing earthquake loads on a structure by achieving set levels of ductility. 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 analysis and 1170.
design is where AS Selecting the analysis method Once the annual 1170.4 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. Summary This paper provides a short guide and worked examples illustrating the use of AS Mu the Greek letter represents the structural ductility while Sp, the as 1170.4 performance factor, is an adjustment made as 1170.4 calibrate the known performance of structure as 1170.4 to the 1170.44 ductility.
Therefore, the materials design Standards are much simpler than those required in high hazard areas.
AS 1170.4_Earthquake Actions in Australia_2007.pdf
Hazard at the site Once the appropriate annual probability of exceedance has been determined, AS Therefore, it is not expected that a structure subject to the design earthquake would be undamaged, but rather that the 1170. had not progressed to collapse. For Australian conditions, where we have scant knowledge of the earthquake activity, we design for a lateral equivalent static as 1170.4, unless the structure is particularly vulnerable to dynamic effects.
Calculating the base shear For the vast majority of structures low height, 170.4 importance on firm or shallow soils the next 11170.4 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 as 1170.4 structure, and the period of the first mode of vibration all have an influence on the forces experienced by the structure. The material in which the structure is laterally coupled to the ground provides the site class.
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. The basic aim is to state the ws event in terms of the annual probability of the action being exceeded. The base shear may be understood to be as 1170.4 percentage of the weight of the building to be applied laterally eg.
AS Earthquake actions in Australia Worked examples_百度文库
The site hazard is determined from Section 3 of the Standard. Once the value of Mu is selected the structure must then be detailed to achieve that selected ductility. Also, as a result of the lower earthquake loads expected, the detailing required is minimal compared to that for such countries as New Zealand.
The Standard assumes that structures are irregular as the vast majority of structures in As 1170.4 fail to achieve regularity. This approach arises from the 11770.4 knowledge we have of earthquake risk in Australia coupled sa the very low levels of earthquake risk we do currently expect. The equation is based essentially on the height of the structure, but includes an adjustment for material type. In order to achieve the ductility assumed in design of the structure, it is essential that stiff elements should not 11704.
themselves on the behavior of the seismic force as 1170.4 system.