We hear it from our customers everyday, trying to wrap your head around all the different aspects involved in determing what is required on any project can be tedious. Different building classifications in New Zealand and Australia all have an effect on their seismic code requirements. Whether you are trying to gain better understanding of how seismic requirements are determined, or just trying to complete what is required on a given project Vaico can help.
If you are unsure of what Seismic Design Category (SDC) your project may fall under it can typically be found in the structural notes section of your construction drawings, or they may also be listed in the project specification. If you are still having trouble determining what category it falls under, Vaico has staff available that can walk you through your project details and determine your seismic building code requirements.
|P1||Part representing a hazard to life outside the structure||Part weighing more than 10 kg and able to fall more than 3 metres onto a publicly accessible area||ULS|
|P2||Part representing a hazard to a crowd of greater than 100 people within the|
|Part weighing more than 10 kg and able to fall more than 3 metres onto a publicly accessible area||ULS|
|P3||Part representing a hazard to individual life within the structure||Part weighing more than 10 kg and able to fall more than 3 metres onto a publicly accessible area||ULS|
|P4||Part necessary for the continuing function of the evacuation and life safety systems within the structure||ULS|
|P5||Part required for the operational continuity of the structure||Only parts essential to the operational continuity of structures with importance level 4 will be classified as P5 – non-essential parts and parts within structures of other importance levels will be otherwise classified||SLS2|
|P6||Part for which the consequential damage caused by its failure is disproportionately great||SLS1|
|P7||All other parts||SLS1|
B1/VM1 (which references AS/NZS 1170.0:2002 Appendix 2) defines building importance levels as shown in Table 5 below. The building importance level (IL) shall be nominated on the design documentation.
|Table 5: Building importance levels.||Description of building type||Specific structure|
|1||Buildings posing low risk to human life or the environment or a low economic cost should the building fail. These are typically small non-habitable buildings, such as sheds, barns and the like that are not normally occupied, though they may have occupants from time to time.||
|2||Buildings posing normal risk to human life or the environment or a normal economic cost, should the building fail. These are typical residential, commercial and industrial buildings.||
|3||Buildings of a higher level of societal benefit or importance or with higher levels of risk significant factors to building|
occupants. These buildings have increased performance requirements because they may house large numbers of
people, vulnerable populations or occupants with other risk factors or fulfil a role of increased importance to the local community or to society in general.
|4||Buildings that are essential to post-disaster recovery or|
associated with hazardous facilities.
|5||Buildings whose failure poses catastrophic risk to a large area (e.g. 100 km2) or a large number of people (e.g. 100,000).||
Achievement of 100% compliance is regarded as the embodiment of good practice, but it is in fact the absolute minimum acceptable standard. This could be informally addressed by engineers discussing alternatives with their clients, but in the past this has met with resistance, mostly over misunderstood cost perceptions. A better client education process, with more explanation in the Building Code is needed. This is where the experience of Vaico and the ISAT partnership is unmatched in New Zealand and across the globe.Contact Vaico to learn more