serviceability limit state

Polish translation: stan graniczny funkcjonalności

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:serviceability limit state
Polish translation:stan graniczny funkcjonalności
Entered by: sobaga

12:06 Aug 26, 2001
English to Polish translations [PRO]
Tech/Engineering
English term or phrase: serviceability limit state
This kind of interaction between the analytical and experimental disciplines is always necessary when some phenomenon causes uncertainty as to the estimation of the design resistance (ultimate limit state) or the deformation (serviceability limit state).
sobaga
Ireland
Local time: 07:56
stan graniczny funkcjonalnosci
Explanation:
Patrz www.stramit.com.au/news/v5n4/

Introduction to limit-state design

Limit-state is a design philosophy that now replaces permissible design in Australian Standards.

Limit-state is a way of designing an object by separately ensuring that it can perform each of the required functions. The method takes account of the risk involved, the factors that affect the object's ability and the factors that affect the anticipated duty or loading.

The previously used permissible design compares what an object can do against the job required at a level that incorporates a single all-embracing safety factor. This safety factor may be appropriate for some aspects of the design, but will not be appropriate for all. This can lead to design inefficiencies or even an unacceptable risk level.

Serviceability and strength are the two limit-states used in the design of building products. Serviceability limit-state is the level at which full functionality is maintained, with no permanent product distortion and with an acceptable level of deflection. Strength limit-state is the point beyond which the structure would no longer stay in place or no longer sustain the required load.

An interesting practical example was provided by the 1999 Sydney hailstorm. Many tiled roofs (around 20,000) failed the serviceability limit-state criteria because of a permanent loss of function (they leaked!). Similarly, the shattered tiled roofs failed the strength limit-state (either because the duty was not correctly identified or the risk was accepted) leading to grave risk to occupants.

In the same storm, some metal roofs arguably failed one serviceability criterion because they sustained permanent dents, although full functionality was maintained. These metal roofs all passed the strength limit-state.

Generally, the limit-state approach should have little impact on most design outcomes. Limit-state changes the way some data are derived and, in some cases, the way data are presented. It does not change the products, the loads or the laws of physics. Everything is the same, only the underlying design philosophy has changed.

However, it is important when comparing performance data between manufacturers that the data are both in the same format - either limit-state or permissible. There are some key words that will assist in identifying which is which. Limit-state information may also be shown as "design capacity" or referred to as "load and resistance factor design" or LRFD. Simply the word "capacity" or "ultimate" usually implies limit-state. Permissible information is also typically called "allowable" or "safe loads".

Stramit Product Technical Manuals are now based on the latest limit-state Australian Standards. As well as providing data in limit-state format, the Stramit Product Technical Manuals contain more comprehensive information to assist with selection and specification. The Stramit Interactive CD-ROM has also been prepared using limit-state design principles.

For more information, contact you local Stramit branch and request a copy of the new Information Guide titled Limit-State Design: Guide to Using the new Stramit Product Technical
Selected response from:

Jacek Krankowski (X)
Grading comment
Dzięki raz jeszcze :)
4 KudoZ points were awarded for this answer



Summary of answers provided
nastan graniczny funkcjonalnosci
Jacek Krankowski (X)


  

Answers


19 mins
stan graniczny funkcjonalnosci


Explanation:
Patrz www.stramit.com.au/news/v5n4/

Introduction to limit-state design

Limit-state is a design philosophy that now replaces permissible design in Australian Standards.

Limit-state is a way of designing an object by separately ensuring that it can perform each of the required functions. The method takes account of the risk involved, the factors that affect the object's ability and the factors that affect the anticipated duty or loading.

The previously used permissible design compares what an object can do against the job required at a level that incorporates a single all-embracing safety factor. This safety factor may be appropriate for some aspects of the design, but will not be appropriate for all. This can lead to design inefficiencies or even an unacceptable risk level.

Serviceability and strength are the two limit-states used in the design of building products. Serviceability limit-state is the level at which full functionality is maintained, with no permanent product distortion and with an acceptable level of deflection. Strength limit-state is the point beyond which the structure would no longer stay in place or no longer sustain the required load.

An interesting practical example was provided by the 1999 Sydney hailstorm. Many tiled roofs (around 20,000) failed the serviceability limit-state criteria because of a permanent loss of function (they leaked!). Similarly, the shattered tiled roofs failed the strength limit-state (either because the duty was not correctly identified or the risk was accepted) leading to grave risk to occupants.

In the same storm, some metal roofs arguably failed one serviceability criterion because they sustained permanent dents, although full functionality was maintained. These metal roofs all passed the strength limit-state.

Generally, the limit-state approach should have little impact on most design outcomes. Limit-state changes the way some data are derived and, in some cases, the way data are presented. It does not change the products, the loads or the laws of physics. Everything is the same, only the underlying design philosophy has changed.

However, it is important when comparing performance data between manufacturers that the data are both in the same format - either limit-state or permissible. There are some key words that will assist in identifying which is which. Limit-state information may also be shown as "design capacity" or referred to as "load and resistance factor design" or LRFD. Simply the word "capacity" or "ultimate" usually implies limit-state. Permissible information is also typically called "allowable" or "safe loads".

Stramit Product Technical Manuals are now based on the latest limit-state Australian Standards. As well as providing data in limit-state format, the Stramit Product Technical Manuals contain more comprehensive information to assist with selection and specification. The Stramit Interactive CD-ROM has also been prepared using limit-state design principles.

For more information, contact you local Stramit branch and request a copy of the new Information Guide titled Limit-State Design: Guide to Using the new Stramit Product Technical


Jacek Krankowski (X)
PRO pts in pair: 2960
Grading comment
Dzięki raz jeszcze :)
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