Limit state design - Revision history

Designing Buildings at 07:13, 28 December 2022

2022-12-28T07:13:05Z

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	= What is limit state design =		= What is limit state design =

Designing Buildings at 07:11, 28 December 2022

2022-12-28T07:11:06Z

← Older revision		Revision as of 07:11, 28 December 2022
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−	= ~~Introduction~~ =	+	= What is limit state design =

−	~~Limit state design (LSD) refers to~~ a ~~structural engineering~~ design ~~method~~.	+	Loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on. Limit states are conditions of potential failure.

−	~~A degree of loading or other~~ actions ~~imposed on~~ a ~~structure can result in a ‘limit state’, where the~~ structure’s ~~condition no longer fulfils its~~ design ~~criteria, such as; fitness~~ for use~~, structural integrity, durability, and so on~~. Limit ~~states are conditions~~ of ~~potential failure~~.	+	Limit state design (LSD) is a structural engineering design method. All actions likely to occur during a structure’s design life are considered to ensure that the structure remains fit for use with appropriate levels of reliability. Limit state design involves estimating the subjected loads on a structure, choosing the sizes of members to check, and selecting the appropriate design criteria.

−	~~All actions likely to occur during a structure’s~~ design ~~life are considered during the LSD method, to ensure~~ that ~~the structure remains fit for use with appropriate levels of reliability.~~	+	Limit state design requires that two principal criteria are satisfied:

−	LSD involves estimating the subjected loads on a structure, choosing the sizes of members to check, and selecting the appropriate design criteria. LSD requires two principal criteria to be satisfied: the ultimate limit state (ULS) ~~and the serviceability~~ limit state (SLS).	+	* Ultimate limit state (ULS).
		+	* Serviceability limit state (SLS).

	= Ultimate limit state (ULS) =		= Ultimate limit state (ULS) =

−	~~The ultimate~~ limit state is ~~the~~ design for the safety of a structure and its users by limiting the stress that materials experience~~. In order to comply with engineering demands for strength and stability under design loads, ULS must be fulfilled as an established condition~~.	+	Ultimate limit state (ULS) is design for the safety of a structure and its users by limiting the stress that materials experience.

−	The ~~ULS~~ is a purely elastic condition, usually located at the upper part of its elastic zone (approximately 15% lower than the elastic limit). This is in contrast to the ultimate state (US) which involves excessive deformations approaching structural collapse, and is located deeply within the plastic zone.	+	The ultimate limit state is a purely elastic condition, usually located at the upper part of its elastic zone (approximately 15% lower than the elastic limit). This is in contrast to the ultimate state (US) which involves excessive deformations approaching structural collapse, and is located deeply within the plastic zone.

	If all factored bending, shear and tensile or compressive stresses are below the calculated resistances then a structure will satisfy the ULS criterion. Safety and reliability can be assumed as long as this criterion is fulfilled, since the structure will behave in the same way under repetitive loadings.		If all factored bending, shear and tensile or compressive stresses are below the calculated resistances then a structure will satisfy the ULS criterion. Safety and reliability can be assumed as long as this criterion is fulfilled, since the structure will behave in the same way under repetitive loadings.
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	= Serviceability limit state (SLS) =		= Serviceability limit state (SLS) =

−	~~The servicability~~ limit state is ~~the~~ design to ensure a structure is comfortable and useable. This includes vibrations and deflections (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions.	+	Servicability limit state (SLS) is design to ensure a structure is comfortable and useable. This includes vibrations and deflections (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions. It might also involve limits to non-structural issues such as acoustics and heat transmission.

−	~~It might also involve limits~~ to ~~non~~-~~structural issues such~~ as ~~acoustics and heat transmission~~.	+	Servicability limit state requirements tend to be less rigid than strength-based limit states as the safety of the structure is not in question.

−	~~SLS requirements tend to be less rigid than strength-based limit states as the safety of the structure is not in question.~~ A structure must remain functional for its intended use subject to routine loading in order to satisfy SLS criterion.	+	A structure must remain functional for its intended use subject to routine loading in order to satisfy SLS criterion.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Adaptive structures.		* Adaptive structures.

Editor: Reverted edits by 88.151.154.244 (talk) to last revision by Designing Buildings

2021-11-10T11:50:24Z

Reverted edits by 88.151.154.244 (talk) to last revision by Designing Buildings

← Older revision		Revision as of 11:50, 10 November 2021
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	= Serviceability limit state (SLS) =		= Serviceability limit state (SLS) =

−	The ~~serviceability~~ limit state is the design to ensure a structure is comfortable and useable. This includes vibrations and ~~defecations~~ (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions.	+	The servicability limit state is the design to ensure a structure is comfortable and useable. This includes vibrations and deflections (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions.

	It might also involve limits to non-structural issues such as acoustics and heat transmission.		It might also involve limits to non-structural issues such as acoustics and heat transmission.

88.151.154.244 at 11:09, 10 November 2021

2021-11-10T11:09:23Z

← Older revision		Revision as of 11:09, 10 November 2021
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	= Serviceability limit state (SLS) =		= Serviceability limit state (SLS) =

−	The ~~servicability~~ limit state is the design to ensure a structure is comfortable and useable. This includes vibrations and ~~deflections~~ (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions.	+	The serviceability limit state is the design to ensure a structure is comfortable and useable. This includes vibrations and defecations (movements), as well as cracking and durability. These are the conditions that are not strength-based but still may render the structure unsuitable for its intended use, for example, it may cause occupant discomfort under routine conditions.

	It might also involve limits to non-structural issues such as acoustics and heat transmission.		It might also involve limits to non-structural issues such as acoustics and heat transmission.

Designing Buildings at 07:49, 4 September 2020

2020-09-04T07:49:15Z

← Older revision		Revision as of 07:49, 4 September 2020
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	* Handbook of structural steelwork, Eurocode Edition, 2013.		* Handbook of structural steelwork, Eurocode Edition, 2013.

−	[[Category:~~Standards_/_measurements~~]] [[Category:~~DCN_Standard~~]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]] [[Category:Design]]

175.136.185.175 at 12:38, 27 May 2020

2020-05-27T12:38:29Z

← Older revision		Revision as of 12:38, 27 May 2020
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	= Introduction =		= Introduction =

−	Limit state design (~~USD~~) refers to a structural engineering design method.	+	Limit state design (LSD) refers to a structural engineering design method.

	A degree of loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on. Limit states are conditions of potential failure.		A degree of loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on. Limit states are conditions of potential failure.
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	* Handbook of structural steelwork, Eurocode Edition, 2013.		* Handbook of structural steelwork, Eurocode Edition, 2013.

−	[[Category:Standards_/_measurements]] [[Category:Design]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]] [[Category:Design]]

175.136.185.175 at 12:38, 27 May 2020

2020-05-27T12:38:07Z

← Older revision		Revision as of 12:38, 27 May 2020
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	= Introduction =		= Introduction =

−	Limit state design (~~LSD~~) refers to a structural engineering design method.	+	Limit state design (USD) refers to a structural engineering design method.

	A degree of loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on. Limit states are conditions of potential failure.		A degree of loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on. Limit states are conditions of potential failure.

Designing Buildings at 08:32, 22 December 2019

2019-12-22T08:32:42Z

← Older revision		Revision as of 08:32, 22 December 2019
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	If all factored bending, shear and tensile or compressive stresses are below the calculated resistances then a structure will satisfy the ULS criterion. Safety and reliability can be assumed as long as this criterion is fulfilled, since the structure will behave in the same way under repetitive loadings.		If all factored bending, shear and tensile or compressive stresses are below the calculated resistances then a structure will satisfy the ULS criterion. Safety and reliability can be assumed as long as this criterion is fulfilled, since the structure will behave in the same way under repetitive loadings.
		+
		+	BS EN 1990 Eurocode – 'Basis of structural design' describes four ultimate limit states:
		+
		+	* EQU: Loss of static equilibrium of the structure.
		+	* STR: Internal failure or excessive deformation of the structure.
		+	* GEO: Failure or excessive deformation of the ground.
		+	* FAT: Fatigue failure of the structure.

	= Serviceability limit state (SLS) =		= Serviceability limit state (SLS) =
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	SLS requirements tend to be less rigid than strength-based limit states as the safety of the structure is not in question. A structure must remain functional for its intended use subject to routine loading in order to satisfy SLS criterion.		SLS requirements tend to be less rigid than strength-based limit states as the safety of the structure is not in question. A structure must remain functional for its intended use subject to routine loading in order to satisfy SLS criterion.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Adaptive structures.		* Adaptive structures.
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	* Types of structural load.		* Types of structural load.

−	=== External resources ===	+	= External resources =

	* BGStructural Engineering - [http://www.bgstructuralengineering.com/BGDesign/BGDesign03.htm LSD]		* BGStructural Engineering - [http://www.bgstructuralengineering.com/BGDesign/BGDesign03.htm LSD]
		+	* Handbook of structural steelwork, Eurocode Edition, 2013.

	[[Category:Standards_/_measurements]] [[Category:Design]]		[[Category:Standards_/_measurements]] [[Category:Design]]

Designing Buildings: Reverted edits by 132.154.108.43 (talk) to last revision by Editor

2019-11-06T07:48:50Z

Reverted edits by 132.154.108.43 (talk) to last revision by Editor

← Older revision		Revision as of 07:48, 6 November 2019
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−	= ~~Sabh bhakchodi hai~~ =	+	= Introduction =

	Limit state design (LSD) refers to a structural engineering design method.		Limit state design (LSD) refers to a structural engineering design method.

132.154.108.43 at 05:14, 6 November 2019

2019-11-06T05:14:23Z

← Older revision		Revision as of 05:14, 6 November 2019
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−	= ~~Introduction~~ =	+	= Sabh bhakchodi hai =

	Limit state design (LSD) refers to a structural engineering design method.		Limit state design (LSD) refers to a structural engineering design method.