Portal frame - Revision history

194.83.132.3 at 14:21, 24 January 2022

2022-01-24T14:21:22Z

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at 14:20, 24 January 2022

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194.83.132.3 at 14:17, 24 January 2022

2022-01-24T14:17:22Z

← Older revision		Revision as of 14:17, 24 January 2022
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	They were originally used because of their structural efficiency, meaning that large spaces could be enclosed with little use of materials and for a low cost. Tata Steel suggest that today, 50% of constructional steel used in the UK is in portal frame construction.		They were originally used because of their structural efficiency, meaning that large spaces could be enclosed with little use of materials and for a low cost. Tata Steel suggest that today, 50% of constructional steel used in the UK is in portal frame construction.

−	(Ref. [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].)	+	(Ref. [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].) Doyle is cool

	[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]		[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]

Editor: Reverted edits by 212.219.44.130 (talk) to last revision by Designing Buildings

2021-10-21T13:18:25Z

Reverted edits by 212.219.44.130 (talk) to last revision by Designing Buildings

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Designing Buildings at 06:21, 1 September 2020

2020-09-01T06:21:27Z

← Older revision		Revision as of 06:21, 1 September 2020
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	* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].		* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].

−	[[Category:~~Products_/_components~~]] [[Category:DCN_Product_Knowledge]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Products_/_components]]

Editor: Reverted edits by 194.80.114.3 (talk) to last revision by Editor

2020-01-27T15:27:08Z

Reverted edits by 194.80.114.3 (talk) to last revision by Editor

← Older revision		Revision as of 15:27, 27 January 2020
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		+	Portal frames were first developed during the Second World War and became popular in the 1960s. They are now commonly used to create wide-span [[Principles_of_enclosure\|enclosures]] such as; warehouses, agricultural buildings, hangars, entertainment and sport venues, factories, large retail units, and so on, where a clear space is required uninterrupted by intermediary [[Column\|columns]].
		+
		+	They were originally used because of their structural efficiency, meaning that large spaces could be enclosed with little use of materials and for a low cost. Tata Steel suggest that today, 50% of constructional steel used in the UK is in portal frame construction.
		+
		+	(Ref. [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].)
		+
	[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]		[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]

−	= ~~SYM~~ =	+	Portal frames are a type of [[Steel_frame\|structural frame]], that, in their simplest form, are characterised by a beam (or [[Rafter\|rafter]]) supported at either end by [[Column\|columns]], however, the joints between the beam and [[Column\|columns]] are 'rigid' so that the bending moment in the beam is transferred to the [[Column\|columns]]. This means that the beam can be reduced in sectional size and can span large distances. Typically, the joint between the beam and the columns is made 'rigid' by the addition of a haunch, bracket, or by a deepening of the section at the joints
		+
		+	Portal frames are generally fabricated from steel, reinforced precast concrete, or laminated timber sometimes referred to as 'glulam'.
		+
		+	Where a [[Pitched_roof\|pitch]] is required, portal frames can have a [[Mono_pitch_roof\|mono pitch]], or can have a double pitch with a rigid joint at the apex. Other forms include; tied portal frames, propped portal frames and multi-span portal frames which can cover very large areas. Where the portal frame includes a pitch, the wider the span of the frame, the higher the apex.
		+
		+	To reduce the overall height, a curved rafter might be adopted, or a mansard form. This can also help with water runoff, which can be significant on large roofs. A curved, or mansard form increases the pitch of the roof towards the eaves, where the runoff is likely to be at its greatest.
		+
		+	Generally, a building structure will be formed by a series of parallel portal frames running down the length of the buildings, typically 6 - 8 m apart. A secondary framework of purlins fixed to the [[Rafter\|rafters]] and rails fixed to the columns provides support for cladding. Portal frame structures are often clad with prefabricated [[Metal_composite_panels\|composite metal panels]], incorporating insulation. Masonry cladding may be provided at low level to give greater resilience and security.
		+
		+	They are a deceptively simple structural form, but care must be taken, particularly in the design of joints to ensure that appropriate restraint is provided to prevent buckling. [[Braced_frame_structures\|Bracing]] is also required to give the row of parallel frames lateral stability, and this may be provided in an end bay or intermediary bay between the frames.
		+
		+	Portal frames can be a simple and rapid form of structure to erect, creating a wide, clear-span, weather-proof enclosure at low cost, with little material. They tend to be lightweight and can be fabricated off-site, then bolted to a substructure. The portal frames themselves may be left exposed to the internal space, and if carefully designed can be very beautiful.
		+
		+	= Related articles on Designing Buildings Wiki =
		+
		+	* Arches.
		+	* Barrel vault.
		+	* Braced frame.
		+	* Concrete.
		+	* Conoid shell.
		+	* Folded plate construction.
		+	* Hyperbolic paraboloid.
		+	* Long span roof.
		+	* Pendentive dome.
		+	* Rafter.
		+	* Shell roof.
		+	* Skeleton frame.
		+	* Steel frame.
		+	* Structural engineer.
		+	* Structural steelwork.
		+	* Superstructure.
		+	* Substructure.
		+	* Timber.
		+	* Truss.
		+	* Types of frame.

	= External references =		= External references =
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	* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].		* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].

−	[[Category:Products_/_components]]	+	[[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

194.80.114.3: Replaced content with "link=File:Portal_frame.jpg = SYM = = External references = * [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Fram..."

2020-01-27T13:30:03Z

Replaced content with "link=File:Portal_frame.jpg = SYM = = External references = * [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Fram..."

← Older revision		Revision as of 13:30, 27 January 2020
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−	Portal frames were first developed during the Second World War and became popular in the 1960s. They are now commonly used to create wide-span [[Principles_of_enclosure\|enclosures]] such as; warehouses, agricultural buildings, hangars, entertainment and sport venues, factories, large retail units, and so on, where a clear space is required uninterrupted by intermediary [[Column\|columns]].
−
−	They were originally used because of their structural efficiency, meaning that large spaces could be enclosed with little use of materials and for a low cost. Tata Steel suggest that today, 50% of constructional steel used in the UK is in portal frame construction.
−
−	~~(Ref. [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].)~~
−
	[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]		[[File:Portal_frame.jpg\|link=File:Portal_frame.jpg]]

−	Portal frames are a type of [[Steel_frame\|structural frame]], that, in their simplest form, are characterised by a beam (or [[Rafter\|rafter]]) supported at either end by [[Column\|columns]], however, the joints between the beam and [[Column\|columns]] are 'rigid' so that the bending moment in the beam is transferred to the [[Column\|columns]]. This means that the beam can be reduced in sectional size and can span large distances. Typically, the joint between the beam and the columns is made 'rigid' by the addition of a haunch, bracket, or by a deepening of the section at the joints	+	= SYM =
−		+
−	~~Portal frames are generally fabricated from steel, reinforced precast concrete, or laminated timber sometimes referred to as 'glulam'.~~	+
−		+
−	Where a [[Pitched_roof\|pitch]] is required, portal frames can have a [[Mono_pitch_roof\|mono pitch]], or can have a double pitch with a rigid joint at the apex. Other forms include; tied portal frames, propped portal frames and multi-span portal frames which can cover very large areas. Where the portal frame includes a pitch, the wider the span of the frame, the higher the apex.	+
−		+
−	To reduce the overall height, a curved rafter might be adopted, or a mansard form. This can also help with water runoff, which can be significant on large roofs. A curved, or mansard form increases the pitch of the roof towards the eaves, where the runoff is likely to be at its greatest.	+
−		+
−	Generally, a building structure will be formed by a series of parallel portal frames running down the length of the buildings, typically 6 - 8 m apart. A secondary framework of purlins fixed to the [[Rafter\|rafters]] and rails fixed to the columns provides support for cladding. Portal frame structures are often clad with prefabricated [[Metal_composite_panels\|composite metal panels]], incorporating insulation. Masonry cladding may be provided at low level to give greater resilience and security.	+
−		+
−	They are a deceptively simple structural form, but care must be taken, particularly in the design of joints to ensure that appropriate restraint is provided to prevent buckling. [[Braced_frame_structures\|Bracing]] is also required to give the row of parallel frames lateral stability, and this may be provided in an end bay or intermediary bay between the frames.	+
−		+
−	Portal frames can be a simple and rapid form of structure to erect, creating a wide, clear-span, weather-proof enclosure at low cost, with little material. They tend to be lightweight and can be fabricated off-site, then bolted to a substructure. The portal frames themselves may be left exposed to the internal space, and if carefully designed can be very beautiful.	+
−		+
−	= ~~Related articles on Designing Buildings Wiki~~ =	+
−		+
−	* Arches.	+
−	* Barrel vault.	+
−	* Braced frame.	+
−	* Concrete.	+
−	* Conoid shell.	+
−	* Folded plate construction.	+
−	* Hyperbolic paraboloid.	+
−	* Long span roof.	+
−	* Pendentive dome.	+
−	* Rafter.	+
−	* Shell roof.	+
−	* Skeleton frame.	+
−	* Steel frame.	+
−	* Structural engineer.	+
−	* Structural steelwork.	+
−	* Superstructure.	+
−	* Substructure.	+
−	* Timber.	+
−	* Truss.	+
−	* Types of frame.	+

	= External references =		= External references =

Editor at 16:21, 23 September 2019

2019-09-23T16:21:05Z

← Older revision		Revision as of 16:21, 23 September 2019
Line 21:		Line 21:
	Portal frames can be a simple and rapid form of structure to erect, creating a wide, clear-span, weather-proof enclosure at low cost, with little material. They tend to be lightweight and can be fabricated off-site, then bolted to a substructure. The portal frames themselves may be left exposed to the internal space, and if carefully designed can be very beautiful.		Portal frames can be a simple and rapid form of structure to erect, creating a wide, clear-span, weather-proof enclosure at low cost, with little material. They tend to be lightweight and can be fabricated off-site, then bolted to a substructure. The portal frames themselves may be left exposed to the internal space, and if carefully designed can be very beautiful.

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

	* Arches.		* Arches.
Line 46:		Line 44:
	* Types of frame.		* Types of frame.

−	=== External references~~. ==~~=	+	= External references =

	* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].		* [http://www.steelconstruction.info/Portal_frames SteelConstruction.info, Portal Frames].

	[[Category:Products_/_components]]		[[Category:Products_/_components]]