Vibrations in buildings - Revision history

Designing Buildings at 08:55, 22 November 2022

2022-11-22T08:55:26Z

← Older revision		Revision as of 08:55, 22 November 2022
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	* Impact noise.		* Impact noise.
	* Noise nuisance.		* Noise nuisance.
		+	* Peak particle velocity.
	* Resonant column method.		* Resonant column method.
	* Steel construction floor vibration.		* Steel construction floor vibration.

Designing Buildings at 08:53, 2 November 2022

2022-11-02T08:53:49Z

← Older revision		Revision as of 08:53, 2 November 2022
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	NB A vibration dose value is defined in BS6472-1(2008) as a relationship that yields a consistent assessment of vibration which correlates well with subjective response. It is used to estimate the probability of adverse comment which might be expected from human beings experiencing vibration in buildings. Consideration is given to the time of day and use made of occupied space in buildings, whether residential, office or workshop.		NB A vibration dose value is defined in BS6472-1(2008) as a relationship that yields a consistent assessment of vibration which correlates well with subjective response. It is used to estimate the probability of adverse comment which might be expected from human beings experiencing vibration in buildings. Consideration is given to the time of day and use made of occupied space in buildings, whether residential, office or workshop.

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

−	~~=== Related articles on Designing Buildings Wiki ===~~	+	* Ground-borne vibration.
−		+	* Impact noise.
−	* Braced frame structures.	+	* Noise nuisance.
−	* Concept structural design of buildings.	+
−	* ~~Detailed structural design~~.	+
−	* ~~Elements of structure in buildings~~.	+
−	* ~~Lateral loads~~.	+
	* Resonant column method.		* Resonant column method.
	* Steel construction floor vibration.		* Steel construction floor vibration.
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	* Structural vibration.		* Structural vibration.
	* The design of temporary structures and wind adjacent to tall buildings.		* The design of temporary structures and wind adjacent to tall buildings.
−	* Types of structural load.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Construction_techniques]] [[Category:Design]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Construction_techniques]] [[Category:Design]]

Designing Buildings at 09:47, 24 September 2020

2020-09-24T09:47:53Z

← Older revision		Revision as of 09:47, 24 September 2020
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	* Types of structural load.		* Types of structural load.

−	[[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Construction_techniques]] [[Category:Design]]

Designing Buildings at 13:55, 24 January 2019

2019-01-24T13:55:11Z

← Older revision		Revision as of 13:55, 24 January 2019
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	Vibrations are sometimes dealt with most effectively at source. For instance, machinery-induced vibrations can be minimised by using isolating mounts or motion-arresting pads. An inexpensive approach is to increase the floor loading within the building. Weight can be placed under a raised floor to minimise movement from foot traffic for instance, and dissipate vibration.		Vibrations are sometimes dealt with most effectively at source. For instance, machinery-induced vibrations can be minimised by using isolating mounts or motion-arresting pads. An inexpensive approach is to increase the floor loading within the building. Weight can be placed under a raised floor to minimise movement from foot traffic for instance, and dissipate vibration.
		+
		+	NB A vibration dose value is defined in BS6472-1(2008) as a relationship that yields a consistent assessment of vibration which correlates well with subjective response. It is used to estimate the probability of adverse comment which might be expected from human beings experiencing vibration in buildings. Consideration is given to the time of day and use made of occupied space in buildings, whether residential, office or workshop.

	= Find out more =		= Find out more =

Designing Buildings: Reverted edits by 86.174.240.188 (talk) to last revision by Editor

2018-12-17T07:42:04Z

Reverted edits by 86.174.240.188 (talk) to last revision by Editor

← Older revision		Revision as of 07:42, 17 December 2018
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	* Types of structural load.		* Types of structural load.

−	~~[[Category:Articles_needing_more_work]]~~ [[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:Construction_techniques]] [[Category:Design]]

86.174.240.188 at 18:08, 16 December 2018

2018-12-16T18:08:03Z

← Older revision		Revision as of 18:08, 16 December 2018
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	* Types of structural load.		* Types of structural load.

−	[[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:Articles_needing_more_work]] [[Category:Construction_techniques]] [[Category:Design]]

Editor at 12:19, 4 May 2018

2018-05-04T12:19:33Z

← Older revision		Revision as of 12:19, 4 May 2018
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	* Detailed structural design.		* Detailed structural design.
	* Elements of structure in buildings.		* Elements of structure in buildings.
		+	* Lateral loads.
	* Resonant column method.		* Resonant column method.
	* Steel construction floor vibration.		* Steel construction floor vibration.

Designing Buildings: moved Vibrations to Vibrations in buildings

2017-10-20T16:31:50Z

moved Vibrations to Vibrations in buildings

← Older revision

Revision as of 16:31, 20 October 2017

Designing Buildings at 16:31, 20 October 2017

2017-10-20T16:31:30Z

← Older revision		Revision as of 16:31, 20 October 2017
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	* Construction activities, e.g. demolition works.		* Construction activities, e.g. demolition works.
	* Wind buffeting.		* Wind buffeting.
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−

	As even very low amplitudes of vibration can be perceived by occupants, building designers must consider how to avoid nuisance being caused through vibration. They should also consider the structural strength to ensure it is enough to resist the peak dynamic forces acting on it. Structural members and their connections must be designed to resist such forces, and connections must be designed to ensure that fatigue does not occur due to repeated cyclic loading.		As even very low amplitudes of vibration can be perceived by occupants, building designers must consider how to avoid nuisance being caused through vibration. They should also consider the structural strength to ensure it is enough to resist the peak dynamic forces acting on it. Structural members and their connections must be designed to resist such forces, and connections must be designed to ensure that fatigue does not occur due to repeated cyclic loading.

Designing Buildings at 16:31, 20 October 2017

2017-10-20T16:31:11Z

← Older revision		Revision as of 16:31, 20 October 2017
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	The length of a wave vibration is measured from the beginning of one point on a wave to the same point on the next wave and is known as the frequency. This is expressed as Hertz (Hz). The height of a wave vibration is measured from the centre line and is known as the amplitude. This is expressed in metres. The larger the amplitude, the slower the wave is as it moves from peak to trough (oscillation).		The length of a wave vibration is measured from the beginning of one point on a wave to the same point on the next wave and is known as the frequency. This is expressed as Hertz (Hz). The height of a wave vibration is measured from the centre line and is known as the amplitude. This is expressed in metres. The larger the amplitude, the slower the wave is as it moves from peak to trough (oscillation).

−	The consequences of building vibrations ~~can range from presenting a nuisance to occupants, disturbing sensitive equipment, causing fixture and fittings damage, or even damaging the structural integrity. The consequences will be~~ determined by the source of the motion, its duration, and the building’s ~~design~~ and layout.	+	The consequences of building vibrations are determined by the source of the motion, its duration, and the building’s construction and layout. They may include:

−	Vibrations that affect buildings can be produced by a variety of sources and most are felt through the floor system. ~~Vibration~~ can originate directly in the floor and then travel out from the source~~. Or it~~ can be propagated through ~~the~~ building members from other ~~forces~~ that originate in the ground or outside the building.	+	* Presenting a nuisance to occupants.
		+	* Disturbing sensitive equipment.
		+	* Causing fixture and fittings damage
		+	* Damaging structural integrity.
		+	* The consequences will be .
		+
		+	Vibrations that affect buildings can be produced by a variety of sources and most are felt through the floor system. Vibrations can originate directly in the floor and then travel out from the source, or can be propagated through building members from other sorces that originate in the ground or outside the building.
		+
		+	Internal sources include:
		+
		+	* HVAC equipment.
		+	* Lift and conveyance systems.
		+	* Fluid pumping equipment.
		+	* Human activity, e.g. walking, dancing, aerobic exercises, etc.

	External sources include:		External sources include:
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	* Wind buffeting.		* Wind buffeting.

−	~~Internal sources include:~~

−	* HVAC equipment.
−	* Lift and conveyance systems.
−	* Fluid pumping equipment.
−	* Human activity, e.g. walking, dancing, aerobic exercises, etc.

−	As even very low amplitudes of vibration can be perceived by occupants, building designers must consider how to avoid nuisance being caused through vibration. They should also consider the structural strength to ensure it is enough to ~~be capable of resisting~~ the peak dynamic forces acting on it. Structural members and their connections must be designed to resist ~~higher loads. In addition~~, connections must be designed to ensure that fatigue does not occur due ~~to being subject~~ to repeated cyclic loading ~~that exceeds stress limits~~.	+	As even very low amplitudes of vibration can be perceived by occupants, building designers must consider how to avoid nuisance being caused through vibration. They should also consider the structural strength to ensure it is enough to resist the peak dynamic forces acting on it. Structural members and their connections must be designed to resist such forces, and connections must be designed to ensure that fatigue does not occur due to repeated cyclic loading.

−	Frequency and amplitude are taken into building designers’ calculations to determine where extra stiffness is required to dampen the vibration. Damping refers to the minimising of amplitude in a vibration or ~~the~~ mechanical energy loss~~. It can originate from friction at member connections, dead load weight on the floor (e.g. furniture), and other methods of dissipating the vibration~~.	+	Frequency and amplitude are taken into building designers’ calculations to determine where extra stiffness is required to dampen the vibration. Damping refers to the minimising of amplitude in a vibration or mechanical energy loss.

	Anticipated usage of the floors is a critical consideration that should inform the concept design. Similarly, if a building is being constructed near a busy road or above a subway system, the foundations should be carefully detailed to accommodate the likely vibrations.		Anticipated usage of the floors is a critical consideration that should inform the concept design. Similarly, if a building is being constructed near a busy road or above a subway system, the foundations should be carefully detailed to accommodate the likely vibrations.
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	During the initial design of a building, the likelihood of perceptible vibration in sensitive spaces should be carefully assessed. This is particularly important for buildings that are designed with an unusual geometry or complicated structural systems. As the complexity of a structure increases, the impact of vibration becomes more difficult to accurately predict and effectively minimise.		During the initial design of a building, the likelihood of perceptible vibration in sensitive spaces should be carefully assessed. This is particularly important for buildings that are designed with an unusual geometry or complicated structural systems. As the complexity of a structure increases, the impact of vibration becomes more difficult to accurately predict and effectively minimise.

−	~~Finite element analysis techniques can be used in conjunction with physical testing to ensure that the vibration isolation is most efficient at the areas of the building where it is most critical.~~	+	It is important that building designers properly consider levels of acceptable vibration at the concept design stage as it can be very difficult, and costly, to modify an existing floor to reduce its susceptibility to vibration. Remediation may require major changes to the mass, stiffness or damping of the floor system.
−		+
−	It is important that building designers properly consider levels of acceptable vibration at the concept design stage as it is very difficult, and costly, to modify an existing floor to reduce its susceptibility. ~~Often the only solution will be to undertake~~ major changes to the mass, stiffness or damping of the floor system ~~once it is in place.~~	+
−		+
−	One method of tackling vibration later on is to add damping arms to the underside of the structure which uses friction to dissipate vibration. Partitions can also be added, although this will affect the amount of useable space inside the building.	+

−	~~It can often be the case, that vibrations can be~~ dealt with most effectively at source. For instance, machinery-induced vibrations can be minimised by using isolating mounts or motion-arresting pads. An inexpensive approach is to increase the floor loading within the building. Weight can be placed under a raised floor to minimise movement from foot traffic for instance, and dissipate vibration.	+	Vibrations are sometimes dealt with most effectively at source. For instance, machinery-induced vibrations can be minimised by using isolating mounts or motion-arresting pads. An inexpensive approach is to increase the floor loading within the building. Weight can be placed under a raised floor to minimise movement from foot traffic for instance, and dissipate vibration.

	= Find out more =		= Find out more =