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Maj 2017 Lund University 2017-12-08 Klas Hagberg
Maj 2017
Lund University 2017-12-08Klas Hagberg
Agenda
— INTRO – WSP
— Business Areas
— Regulations
— Building Acoustic in general – design
— Various constructions
— Failure on site
— Other
WSP Acoustics
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70 consultants in the Swedish business
Approximately 200 consultants in the global
business
Offices in Sweden, Finland, UK, USA, Dubai,
Australia, Canada, South Africa and some
certain persons in other countries
At a glance
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WSP Acoustics – business areas
—Building acoustics— Environmental noise mapping— Industrial noise mapping— Interior noise—Room acoustics — Electro acoustics—Vibrations
At a glance
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WSP Acoustics – Building Acoustics
At a glance
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WSP Acoustics – Environmental and industrial noise
Noise mapping
with CADNA and
SoundPlan
software
At a glance
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Measurements according to
ISO 10053 and ISO 354
and evaluation according to
ISO 11654 and SS 25269
Se www.acousticfacts.com
WSP Acoustics – interior noise
At a glance
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Electro Acoustics
Development of new
telephone models for
Sony Mobile……. Not too
much any more
Speech alarm
systems –
requirements and
RASTI
measurements
At a glance
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Room Acoustics
Room acoustic design of
cinemas
Room acoustic
design in public
areas
At a glance
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WSP Acoustics Virtual Reality Model
Creates real room models,
incl. auralization. A computer
model show how different
linings on walls and ceilings
appear acoustically in a
room.
Architects and an
acousticians can easily
cooperate in the design of
rooms creating desired
sound properties
Almedahls textiles
At a glance
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Vibrations
Vibration surveillance
Risk analysis
Measurements
At a glance
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Building Acoustics
—Only BA itself is a large topic—Design—Measurements—Product knowledge —Various structures and its behaviour—Regulations—etc
At a glance
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— Några viktiga budskap
— Akustik och vibrationer bestämmer dimensioner hos en konstruktion
—Varför är det 250 mm betong i ett bjälklag?—Varför behövs 200 mm betong i väggarna?—Varför är det ofta HD/F 265 mm?— Etc etc
—Med dessa dimensioner klarar man normalt ljudklass B i Sverige
— Varför blir ett träbjälklag 500 mm tjock (eller 400 med viss optimering)?
— Det är oftast akustiken som bestämmer dimensionerna hos byggdelarna i en byggnad och stegljud och vibrationer är mest kritiskt (åtminstone för lätta träbyggander)
Building Acoustics
At a glance
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At a glance
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— Reduktionstal tersband Frekvenser deciBel
— Beräkningar Mätningar akustiker
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Ljudkonsultens rapporter…
At a glance
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Building Acoustics – Regulations
SS 25267 and SS 25268
Class A Class B BBR Class D
National building code (in Sweden BBR, BFS 1993:57 including revisions until 2017)
To be applied by local authorities, using certain application guidelines
To be applied in certain exceptional rebuilding projects after specific reconsideration
Optional classes for commissioner of building projects to achieve especially good sound climate
At a glance
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Building Acoustics - Regulations
Commissioner of building
projects
BBR, SS 25267 and SS 25268 –
sound class technical requirements
Controller of building projects
SS 25267 and SS 25268 Catalogue–methods concerning calculations and measurements
Project manager
SS-EN 12354 Calculation methods
SS 25267 and SS 25268
– Annexes including
project advice
Manufacturer
SS-EN ISO 140 Measurement methods to
secure the acoustical quality of building
products
Contractor
Educating employees, assignments from project
manager – quality plan, internal and external
quality control
At a glance
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Sound insulation
Sound insulation / sound reduction index, R
Should be as high as possible
Impact sound level, Ln
Should be as low as possible
At a glance
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Sound reduction indexThe sound reduction index is measured / calculated for each single 1/3 octave
value according to the formula:
R=Lp1-Lp2+10*log(S/A)
- or the Standardized level diff.
DnT=Lp1-Lp2+10*log(T/T0)
Lp1 = Sound level in the sending room
Lp2 = Sound level in the receiving room
S = separating area
A = sound absorption area in the receiving room
Then ”the weighted sound reduction value” is calculated acc to SS-EN ISO 717-1
At a glance
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Weighted values SS-EN ISO 717-1
Different measures
Rw
R´w
DnTw
DnTw+C50-3150
RA
R´A
RA,tr
R´w+C
R´w+C50-3150
R´w+Ctr
R´w+Ctr,50-3150
R´w+Ctr,50-5000
etc.
A political way to meet an agreement
At a glance
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Spectrum adaptation terms in diagram
-50
-40
-30
-20
-10
0
Lij d
B
Frekvens, Hz
Spektrum för att beräkna C och Ctr (50-3150 Hz)
Spektrum 01
spektrum 02
At a glance
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Same value, Rw – different shapes
reduktionstal R
0
10
20
30
40
50
60
70
80
50 80 125
200
315
500
800
1250
2000
3150
[dB]
frekvens [Hz]
200 betong Rw 58 dB
D 120/95 202 M95
Rw 58 dB
At a glance
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Field value or laboratory value
Depending on how the building products are connected to eachother the final sound insulation might differ a lot from a laboratory measurement
Example:
Gypsum wall DD 70/70 303 M140 - laboratory
Rw=72 dB
In a building with a floor structure of 160 mm concrete
R’w=55 dB SI decreases 17 dB!
Apply an upper floor construction for instance GIHA
R’w=58 dB an improvement 3 dB!
At a glance
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Impact sound level, Ln
The impact sound level is measured / calculated in each single 1/3 octave band level from 50-5000 Hz :
Ln=Lp+10*log (A/10) or
LnT=Lp+10*log (T/0,5)
Lp = sound level in the receiving roomA = Sound absorption area in the receiving roomT = Reverberation time in the receiving room
At a glance
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Impact sound level SS-EN ISO 717-2
Different measures
Ln
L´n,w
L´n,w +CI
L´n,w +CI,50-2500
L´nT,w
L´nT,w +CI,50-2500
At a glance
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—The same is valid for impact sound
L´nw, wood ≠ L´nw, concrete
— Even if the single numbers are identical
Impact sound
At a glance
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Impact Sound – Same value but different shapes
Lnw =58 dB
Lnw+CI,50-2500 = 62 dB
Lnw =58 dB
Lnw+CI,50-2500 = 57 dB
At a glance
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EN 12354 – BASTIAN
At a glance
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Building acoustics
How does the sound appear in various structures?
• Sound insulation
• Room acoustics
• Sound propagation from installations
• Sound levels from traffic / facade sound insulation
At a glance
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Typical structures
— Prefabricated massive concrete
— Concrete casted in situ
— Prefabricated hollow concrete on steel structures with light weight walls
— Prefabricated hollow concrete and massive concrete walls
— Light weight structures (CLT / Joist assemblies)
— Etc etc ……..
At a glance
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Building Acoustics - Dwellings
”Chabo” 479
dwellings for
students in
Gothenburg
close to
Chalmers
University of
technology
Designed to
meet the new
minimum
requirements
in Sweden
At a glance
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HDF + upper floor + light weight walls
HD/F 120/19, 330 kg
minimum
DD 70/70 202 M140
Measurement results?
At a glance
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At a glance
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Emilsborg
At a glance
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Prefabricated massive concretePlattbärlag / HD/F
eller likvärdigt
Concrete 200 mm
At a glance
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Emilsborg
R´w+C50-3150 = 60 dB
At a glance
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At a glance
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Juvelkvarnen
At a glance
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Juvelkvarnen
0
10
20
30
40
50
60
70
80
50 80 125
200
315
500
800
1250
2000
3150
5000
Reduktionstal (50-
5000 Hz)
Ref (100-3150 Hz)
At a glance
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Juvelkvarnen
At a glance
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Building Acoustics - Dwellings
At a glance
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Tested products
At a glance
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Building Acoustics - Dwellings
Winner of ”The building
of the year” 2006!
Vavskedsgatan 10-12 in
Lunden, Gothenburg
Construction:
Concrete walls and floor
structure built up by HD/F
120/27 (365 kg/m2) + GIHA
sound floor
Designed to meet sound class B, 4 dB higher than minimum requirements
At a glance
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Different Wooden structure systems
— Volume elements— Derome / Plusshus— Lindbäcks — Moelven— Etc etc
— Casette systems— Masonite— Trä8 (Moelven)— Etc etc
— CLT— Martinsons— StoraEnso
Materials and Systems
Joist assemblies – a small sample of all available options
CLT assemblies –a small sample of all available options
At a glance
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Masonite Flexible Building system (MFB)
At a glance
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CLT Wood Example
— Example
Summering
— Byggadsakustik är spännande och oerhört utmanande — Byggnadsakustiken dimensionerar en byggnad— Kan arbeta med producerande företag (utveckla nya
lösningar)— Kan arbeta med systemutveckling— Avancerad projektering i förtätningar (projekten blir mer
komplexa)— Och mycket mer..........
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