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

3

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

6

WSP Acoustics – Environmental and industrial noise

Noise mapping

with CADNA and

SoundPlan

software

At a glance

7

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

8

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

9

Room Acoustics

Room acoustic design of

cinemas

Room acoustic

design in public

areas

At a glance

10

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

12

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

15

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

31

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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At a glance

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Thank you!!For your attention

Klas.hagberg@wsp.comTwitter: @klashagb