Lund University Klas Hagberg. Maj 2017

Transcription

1 Lund University Klas Hagberg Maj 2017

2 Agenda INTRO WSP Business Areas Regulations Building Acoustic in general design Various constructions Failure on site Other

3 WSP Acoustics 70 consultants in the Swedish business Approximately 200 consultants in the global business 3 Offices in Sweden, Finland, UK, USA, Dubai, Australia, Canada, South Africa and some certain persons in other countries

4 WSP Acoustics business areas 4 Building acoustics Environmental noise mapping Industrial noise mapping Interior noise Room acoustics Electro acoustics Vibrations

5 WSP Acoustics Building Acoustics 5

6 WSP Acoustics Environmental and industrial noise 6 Noise mapping with CADNA and SoundPlan software

7 WSP Acoustics interior noise Measurements according to ISO and ISO 354 and evaluation according to ISO and SS Se 7

8 Electro Acoustics Development of new telephone models for Sony Mobile. Not too much any more 8 Speech alarm systems requirements and RASTI measurements

9 Room Acoustics Room acoustic design of cinemas 9 Room acoustic design in public areas

10 WSP Acoustics Virtual Reality Model 10 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

11 Vibrations 11 Vibration surveillance Risk analysis Measurements

12 Building Acoustics 12 Only BA itself is a large topic Design Measurements Product knowledge Various structures and its behaviour Regulations etc

13 Building Acoustics Några viktiga budskap Akustik och vibrationer bestämmer dimensioner hos en konstruktion 13 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)

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15 Ljudkonsultens rapporter 15 Reduktionstal tersband Frekvenser decibel Beräkningar Mätningar akustiker 15

16 Building Acoustics Regulations SS and SS Class A Class B BBR Class D National building code (in Sweden BBR, BFS 1993:57 including revisions until 2017) 16 To be applied by local authorities, using certain application guidelines Optional classes for commissioner of building projects to achieve especially good sound climate To be applied in certain exceptional rebuilding projects after specific reconsideration

17 Building Acoustics - Regulations Commissioner of building projects BBR, SS and SS sound class technical requirements 17 Controller of building projects SS and SS Catalogue methods concerning calculations and measurements Project manager SS-EN Calculation methods SS and SS 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

18 Sound insulation 18 Sound insulation / sound reduction index, R Should be as high as possible Impact sound level, L n Should be as low as possible

19 Sound reduction index The 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. 19 DnT=Lp1-Lp2+10*log(T/T 0 ) 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

20 Weighted values SS-EN ISO Different measures R w R w D ntw D ntw +C R A 20 R A R A,tr R w+c R w+c R w+c tr R w+c tr, R w+c tr, etc. A political way to meet an agreement

21 Lij db At a glance Spectrum adaptation terms in diagram Spektrum för att beräkna C och Ctr ( Hz) Spektrum spektrum Frekvens, Hz

22 Same value, Rw different shapes reduktionstal R [db] betong Rw 58 db D 120/ M95 Rw 58 db frekvens [Hz]

23 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 23 Example: Gypsum wall DD 70/ 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!

24 Impact sound level, Ln The impact sound level is measured / calculated in each single 1/3 octave band level from Hz : Ln=Lp+10*log (A/10) or 24 LnT=Lp+10*log (T/0,5) Lp = sound level in the receiving room A = Sound absorption area in the receiving room T = Reverberation time in the receiving room

25 Impact sound level SS-EN ISO Different measures L n L n,w L n,w +C I 25 L n,w +C I, L nt,w L nt,w +C I,

26 Impact sound The same is valid for impact sound L nw, wood L nw, concrete 26 Even if the single numbers are identical

27 Impact Sound Same value but different shapes Lnw =58 db Lnw+CI, = 62 db Lnw =58 db Lnw+CI, = 57 db 27

28 EN BASTIAN 28

29 Building acoustics How does the sound appear in various structures? 29 Sound insulation Room acoustics Sound propagation from installations Sound levels from traffic / facade sound insulation

30 Typical structures Prefabricated massive concrete Concrete casted in situ 30 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..

31 Building Acoustics - Dwellings 31 Chabo 479 dwellings for students in Gothenburg close to Chalmers University of technology Designed to meet the new minimum requirements in Sweden

32 HDF + upper floor + light weight walls HD/F 120/19, 330 kg minimum DD 70/ M Measurement results?

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34 Emilsborg 34

35 Prefabricated massive concrete Plattbärlag / HD/F eller likvärdigt Concrete 200 mm 35

36 Emilsborg R w+c = 60 db 36

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38 Juvelkvarnen 38

39 Juvelkvarnen Reduktionstal ( Hz) Ref ( Hz)

40 Juvelkvarnen 40

41 Building Acoustics - Dwellings 41

42 Tested products 42

43 Building Acoustics - Dwellings Winner of The building of the year 2006! Vavskedsgatan in Lunden, Gothenburg 43 Construction: Concrete walls and floor structure built up by HD/F 120/27 (365 kg/m 2 ) + GIHA sound floor Designed to meet sound class B, 4 db higher than minimum requirements

44 Different Wooden structure systems 44 Volume elements Derome / Plusshus Lindbäcks Moelven Etc etc Casette systems Masonite Trä8 (Moelven) Etc etc CLT Martinsons StoraEnso

45 Materials and Systems Joist assemblies a small sample of all available options CLT assemblies a small sample of all available options

46 Masonite Flexible Building system (MFB) 46

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48 CLT Wood Example Example

49 Summering 49 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...

50 Thank you!! For your attention 50