Application 4 Habitations unifamiliales
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1 APPLICATION 4: MURS SÉPARATEURS ENTRE HABITATIONS UNIFAMILIALES FONDATIONS COMMUNES, CONFORT ACOUSTIQUE SUPÉRIEUR, D nt,w > 62 db 4 cm de laine minérale > 15 kg/m 2 > 15 kg/m 2 HABITATION 1 HABITATION 2 > 62 db flottant flottant MATÉRIAUX mur de séparation 2 x 15 kg/m² 4 cm de laine minérale SonicStrip sols fl ottants nécessaires, également au rez-de-chaussée SonicStrip Longueur du rouleau: 6,25 m / 12,5 m Largeur: / 15 / mm Forme: plane Epaisseur: 1 mm Charge max. par mètre courant: < kn/m SonicStrip placé sous tous les murs. SonicStrip repose sur les dalles de sol du rez-de-chaussée. Dans la dalle de sol: pose d une double armature supplémentaire d un diamètre minimal de 8 mm. Cette solution proposée est soumise aux conditions annexes mentionnées en page 7. Construire avec Silentbrick, c est choisir de construire avec des résultats acoustiques performants. Type de brique Dimensions de fabrication L E H (mm) (mm) (mm) Masse surfacique du mur, mortier inclus (kg/m²) Porotherm Silentbrick > 15 Porotherm Silentbrick > 15 Porotherm Thermobrick > 15 Desimpel Bloc treillis > 15 Desimpel Bloc treillis > Application 4 Habitations unifamiliales
2 WIENERBERGER RAPPORTS D ESSAI ACOUSTIQUE K ij réductions de nœuds d application 4. Dans ce cas le coefficient de réduction est donné pour l émulsion de la double paroi sur un socle de fondation avec une dalle de sol continue. Dans ce cas, un test spécifique n a pas été fait. Mais par contre un test d une dalle de béton a été pris dans les simulations d appartements. Il peut être considéré que ce test sera certainement l approche la plus contraignante à cause d un effet complémentaire de la dissipation qui émergera en cas des dalles de sol en pleine terre. Pour arriver à la détermination DntW ceux-ci doivent être combinés avec les valeurs Rw des parois constructives.
3 CSTC BELGIAN BUILDING RESEARCH INSTITUTE WTCB Offices : B-1932 Sint-Stevens-Woluwe, Lozenberg 7 Tel : (32) Page 1/11 Measurement of the vibration reduction index Kij TEST CASE : CASE 9 Requested by : Wienerberger NV ipv Terca Beerse Contact company : Luc Vasseur BBRI : Test adress : Wienerberger NV Steenbakkersdam 1 in Beerse General informations Test name : K13, K12, K14, K15, K26 Applied standard: Pr EN and 4 Date test : 26/9/7 Date report : 27/9/7 Responsable test : Charlotte Crispin Collaboration : Debby Wuyts Excitation source : Hammer Excitation type : Stationary structure-borne B. Ingelaere Junction informations Junction description : A cross junction composed of a continuous concrete floor and a double brick wall. A resilient joint is inserted between the brick walls and the floor. Wall informations Junction lenght [m] : 4.2 Designation ρ [kg/m³] Width [m] Length [m] Thickness d [m] Edyn [N/m²] μ Wall 1 Floor 2 Wall 3 Wall 4 Wall 5 Floor 6 X Bricks Concrete Bricks Bricks Bricks Concrete Precast concrete E+9 2.6E+1 5.6E+9 5.6E+9 5.6E+9 2.6E+1 2.6E Junction diagram
4 Test equipment Measurement apparatus and tests cells TEST CASE : CASE 9 Page 2/11 Accelerometers : Dytran (sensitivity : mv/g) A real time analyser : 1dB Orchestra (8 channels), 1dB Symphonie (2 channels) Accelerometer calibrator : B&K Type 4294 Excitation source : Hammer Computer + software : dbfa32 v4.8, dbbati32 v4.8 Test cells and mounting description Test adress : Wienerberger NV Steenbakkersdam 1 in Beerse Mounting description : A cross junction composed of a continuous concrete floor and a double brick wall. A resilient joint is inserted between the brick walls and the floor. The resilient joint is a resinbonded rubber with a thickness of.1 m and a width of.14 m. The brick walls are not plastered. The cavity between the brick walls is filled with mineral wool and measures ±.3 m.
5 Ts The structural reverberation time TEST CASE : CASE 9 Page 3/11 Wall 1 Floor 2 Wall 3 Wall 4 Wall 5 Floor 6 X X ηtot The total loss factor Wall 1 Floor 2 Wall 3 Wall 4 Wall 5 Floor 6 X X
6 Kij Kij for the transmission path 1-3 : Result TEST CASE : CASE 9 Direction averaged velocity level difference : Dvij,bid Page 4/11 Test name : K13 Test date : 26/9/7 7 Direction averaged velocity level difference 6 5 Dvij [db] 4 3 Wall 1 Wall 3 S [m²] : ρ' [kg/m²] : B [Nm]: 1.28E E+6 fci [Hz] : n [1/Hz]: Dv13 Dv31 Dv13 bid 1 2 The vibration reduction index : Kij K Kij [db] The vibration reduction index, Kij Single value [db] :
7 Kij Kij for the transmission path 1-2 : Result TEST CASE : CASE 9 Direction averaged velocity level difference : Dvij,bid Page 5/11 Test name : K12 Test date : 26/9/7 5 Direction averaged velocity level difference Dvij [db] 25 2 Wall 1 Floor 2 S [m²] : ρ' [kg/m²] : B [Nm]: 1.28E E+7 fci [Hz] : n [1/Hz]: Dv12 Dv21 Dv12 bid 1 2 The vibration reduction index : Kij K Kij [db] The vibration reduction index, Kij Single value [db] :
8 Kij Kij for the transmission path 1-4 : Result TEST CASE : CASE 9 Direction averaged velocity level difference : Dvij,bid Page 6/11 Test name : K14 Test date : 26/9/7 8 Direction averaged velocity level difference Dvij [db] 4 Wall 1 Wall 4 S [m²] : ρ' [kg/m²] : B [Nm]: 1.28E E+6 fci [Hz] : n [1/Hz]: Dv14 Dv41 Dv14 bid 1 2 The vibration reduction index : Kij K Kij [db] The vibration reduction index, Kij Single value [db] :
9 Kij Kij for the transmission path 1-5 : Result TEST CASE : CASE 9 Direction averaged velocity level difference : Dvij,bid Page 7/11 Test name : K15 Test date : 26/9/7 6 Direction averaged velocity level difference 5 4 Dvij [db] 3 Wall 1 Wall 5 2 S [m²] : ρ' [kg/m²] : B [Nm]: 1.28E E+6 fci [Hz] : n [1/Hz]: Dv15 Dv51 Dv15 bid 1 2 The vibration reduction index : Kij K Kij [db] The vibration reduction index, Kij Single value [db] :
10 Kij Kij for the transmission path 2-6 : Result TEST CASE : CASE 9 Direction averaged velocity level difference : Dvij,bid Page 8/11 Test name : K26 Test date : 26/9/7 8 Direction averaged velocity level difference Dvij [db] 3 2 Floor 2 Floor 6 S [m²] : ρ' [kg/m²] : B [Nm]: 1.49E E+7 fci [Hz] : n [1/Hz]: Dv26 Dv62 Dv26 bid 1 2 The vibration reduction index : Kij K Kij [db] The vibration reduction index, Kij Single value [db] :
11 Annex 1 : MEASUREMENT METHODS Page 9/11 Measurement method to determine the vibration reduction index, Kij General The vibration reduction index K ij expresses, in a way, the attenuation of the power flow through a junction. The draft pren ISO to 4 gives a measurement method to obtain this index in laboratory. The principle of measurement for Kij is based on tis formula : The required quantities are the length of the junction lij [m], the direction averaged level difference [db] and the equivalent absorption lengths ai [m] and aj [m]. All these quantities are obtained by vibration measurements with structure-borne excitation. is obtained from the mean value of the velocity level differences Dv,ij and Dv,ij. Dv,ij (Dv,ji) is the difference between the surface average velocity level of the wall i (j) and the wall j (i) when the wall i (j) is excited at several points. ai and ai are determined according to the measurement of the structural reverberation times Ts,i and Ts,j : S j is the surface area of the wall j [m²]; T sj is the structural reverberation time of the wall i [s]; c is the speed of sound in air [m/s]; f is the current frequency [Hz]; f ref is the reference frequency [f ref = Hz]. Generation of vibration on the source element Multiple hammer hits with approximately the same strength are given over an area of 1 m2 2 m2 during a time period of 3 s. Performance of the measurement On each element (source and receiving plate) three (3) excitation positions and a twelve (12) transducer positions are be used. For each excitation position four (4) different pairs of transducer positions is used on each element. All positions are randomly distributed over the surface of the element, bu not symmetrical. The transducer positions and excitation points shall be arranged using the following minimum distances:,5 m between excitation points and the test element boundaries; 1, m between excitation points and the junction under test; 1, m between excitation points and the associated transducer positions;,25 m between transducer positions and the test element boundaries;,5 m between the individual transducer positions. The maximum distance between transducer positions and the junction under test is 3,5 m. In each frequency band the measured velocity level shall be at least 1 db higher than the background noise level. in any frequency band. If this is not fulfilled, corrections shall be applied as shown in EN ISO The correction value must not exceed 1,3 db. Measurement method to determine the structural reverberation time, Ts T s is the structural reverberation time of a wall [s]. It represents the time that would be required for the velocity or acceleration level in a structure to decrease by 6 db after the structure-borne sound source has stopped. The hammer excitation method is used. Different masses and materials are used for an impact hammer because different material leads to different excitations in frequency bands. Measurement and excitation points At least three excitation points shall be used on the test element. At least three transducer positions shall be used for each excitation point. The transducer positions and the excitation points shall be arranged using the following minimum distances:,5 m between transducer positions and the test element boundaries; 1 m between the excitation point and the associated transducer positions;,5 m between the individual transducer positions. The measurement points shall be randomly distributed over the test element.
12 Annex 2 : Checking the measurement conditions TEST CASE : CASE 9 1. Weak coupling : the measured Kij may not be relevant due to strong coupling Page 1/11 f(hz) Path 1-3 Path 1-2 Path 1-4 Path 1-5 Path 2-6 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK 1 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK 2 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK 2. Diffuse vibration fields : if the measured velocity level decreases by more than 6 db over the allowed measurement area for any elemen of the tested junction, when the accelerometer is moved away from a stationary vibration source, then the measured Kij may not be relevant. K13 K12 K14 K15 K26 f(hz) Wall 1 Wall 3 Wall 1 Floor 2 Wall 1 Wall 4 Wall 1 Wall 5 Floor 2 Floor 6 NOK NOK NOK NOK NOK NOK NOK OK OK OK NOK NOK NOK NOK NOK NOK OK OK OK OK NOK NOK NOK NOK NOK NOK NOK OK OK OK NOK OK NOK OK NOK NOK NOK OK OK OK NOK NOK NOK NOK NOK NOK NOK OK OK OK NOK NOK NOK NOK OK NOK NOK OK OK OK NOK OK NOK NOK NOK NOK OK OK OK OK NOK NOK NOK NOK NOK NOK NOK OK OK OK OK NOK OK NOK OK NOK OK OK OK OK OK NOK OK OK OK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK 1 OK OK OK NOK NOK OK OK OK OK OK OK OK NOK OK OK OK OK OK OK OK OK OK OK NOK OK OK OK OK OK OK 2 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK NOK OK OK OK OK OK OK OK OK OK OK OK NOK OK OK OK OK OK 3. Background noise : in each frequency band the measured velocity level shall be at least 1 db higher than the background noise level. K13 K12 K14 K15 K26 f(hz) Wall 1 Wall 1 Wall 1 Floor 2 Wall 1 Wall 4 Wall 1 Wall 5 Floor 2 Floor 6 NOK OK OK OK NOK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK NOK NOK NOK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK NOK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK OK OK NOK NOK NOK OK OK OK OK OK NOK NOK NOK NOK NOK 1 OK OK OK OK NOK NOK NOK NOK NOK NOK OK OK OK OK NOK NOK NOK NOK NOK NOK OK OK OK OK NOK NOK NOK NOK NOK NOK 2 OK NOK OK OK NOK NOK NOK NOK NOK NOK OK NOK OK OK NOK NOK NOK NOK NOK NOK NOK NOK OK OK NOK NOK NOK NOK NOK NOK NOK NOK OK OK NOK NOK NOK NOK NOK NOK
13 Page 11/11 Annex 2 : Checking the measurement conditions TEST CASE : CASE 9 4. Number of modes in the 1/3 octave band, N : the mode count in 1/3 octave should be higher than 5 modes f(hz) Wall 1 Floor 2 Wall 3 Wall 4 Wall 5 Floor Modal overlap factor, M : for heavy element, it must be checked whether the modal overlap factor is at least unity at Hz and higher f(hz) Wall 1 Floor 2 Wall 3 Wall 4 Wall 5 Floor
14 TEST 9 : 26/9/7 f K13_9 K12_9 K14_9 K15_9 K26_9 [Hz] [db] [db] [db] [db] [db] ,731 27,5954 4, , , , , , , , , , , ,549 3, , , , , , , , , , , , , , , , , , , ,44517, , , , ,183, , , , , , , , , , , , , , ,446 1, ,45 33, ,4723 4, , , , ,744 43,45698, , ,763 66, ,5627, , , , ,2786, , , , , , , , , , , , , , , , Single valu49,3296 3, , ,8665 2,5267
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