1、BRITISH STANDARD BS 5821-3: 1984 ISO 717/3-1982 Methods for Rating the sound insulation in buildings and of building elements Part 3: Method for rating the airborne sound insulation of faade elements and faades ISO title: Acoustics Rating of sound insulation in buildings and of building elements Par
2、t3: Airborne sound insulation of facade elements and faades UDC 699.844+692:534.83:534.6BS5821-3:1984 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Committee, was published under the authority of the Board of BSI and comes into effect on 3
3、1December1984 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference EPC/1 Draft (ref 81/50102) announced in BSI News March1981 ISBN 0 580 14228 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the
4、 Environment and Pollution Standards Committee (EPC/-) to Technical Committee EPC/1 upon which the following bodies were represented: Association of Consulting Engineers Institute of Acoustics BEAMA Transmission and Distribution Institute of Occupational Hygienists Association Institute of Physics B
5、ritish Broadcasting Corporation Institute of Sound and Vibration Research British Occupational Hygiene Society Institution of Electronic and Radio British Telecommunications Engineers Department of Health and Social Security Institution of Municipal Engineers Department of the Environment (Building
6、Petroleum Industry Association Research Establishment) Royal Institute of British Architects Department of Trade and Industry Society of Environmental Engineers (National Physical Laboratory) Coopted members Health and Safety Executive Incorporated Association of Architects and Surveyors The followi
7、ng bodies were also represented in the drafting of the standard, through subcommittees and panels: Aggregate Concrete Block Association Concrete Society Association of Building Component Gypsum Products Development Association Manufacturers Ltd. Hevac Association Autoclaved Aerated Concrete Products
8、 National Brassfoundry Association Association Structural Insulation Association Brick Development Association Suspended Ceilings Association British Ceramic Research Association Timber Research and Development Cement Makers Federation Association Amendments issued since publication Amd. No. Date of
9、 issue CommentsBS5821-3:1984 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Procedure for evaluating single-number quantities 1 5 Statement of results 2 Figure 1 Curve of r
10、eference values for airborne sound 3 Table 1 Single-number quantities of airborne sound insulation properties of exterior building elements 2 Table 2 Single-number quantity of airborne sound protection by faades 2 Table 3 Reference values of airborne sound 3 Publications referred to Inside back cove
11、rBS5821-3:1984 ii BSI 03-1999 National foreword This Part of BS5821 has been prepared under the direction of the Environment and Pollution Standards Committee and is identical with ISO717/3-1982 “Acoustics Rating of sound insulation in buildings and of building elements Part3: Airborne sound insulat
12、ion of faade elements and faades” prepared by Technical Committee43, Acoustics, with the active participation and approval of the UK and published by the International Organization for Standardization (ISO). ISO717/1 and ISO717/2 are also being published as Parts of BS5821, which now comprises the f
13、ollowing Parts: Part 1: Method for rating the airborne sound insulation in buildings and of interior building elements; Part 2: Method for rating the impact sound insulation; Part 3: Method for rating the airborne sound insulation of faade elements and faades. Terminology and conventions. The text o
14、f the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal ma
15、rker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “this part of ISO717” appear, referring to this standard, they should be read as “this Part of BS5821”. Additional information. The use of the word “standardized” in Table
16、2 indicates values obtained from field measurements that have been corrected to a receiving room reverberation time of0.5s (see BS2750-4:1980 “Field measurements of airborne sound insulation between rooms” and BS2750-7:1980 “Field measurements of impact sound insulation of floors”). For guidance on
17、the interpretation of differences between laboratory and field measurements, see CP3 “Code of basic data for the design of buildings” Chapter III:1972 “Sound insulation and noise reduction” 1) . Cross-references International standard Corresponding British Standard BS 2750 Methods of measurement of
18、sound insulation in buildings and of building elements ISO 140/3-1978 Part 3:1980 Laboratory measurements of airborne sound insulation of building elements (Identical) ISO 140/5-1978 Part 5:1980 Field measurements of airborne sound insulation of faade elements and faades (Identical) ISO 717/1-1982 B
19、S 5821 Methods for rating the sound insulation in buildings and of building elements Part 1:1984 Method for rating the airborne sound insulation in buildings and of interior building elements (Identical) 1) In course of revision.BS5821-3:1984 BSI 03-1999 iii Although the term “single-number quantity
20、” is used in this standard, the term “index” is more usual usage within the United Kingdom. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not
21、 of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be
22、 indicated in the amendment table on theinside front cover.iv blankBS5821-3:1984 BSI 03-1999 1 0 Introduction Methods of measurement of airborne sound insulation of faade elements and faades have been standardized in ISO140/3 and ISO140/5. These methods give values for airborne sound insulation whic
23、h are frequency dependent. The purpose of this part of ISO717 is to standardize a method whereby the frequency dependent values of airborne sound insulation can be converted into a single number characterizing the acoustical performance. In the interest of uniformity of airborne sound insulation rat
24、ings for various types of building elements for both internal and external use, the reference curve of ISO717/1 has been adopted also for the rating of faade elements and faades. Investigations and calculations have shown that, mathematically, ratings according to this curve correlate well with rati
25、ngs according to other reference curves proposed specifically for outside noise. These curves are generally more stringent in the low frequency range and would therefore lead to lower single-number ratings than the reference curve used in this part of ISO717. However, equal protection against outsid
26、e noise can be obtained by specifying the requirements in building codes accordingly. 1 Scope and field of application This part of ISO717 defines single-number quantities for the airborne sound insulation of faades, faade elements, windows, doors, roofs, and gives rules for determining these quanti
27、ties from the results of measurements carried out in one-third octave bands according to ISO140/3 and ISO140/5. The single-number quantities according to this part of ISO717 are intended for rating the airborne sound insulation and for simplifying the formulation of acoustical requirements in buildi
28、ng codes. The required numerical values of the single-number quantities can be specified according to varying needs. 2 References ISO 140, Acoustics Measurement of sound insulation in buildings and of building elements Part 3: Laboratory measurements of airborne sound insulation of building elements
29、 Part 5: Field measurements of airborne sound insulation of faade elements and faades. ISO 717/1, Acoustics Rating of sound insulation in buildings and of building elements Part 1: Airborne sound insulation in buildings and of interior building elements. 3 Definition single-number quantity for airbo
30、rne sound insulation rating the value, in decibels, of the reference curve at500Hz after shifting it according to the method laid down in this part of ISO717 terms and symbols for the single-number quantity used depend on the type of measurement. They are listed in Table 1 for airborne sound insulat
31、ion properties of exterior building elements and in Table 2 for airborne sound protection by faades NOTEIn order to distinguish clearly between values with and without flanking transmission, primed symbols (for example R9) are used to denote values obtained with flanking transmission. 4 Procedure fo
32、r evaluating single-number quantities 4.1 General The values obtained according to ISO140/3 and ISO140/5 are compared with reference values (see4.2) at the frequencies of measurement within the range of100 to3150Hz. The comparison is carried out according to4.3. 4.2 Reference values The set of refer
33、ence values used for comparison with measurement results is specified in Table 3 and shown in the figure. 4.3 Method of comparison To evaluate the results of a measurement of R, R tr , R, R ,oc , R9 or D nT,trin one-third octave bands (preferably given to one decimal place), the reference curve is s
34、hifted in steps of1dB towards the measured curve until the mean unfavourable deviation, calculated by dividing the sum of the unfavourable deviations by the total number (i.e.16) of measurement frequencies, is as large as possible but not more than2,0dB. An unfavourable deviation at a particular fre
35、quency occurs when the result of measurements is less than the reference value. Only the unfavourable deviations are taken into account. The value, in decibels, of the reference curve at500Hz, after shifting it according to this procedure, is R w , R tr,w , R ,w, R ,oc,w , R9 wor D nT,tr,w9 respecti
36、vely. In addition, the maximum unfavourable deviation at any frequency shall be recorded, if it exceeds8,0dB.BS5821-3:1984 2 BSI 03-1999 5 Statement of results The appropriate single-number quantity shall be given with reference to this part of ISO717. Also, the maximum unfavourable deviation shall
37、be reported, if it exceeds8,0dB. The results of measurements shall also be given in the form of a diagram as specified in ISO140/3 and ISO140/5, and shall include the shifted reference curve exemplified in the figure. Table 1 Single-number quantities of airborne sound insulation properties of exteri
38、orbuilding elements Table 2 Single-number quantity of airborne sound protection by faades Single-number quantity Symbol Derived from one-third octave band values name symbol defined in ISO 140 part formula R w R 3 (3) Weighted sound reduction index R tr,w sound reduction index R tr 5 (1) R ,w R 5 (5
39、) R ,oc,w R ,oc 5 (6) Weighted apparent sound reduction index R9 w apparent sound reduction index R9 3 (5) Single-number quantity Symbol Derived from one-third octave band values name symbol defined in ISO 140 part formula Weighted standardized level difference D nT,tr,w standardized level differenc
40、e D nT,tr 5 (2)BS5821-3:1984 BSI 03-1999 3 Table 3 Reference values of airborne sound Frequency Reference value Hz dB 100 33 125 36 160 39 200 42 250 45 315 48 400 51 500 52 630 53 800 54 1 000 55 1 250 56 1 600 56 2 000 56 2 500 56 3 150 56 Figure Curve of reference values for airborne sound4 blank
41、BS5821-3:1984 BSI 03-1999 Publications referred to See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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