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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1794-1:1998 The Eur
2、opean Standard EN 1794-1:1998 has the status of a British Standard ICS 93.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Road traffic noise reducing devices Non-acoustic performance Part 1: Mechanical performance and stability requirements Licensed Copy: sheffieldun sh
3、effieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 November 1998 BSI
4、 1998 ISBN 0 580 30454 X BS EN 1794-1:1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 1794-1:1998. The UK participation in its preparation was entrusted by Technical Committee B/509, Road equipment, to S
5、ubcommittee B/509/6, Fences for the attenuation of noise, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related internation
6、al and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in
7、 the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are res
8、ponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. Licensed Copy:
9、 sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in
10、 any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1794-1:1998 E EUROPEAN STANDARDEN 1794-1 NORME EUROPE ENNE EUROPA ISCHE NORM July 1998 ICS 93.080.30 Descriptors: Environmental protection, acoustics, noise: sound, roads, traffic, lanes, acoustic shields, noise redu
11、ction, tests, mechanical properties, computation, loads: forces, stability English version Road traffic noise reducing devices Non-acoustic performance Part1: Mechanical performance and stability requirements Dispositifs de re duction du bruit du trafic routier Performances non acoustiques Partie 1:
12、 Performances me caniques et exigences en matie re de stabilite La rmschutzeinrichtungen an Straen Nichtakustische Eigenschaften Teil 1: Mechanische Eigenschaften und Anforderungen an die Standsicherheit This European Standard was approved by CEN on 21 June 1998. CEN members are bound to comply with
13、 the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretaria
14、t or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official v
15、ersions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Fri No
16、v 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1794-1:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 226, Road equipment, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national stand
17、ard, either by publication of an identical text or by endorsement, at the latest by January 1999, and conflicting national standards shall be withdrawn at the latest by January 1999. This European Standard consists of the following parts under the general title Road traffic noise reducing devices No
18、n-acoustic performance: Part 1: Mechanical performance and stability requirements; Part 2: General safety and environmental requirements. Annexes A to E of this part of EN 1794 are normative. Another standard covering long term durability (service life) is in course of preparation. According to the
19、CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swe
20、den, Switzerland and the United Kingdom. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions and symbols3 4Requirements4 5Test report4 Annex A (normative) Wind load and static load5 Annex B (normative) Self weight7 Annex C (normative) Impact of stones8 Annex D (normativ
21、e) Safety in collision10 Annex E (normative) Dynamic load from snow clearance11 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1794-1:1998 BSI 1998 Introduction While performing their primary function, road traffic noise reducing
22、devices are exposed to a range of forces due to wind, dynamic air pressure caused by passing traffic, and the self weight of its component parts. They may also be subjected to shocks caused by stones or other debris thrown up by vehicle tyres, and, in some countries, the dynamic force of snow ejecte
23、d by equipment used to clear roads in winter. The deflections of a noise reducing device under such loads during its design life should not reduce its effectiveness. 1 Scope This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical perf
24、ormance under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided to allow for the wide diversity of practice within Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in
25、the event of damage to noise reducing devices are covered in part 2 of this European Standard. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
26、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ENV
27、 1991-2-4, Eurocode 1: Basis of design and actions on structures: Part 2-4: Wind actions. EN 1317-1, Road restraint systems Part 1: Terminology and general criteria for test methods. EN 1317-2, Road restraint systems Part 2: Performance classes, impact test acceptance criteria and test methods for s
28、afety barriers. EN 1794-2:1998, Road traffic noise reducing devices Non-acoustic performance Part 2: General safety and environmental requirements. 3 Definitions and symbols 3.1 Definitions For the purposes of this standard, the following definitions apply. 3.1.1 noise barrier noise reducing device
29、which obstructs the direct transmission of airborne sound emanating from road traffic 3.1.2 cladding noise reducing device which is attached to a wall or other structure to reduce the amount of sound reflected 3.1.3 cover noise reducing device which either spans or overhangs the highway 3.1.4 struct
30、ural element element whose primary function is to support or hold in place acoustic elements 3.1.5 acoustic element element whose primary function is to provide the acoustic performance of the device 3.1.6 mechanical test hammer device of the type used for measuring the elasticity of hard surfaces 3
31、.1.7 test area central area of a full size panel enclosed by a margin of 125 mm from each edge, as shown in Figure C.2 3.1.8 vehicle occupants safe device a traffic safe noise reducing device for which a vehicle impact does not cause more danger to the occupants than allowed for safety barriers in E
32、N 1317-2. However, it does not need to prevent the vehicle from going through it, nor is it presumed that parts of the device are prevented from becoming detached 3.1.9 combined safety and noise barrier a traffic safe noise reducing device which fulfils all the requirements for safety barriers in a
33、given containment class as defined in EN 1317-2 3.1.10 dynamic load load due to snow thrown against a noise reducing device by snow ploughing equipment 3.1.11 ploughing speed speed of the snow ploughing equipment as it passes the noise barrier 3.2 Symbols Ce(z)exposure coefficient; Cppressure coeffi
34、cient; ddeflection, in millimetres; dmaxmaximum deflection, in millimetres; htotal height of elements, in millimetres; Llength of elements, in millimetres; Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1794-1:1998 BSI 1998 LSgrea
35、test length of structural element, in millimetres; LAgreatest length of acoustic element, in millimetres; q(v)dynamic pressure due to passing vehicles, in pascals; Sload factor; SGload factor (weight); SWload factor (wind); Vrefmean wind velocity at height z, in metres per second; Wwind pressure, in
36、 pascals; zheight above the ground, in metres; rair density, in kilograms per cubic metre. 4 Requirements 4.1 Wind load and static load Limiting values for elastic and permanent deflections shall not exceed the values specified in annex A. To ensure connections do not fail load factors shall be appl
37、ied in accordance with annex A. NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for resistance to wind or static load. 4.2 Self weight Under standard conditions the deflections shall not exceed the limiting values given in annex B. NOTEThis European
38、 Standard permits specifying authorities to indicate that there is no requirement for an element of a noise reducing device to support its own weight or the weight of other elements. 4.3 Impact of stones Damage caused by controlled impacts shall not exceed the criteria specified in annex C. NOTEThis
39、 European Standard permits specifying authorities to indicate that there is no requirement for resistance to the impact of stone. 4.4 Safety in collision When safety in collision has to be assessed, the behaviour under impacts specified in EN 1317-2 shall be classified in accordance with annex D. NO
40、TEThis European Standard permits specifying authorities to indicate that there is no requirement for verification of safety in the event of an impact by an errant vehicle. 4.5 Dynamic forces from snow clearance When the effects of dynamic forces from snow clearance have to be assessed, this shall be
41、 done in accordance with annex E. NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for resistance to the force of snow thrown sideways by clearance equipment. 5 Test report 5.1 Every test report on aspects of performance shall include the following i
42、nformation: a) the number and year of this European Standard, EN 1794-1:1998; b) a full description of the element or system tested, including manufacturer(s), part numbers, place and date of origin; c) a description of the method of sampling, if parts of manufactured elements are evaluated by testi
43、ng; d) the place and date of the assessment, and the name of the assessor; e) a sufficient description of any tests carried out, any results measured and the conclusions drawn about the product, together with any illustrations or photographs, all as specified in the appropriate annex. 5.2 A summary
44、report shall be produced, identifying the aspects of performance for which detailed reports are available and the level of performance assessed, where appropriate. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1794-1:1998 BSI 199
45、8 Annex A (normative) Wind load and static load A.1 General The methods for calculating wind load on noise reducing devices have been harmonized to allow for the particular climatic conditions within each region. As considerable differences existed in the methods of calculation used in different Eur
46、opean countries, an effort has been made to define an acceptable level of performance by applying load factors to the basic load calculated to take account of its location. Limits are placed on deflections to avoid acoustic leakage either while the noise reducing device is being subjected to its des
47、ign wind load or afterwards. Adequacy of mechanical performance in fulfilling the structural criteria given in this annex is in general demonstrated by calculations taking into account the values of elastic limit, modulus of elasticity, and other factors relating to the materials employed in the con
48、struction. In cases where calculations are thought to be unreliable, tests are used to determine the resistance of the elements in the same arrangement as in the intended use of the noise reducing device. The range of temperature over which performance is within acceptance criteria is determined to
49、enable noise reducing devices to be appropriately specified for extreme conditions of heat or cold. This annex specifies the mechanical requirements for noise reducing devices exposed to aerodynamic load, excepting the design of foundations. The method of calculating aerodynamic and static loads and the minimum mechanical requirements for structural and acoustical elements and fixing devices are given. Two sources of aerodynamic load are considered: firstly, wind forces and secondly, dynamic air pressure due to passing vehicles. T
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