1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1794-1:2011Road traffic noise reducingdevices Non-acousticperformancePart 1: Mechanical performance andstability requirementsBS EN 1794-1:2011 BRITISH STANDARDNational fore
2、wordThis British Standard is the UK implementation of EN 1794-1:2011. Itsupersedes BS EN 1794-1:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/509/6, Fences for the attenuation of noise.A list of organizations represented on this committee can b
3、eobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 68334 3ICS 93.080.30Compliance with a British Standard cannot confer immunity fromlegal obligations.T
4、his British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2011.Amendments issued since publicationDate Text affectedBS EN 1794-1:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1794-1 January 2011 ICS 93.080.30 Supersedes EN 1794-1:2
5、003English Version Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements Dispositifs de rduction du bruit du trafic routier - Performances non acoustiques - Partie 1: Performances mcaniques et exigences en matire de stabilit Lrmsch
6、utzeinrichtungen an Straen - Nichtakustische Eigenschaften - Teil 1: Mechanische Eigenschaften und Anforderungen an die Standsicherheit This European Standard was approved by CEN on 10 December 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condit
7、ions 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists
8、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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standa
9、rds bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and Un
10、ited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1794-1:201
11、1: EBS EN 1794-1:2011EN 1794-1:2011 (E) 2 Contents page Foreword 3Introduction . 41 Scope 52 Normative references 53 Terms and definitions . 54 Symbols and abbreviations 65 Requirements . 75.1 General 75.2 Wind load and static load . 75.3 Vibration and fatigue effects 75.4 Self weight 75.5 Impact of
12、 stones 75.6 Safety in collision 75.7 Dynamic forces from snow clearance . 76 Test report 8Annex A (normative) Wind load and static load . 9Annex B (normative) Self weight 16Annex C (normative) Impact of stones 19Annex D (normative) Safety in collision 22Annex E (normative) Dynamic load from snow cl
13、earance 23Bibliography 26BS EN 1794-1:2011EN 1794-1:2011 (E) 3 Foreword This document (EN 1794-1:2011) 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 standard, either by
14、publication of an identical text or by endorsement, at the latest by July 2011, and conflicting national standards shall be withdrawn at the latest by July 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC s
15、hall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1794-1:2003. This European Standard consists of the following parts under the general title “Road traffic noise reducing devices Non acoustic performance“. Part 1: Mechanical performance and stabi
16、lity requirements Part 2: General safety and environmental requirements The main changes compared to the previous edition are: a) fatigue (A.2.3.2); b) the wind load for low barriers; c) addition to Annex A of a note on shape factors. According to the CEN/CENELEC Internal Regulations, the national s
17、tandards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norwa
18、y, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 1794-1:2011EN 1794-1:2011 (E) 4 Introduction While performing their primary function, road traffic noise reducing devices are exposed to a range of forces due to wind, dynamic air pressure caused b
19、y passing traffic, and the self weight of its component parts. They can 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 ejected by equipment used to clear roads in winter. The deflections of a noise reducing de
20、vice under such loads during its design life should not reduce its effectiveness. BS EN 1794-1:2011EN 1794-1:2011 (E) 5 1 Scope This European Standard specifies criteria to categorise road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure,
21、 irrespective of the materials used. A range of conditions and optional requirements is provided in order to take into account the wide diversity of practice in Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to noise redu
22、cing devices are covered in Part 2 of this European Standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document
23、(including any amendments) applies. EN 1991-1-4, Eurocode 1: Actions on structures Part 1-4: General actions 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
24、criteria and test methods for safety barriers including vehicle parapets EN 1794-2:2011, Road traffic noise reducing devices Non-acoustic performance Part 2: General safety and environmental requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions a
25、pply. 3.1 noise barrier noise reducing device which obstructs the direct transmission of airborne sound emanating from road traffic 3.2 cladding noise reducing device which is attached to a wall or other structure to reduce the amount of sound reflected 3.3 cover noise reducing device which either s
26、pans or overhangs the highway 3.4 structural element element whose primary function is to support or hold in place acoustic elements 3.5 acoustic element element whose primary function is to provide the acoustic performance of the device 3.6 mechanical test hammer device of the type used for measuri
27、ng the elasticity of hard surfaces 3.7 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 BS EN 1794-1:2011EN 1794-1:2011 (E) 6 3.8 vehicle occupants safe device traffic safe noise reducing device for which a vehicle impact does not caus
28、e more danger to the occupants than allowed for safety barriers in EN 1317-2 NOTE 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. 3.9 combined safety and noise barrier traffic safe noise reducin
29、g device which fulfils all the requirements for safety barriers in a given containment class as defined in EN 1317-2 3.10 wind load wind load that include all factors in this European Standard 3.11 design wind load wind load specific to a geographical region as defined in Eurocodes (EN 1991-2-4) 3.1
30、2 dynamic load load due to snow thrown against a noise reducing device by snow ploughing equipment 3.13 ploughing speed speed of the snow ploughing equipment as it passes the noise barrier 4 Symbols and abbreviations Ce(z) exposure coefficient Cppressure coefficient d deflection, in millimetres dhma
31、xhorizontal maximum deflection, in millimetres dvmaxvertical maximum deflection, in millimetres Hnrdtotal height of acoustic elements constituting the whole reducing device, in millimetres hae height of a single acoustic element, in millimetres L length of elements, in millimetres LSgreatest length
32、of structural element, in millimetres LAgreatest free length of acoustic element (between its supporting structural elements), in millimetres q(v)dynamic pressure due to passing vehicles, in Pascals S load factor SGload factor (weight) SWload factor (wind) BS EN 1794-1:2011EN 1794-1:2011 (E) 7 Vrefm
33、ean wind velocity at height z, in metres per second W wind pressure, in Pascals z height above the ground, in metres air density, in kilograms per cubic metre 5 Requirements 5.1 General Under any of the following loads, elements shall not become detached from their supports or fixings. 5.2 Wind load
34、 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 applied in accordance with Annex A. NOTE This European Standard permits specifying authorities to indicate that there is no
35、 requirement for resistance to wind or static load. 5.3 Vibration and fatigue effects All the relevant standards are specified in A.2.3.2. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for vibration and fatigue effect. 5.4 Self weight Under stand
36、ard conditions the deflections shall not exceed the limiting values given in Annex B. 5.5 Impact of stones Damage caused by controlled impacts shall not exceed the criteria specified in Annex C. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for r
37、esistance to the impact of stones. 5.6 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. NOTE This European Standard permits specifying authorities to indicate that there is no requireme
38、nt for verification of safety in the event of an impact by an errant vehicle. 5.7 Dynamic forces from snow clearance When the effects of dynamic forces from snow clearance have to be assessed, this shall be done in accordance with Annex E. NOTE This European Standard permits specifying authorities t
39、o indicate that there is no requirement for resistance to the force of snow thrown sideways by clearance equipment. BS EN 1794-1:2011EN 1794-1:2011 (E) 8 6 Test report 6.1 Every test report on aspects of performance shall include the following information: a) number and year of this European Standar
40、d, i.e. EN 1794-1:2011; b) full description of the element or system tested, including manufacturer(s), part numbers, place and date of origin; c) description of the method of sampling, if parts of manufactured elements are evaluated by testing; d) place and date of the assessment, and the name of t
41、he assessor; e) 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. 6.2 A summary report shall be produced, identifying the aspects of performance
42、for which detailed reports are available and the level of performance assessed, where appropriate. BS EN 1794-1:2011EN 1794-1:2011 (E) 9 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 par
43、ticular climatic conditions within each region. As considerable differences existed in the methods of calculation used in different European 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 lo
44、cation. Limits are placed on deflections to avoid acoustic leakage either while the noise reducing device is being subjected to its design wind load or afterwards. Adequacy of mechanical performance in fulfilling the structural criteria given in this annex is in general demonstrated by calculations
45、taking into account the values of elastic limit, modulus of elasticity, and other factors relating to the materials employed in the construction. 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 int
46、ended use of the noise reducing device. The range of temperature over which performance is within acceptance criteria is determined to enable noise reducing devices to be appropriately specified for extreme conditions of heat or cold. This annex specifies the mechanical requirements for noise reduci
47、ng 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, wi
48、nd forces and secondly, dynamic air pressure due to passing vehicles. The forces acting on noise absorbing cladding attached to supporting walls are also considered. A.2 Aerodynamic load A.2.1 General Aerodynamic load shall be considered acting normal to the exposed surface of the noise reducing dev
49、ice. NOTE Wind load and dynamic pressure due to vehicles can be assumed not to act simultaneously. A.2.2 Design wind load The design wind load shall be calculated in accordance with EN 1991-1-4, which is based on national maps showing basic wind speeds. NOTE The calculations can also be carried out taking a basic wind speed from more precise data, using a return period of 50 years. A.2.3 Dynamic effects due to vehicles A.2.3.1 Dynamic pressure For the standard cases a) to c), the followi
