SIST EN 1794-1:2004
(Main)Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements
Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements
This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical performance 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 the event of damage to noise reducing devices are also covered in Part 2 of this European Standard.
Lärmschutzeinrichtungen an Straßen - Nichtakustische Eigenschaften - Teil 1: Mechanische Eigenschaften und Anforderungen an die Standsicherheit
Diese Europäische Norm enthält Kriterien für die Klassifizierung von Lärmschutzeinrichtungen an Straßen nach grundlegenden mechanischen Eigenschaften unter Normbeanspruchungsbedingungen, unabhängig von den verwendeten Baustoffen. Die Norm enthält eine Reihe von Bedingungen und freigestellten Anforderungen, die die große Vielfalt der Baupraxis in Europa berücksichtigt. Einzelne Beanspruchungsarten werden in den Anhängen behandelt. Sicherheitstechnische Überlegungen im Falle der Beschädigung von Lärmschutzeinrichtungen werden in Teil 2 dieser Europäischen Norm behandelt.
Dispositifs de réduction du bruit du trafic routier - Performances non-acoustiques - Partie 1: Performances mécaniques et exigences en matiere de stabilité
La présente norme européenne spécifie des criteres permettant de classer les dispositifs de réduction du bruit du trafic routier en fonction de leur performance mécanique de base dans des conditions normales d'exposition, indépendamment des matériaux utilisés. Une gamme de conditions et d'exigences optionnelles est donnée afin de tenir compte de la grande diversité des pratiques en Europe. Les aspects individuels des performances sont couverts séparément dans les annexes. Les considérations relatives a la sécurité dans le cas de dommages aux dispositifs de réduction du bruit sont également couvertes dans la partie 2 de la présente norme européenne.
Protihrupne ovire za cestni promet – Neakustične lastnosti – 1. del: Mehanske lastnosti in zahteve za stabilnost
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lärmschutzeinrichtungen an Straßen - Nichtakustische Eigenschaften - Teil 1: Mechanische Eigenschaften und Anforderungen an die StandsicherheitDispositifs de réduction du bruit du trafic routier - Performances non-acoustiques - Partie 1: Performances mécaniques et exigences en matiere de stabilitéRoad traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements93.080.30Cestna oprema in pomožne napraveRoad equipment and installations17.140.30Emisija hrupa transportnih sredstevNoise emitted by means of transportICS:Ta slovenski standard je istoveten z:EN 1794-1:2003SIST EN 1794-1:2004en01-junij-2004SIST EN 1794-1:2004SLOVENSKI
STANDARDSIST EN 1794-1:19991DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1794-1April 2003ICS 93.080.30Supersedes EN 1794-1:1998English versionRoad traffic noise reducing devices - Non-acoustic performance- Part 1: Mechanical performance and stability requirementsDispositifs de réduction du bruit du trafic routier -Performances non-acoustiques - Partie 1: Performancesmécaniques et exigences en matières de stabilitéLärmschutzeinrichtungen an Straßen - NichtakustischeEigenschaften - Teil 1: Mechanische Eigenschaften undAnforderungen an die StandsicherheitThis European Standard was approved by CEN on 2 January 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1794-1:2003 E
EN 1794-1:2003 (E)2ContentspageForeword.3Introduction.41Scope.52Normative references.53Terms and definitions.54Symbols and abbreviations.65Requirements.76Test report.7Annex A (normative)
Wind load and static load.9Annex B (normative)
Self weight.14Annex C (normative)
Impact of stones.17Annex D (normative)
Safety in collision.21Annex E (normative)
Dynamic load from snow clearance.22
EN 1794-1:2003 (E)3ForewordThis document (EN 1794-1:2003) has been prepared by Technical Committee CEN /TC 226 "Road equipment", thesecretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latestby October 2003.This document supersedes EN 1794-1:1998.This European Standard consists of the following parts under the general title "Road traffic noise reducing devices– Non acoustic performance".¾ Part 1 : Mechanical performance and stability requirements¾ Part 2 : General safety and environmental requirementsAnnexes 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 CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
EN 1794-1:2003 (E)4IntroductionWhile performing their primary function, road traffic noise reducing devices are exposed to a range of forces due towind, dynamic air pressure caused by passing traffic, and the self weight of its component parts.
They can also besubjected to shocks caused by stones or other debris thrown up by vehicle tyres and, in some countries, thedynamic force of snow ejected by equipment used to clear roads in winter. The deflections of a noise reducingdevice under such loads during its design life should not reduce its effectiveness.
EN 1794-1:2003 (E)51 ScopeThis European Standard provides criteria to categorise road traffic noise reducing devices according to basicmechanical performance under standard conditions of exposure, irrespective of the materials used.
A range ofconditions and optional requirements is provided to allow for the wide diversity of practice within Europe. Individualaspects of performance are covered separately in the annexes.
Safety considerations in the event of damage tonoise reducing devices are covered in Part 2 of this European Standard.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).ENV 1991 -2-4, Eurocode 1, Basis of design and actions on structures: Part 2 -4 : Actions on structures - Windactions.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 methodsfor safety barriers.EN 1794-2: 2003, Road traffic noise reducing devices - Non acoustic performance - Part 2: General safety andenvironmental requirements.3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1noise barriernoise reducing device which obstructs the direct transmission of airborne sound emanating from road traffic3.2claddingnoise reducing device which is attached to a wall or other structure to reduce the amount of sound reflected3.3covernoise reducing device which either spans or overhangs the highway3.4structural elementelement whose primary function is to support or hold in place acoustic elements3.5acoustic elementelement whose primary function is to provide the acoustic performance of the device3.6mechanical test hammerdevice of the type used for measuring the elasticity of hard surfaces
EN 1794-1:2003 (E)63.7test areacentral area of a full size panel enclosed by a margin of 125 mm from each edge, as shown in Figure C.23.8vehicle occupants safe devicetraffic safe noise reducing device for which a vehicle impact does not cause more danger to the occupants thanallowed for safety barriers in EN 1317-2. However, it does not need to prevent the vehicle from going through it, noris it presumed that parts of the device are prevented from becoming detached3.9combined safety and noise barriertraffic safe noise reducing device which fulfils all the requirements for safety barriers in a given containment classas defined in EN 1317-23.10dynamic loadload due to snow thrown against a noise reducing device by snow ploughing equipment3.11ploughing speedspeed of the snow ploughing equipment as it passes the noise barrier4 Symbols and abbreviationsCe(z)exposure coefficientCppressure coefficientddeflection, in millimetresdhmaxhorizontal maximum deflection, in millimetresdvmaxvertical maximum deflection, in millimetreshtotal height of acoustic elements, in millimetresLlength of elements, in millimetresLSgreatest length of structural element, in millimetresLAgreatest length of acoustic element, in millimetresq(v)dynamic pressure due to passing vehicles, in pascalsSload factorSgload factor (weight)Swload factor (wind)Vrefmean wind velocity at height z, in metres per secondWwind pressure, in pascalszheight above the ground, in metres
EN 1794-1:2003 (E)7r air density, in kilograms per cubic metre5 Requirements5.1 Wind load and static loadLimiting 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.NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for resistance to windor static load.5.2 Self weightUnder standard conditions the deflections shall not exceed the limiting values given in annex B.NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for an element of anoise reducing device to support its own weight or the weight of other elements.5.3 Impact of stonesDamage caused by controlled impacts shall not exceed the criteria specified in annex C.NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for resistance to theimpact of stones.5.4 Safety in collisionWhen safety in collision has to be assessed, the behaviour under impacts specified in EN 1317-2 shall be classifiedin accordance with annex D.NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for verification ofsafety in the event of an impact by an errant vehicle.5.5 Dynamic forces from snow clearanceWhen the effects of dynamic forces from snow clearance have to be assessed, this shall be done in accordancewith annex E.NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for resistance to theforce of snow thrown sideways by clearance equipment.6 Test report6.1Every test report on aspects of performance shall include the following information:a) number and year of this European Standard, EN 1794-1 : 2003 ;b) full description of the element or system tested, including manufacturer(s), part numbers, place and date oforigin ;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 the assessor ;
EN 1794-1:2003 (E)8e) sufficient description of any tests carried out, any results measured and the conclusions drawn about theproduct together with any illustrations or photographs, all as specified in the appropriate annex.6.2A summary report shall be produced, identifying the aspects of performance for which detailed reports areavailable and the level of performance assessed, where appropriate.
EN 1794-1:2003 (E)9Annex A(normative)Wind load and static loadA.1 GeneralThe methods for calculating wind load on noise reducing devices have been harmonized to allow for the particularclimatic conditions within each region.As considerable differences existed in the methods of calculation used in different European countries, an efforthas been made to define an acceptable level of performance by applying load factors to the basic load calculatedto take account of its location. Limits are placed on deflections to avoid acoustic leakage either while the noisereducing 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 generaldemonstrated by calculations taking into account the values of elastic limit, modulus of elasticity, and other factorsrelating 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 intended use of thenoise reducing device.The range of temperature over which performance is within acceptance criteria is determined to enable noisereducing 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 minimummechanical requirements for structural and acoustical elements and fixing devices are given. Two sources ofaerodynamic load are considered: firstly, wind forces and secondly, dynamic air pressure due to passing vehicles.The forces acting on noise absorbing cladding attached to supporting walls are also considered.In the absence of specific Eurocodes existing Eurocodes for buildings are referred to.A.2 Aerodynamic loadA.2.1 GeneralAerodynamic load shall be considered acting normal to the exposed surface of the noise reducing device.NOTEDesign wind load and dynamic pressure due to vehicles can be assumed not to act simultaneously.A.2.2 Wind loadThe wind load shall be calculated in accordance with ENV 1991 -2-4, which is based on national maps showingbasic wind speeds.NOTEThe calculations can also be carried out taking a basic wind speed from more precise data, using a return period of50 years.The reference wind pressure in pascals, at height z above average ground level is calculated as :qVref12ref=r2(A.1)The resulting wind pressure (or suction) in pascals, on a barrier or other vertical noise reducing device is then :
EN 1794-1:2003 (E)10WqCzC=refe p()(A.2)A.2.3 Dynamic pressure due to vehiclesFor the standard cases a) to c), the following values of dynamic pressure (or suction) in pascals, shall be used:a) traffic of vehicles in open air at a distance of 1 m from the noise reducing device and at a maximum speed of100 km/h ;q(v) = 650b) traffic of vehicles in open air at a distance of 3 m from the noise reducing device and at speeds higher than120 km/h ;q(v) = 800c) bi-directional traffic in a tunnel, at a distance of 1 m from the noise reducing device and maximum speed of120 km/h ;q(v) = 1 500d) in other cases, independent calculations shall be made to ascertain the magnitude of dynamic pressure.A.3 Mechanical requirements for free standing noise barriersA.3.1 GeneralThe temperature range, within limits of -30 °C to + 70 °C, over which the requirements in A.3.2 to A.3.4 are metshall be reported. For the purposes of calculation or test, temperature intervals of 10 °C shall be used.A.3.2 Structural elementsA.3.2.1 GeneralIn determining deflections of structural elements, rotation and displacements originating from foundations shall notbe taken into account.A.3.2.2 Vertical noise barriersa) The maximum horizontal elastic deflection dhmax, in millimetres, under the design wind load shall be less than ;150SLhmax=db) When a load factor of S = 1,5 is applied to the design wind load ;i) the element shall not show any symptoms of failure such as buckling, permanent displacement ofacoustic elements, or cracks greater than acceptable for exposure to a severe corrosiveenvironment ;ii) the element shall not become detached from its supports or fixings ;iii) the permanent deformation dhmax, in millimetres, after release of the load shall be less than ;500SLhmax=d
EN 1794-1:2003 (E)11A.3.2.3 Non-vertical barriersLoad due to snow, self weight, etc. shall be considered as acting together with wind load. The acceptance criteriaare as given in A.3.2.2. except that additionally the elastic vertical deflection dvmax, in millimetres, shall be less than :300SLvmax=dA.3.3 Acoustic elementsA.3.3.1 GeneralAn acoustic element shall not transmit loads from other acoustic elements to the structural elements unless thistransmission is taken into account in the calculations.A.3.3.2 Vertical noise reducing devicesa) For the two cases LA and h, the maximum horizontal elastic deflection, dhmax, due to bending under the designwind load shall be less than 50 mm ;b) when a load factor of S = 1,5 is applied to the design wind load ;i) the element shall not show any symptoms of failure such as buckling, permanent displacement ofabsorptive material, or cracks greater than acceptable for exposure to a severecorrosive environment
;ii) the element shall not become detached from its supports or fixings ;iii) the permanent deformation dhmax, in millimetres, after release of the load shall be less than thesmaller of A500L and h500.iv) the deflections of structural elements shall not cause acoustic elements to become permanentlydisplaced.A.3.3.3 Non-vertical constructionsLoad due to snow, self weight, etc. shall be considered as acting together with wind load. The acceptance criteriaare as given in A.3.3.2 except that additionally the elastic vertical deflection dvmax, in millimetres, shall be less thanthe smaller of A200L and h200.A.3.4 Self supporting elementsA.3.4.1Acoustic elements which are not supported or kept in place by another structure shall meet all thecriteria given in A.3.3.1 to A.3.3.3.A.3.4.2Load bearing acoustic elements shall be designed to withstand all superimposed forces and meet thecriteria specified in A.3.2 and A.3.3.
EN 1794-1:2003 (E)12A.4 Mechanical requirements for fixings of acoustical elements or structuresA.4.1 Fixings for vertical noise reducing devicesFixings such as bolts, welds, adhesives, etc. shall withstand the force which they are designed to support multipliedby a factor S = 1,5 without symptoms of failure such as cracks or plastic deformation.A.4.2 Fixing devices for non-vertical constructionsLoad due to snow, self weight, etc. shall be considered as acting together with wind load. The acceptance criteriaare as given in A.4.1 except that the load shall be multiplied by a factor S = 1,75.A.5 Noise absorbin
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