EN 1794-1:2011

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 matière 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 1794-1:2011SIST EN 1794-1:2011en,fr,de01-julij-2011SIST EN 1794-1:2011SLOVENSKI
STANDARDSIST EN 1794-1:20041DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1794-1
January 2011 ICS 93.080.30 Supersedes EN 1794-1:2003English Version
Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements
Dispositifs de réduction du bruit du trafic routier - Performances non acoustiques - Partie 1: Performances mécaniques et exigences en matière de stabilité
Lärmschutzeinrichtungen an Straßen - 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 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 CEN-CENELEC 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 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.
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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 1794-1:2011: ESIST EN 1794-1:2011

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 clearance . 23Bibliography . 26
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 device under such loads during its design life should not reduce its effectiveness. SIST EN 1794-1:2011

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 reducing 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 (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 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 apply. 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 spans 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 measuring 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 SIST EN 1794-1:2011

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 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 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 standard 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 resistance 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 requirement 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 to indicate that there is no requirement for resistance to the force of snow thrown sideways by clearance equipment. SIST EN 1794-1:2011

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 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 location. 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 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 intended 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 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. 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 device. 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 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 of 100 km/h; SIST EN 1794-1:2011

b) traffic of vehicles in open air at a distance of 3 m from the noise reducing device and at speeds higher than 120 km/h; q(v) = 800
c) bi-directional traffic in a tunnel, at a distance of 1 m from the noise reducing device and maximum speed of 120 km/h; q(v) = 1 500
d) in other cases, independent calculations shall be made to ascertain the magnitude of dynamic pressure. A.2.3.2 Fatigue If noise reducing devices are located close to either the side of roads or the ceiling of tunnels and covers, the combination of the following factors could lead to cycles of pressure differences and fatigue to occur: (i) shape and speed of passing vehicles; (ii) distance to and shape of the device. The relevant standards are: • EN 1991-1-4:2005, Eurocode 1: Action on structures — Part 4 General actions — Wind actions. Prescriptions are described in 7.4.1 wind loads for free standing walls and the number of loads for dynamic response is described in B.3. • EN 1993-1-9:2005, Eurocode 3: Design of steel structures — Part 1-9: Fatigue. This code give all relevant information required for steel structures. The choice is described in EN 1993-1-9:2005, Table 3.1. Alongside roads “safe live” is required. • EN 1999-1-1:2007, Eurocode 9: Design of aluminium structures — Part 1-1: General structural rules • EN 1999-1-3:2007, Eurocode 9: Design of aluminium structures — Part 1-3: Structures susceptible to fatigue A.3 Mechanical requirements for free standing noise barriers A.3.1 General The temperature range, within limits of - 30 °C to + 70 °C, over which the requirements in A.3.2 to A.3.4 are met shall be reported. For the purposes of calculation or test, temperature intervals of 10 °C shall be used. A.3.2 Structural elements A.3.2.1 General In determining deflections of structural elements, rotation and displacements originating from foundations shall not be taken into account. A.3.2.2 Vertical noise barriers a) The maximum horizontal elastic deflection dhmax, in millimetres, under the design wind load shall be less than; SIST EN 1794-1:2011

100maxShLd= for
Hnrd ≤ 3 m
dhmax = 30 mm for 3 m ≤ Hnrd ≥ 4,5 m
150maxShLd= for Hnrd
> 4,5 m
b) when a load factor of SW = 1,5 is applied to the design wind load; i) the element shall not show any symptoms of failure such as buckling, permanent displacement of acoustic elements, or cracks greater than acceptable for exposure to a severe corrosive 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; 500maxShLd=
A.3.2.3 Non-vertical noise barriers Load due to snow, self weight, etc. shall be considered as acting together with wind load. The acceptance criteria are as given in A.3.2.2. except that additionally the elastic vertical deflection dvmax, in millimetres, shall be less than: 300maxShLd= A.3.3 Acoustic elements A.3.3.1 General An acoustic element shall not transmit loads from other acoustic elements to the structural elements unless this transmission is taken into account in the calculations. A.3.3.2 Vertical noise reducing devices a) The maximum horizontal elastic deflection, dhmax, in millimetres, due to bending under the design wind load shall be less than:
dhmax = min (40AL, 50 mm) for LA ≤ 5 m
dhmax = 100ALfor LA > 5 m 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 of absorptive material, or cracks greater than acceptable for exposure to a severe corrosive environment; ii) the element shall not become detached from its supports or fixings; SIST EN 1794-1:2011

iv) the deflections of structural elements shall not cause acoustic elements to become permanently displaced. A.3.3.3 Non-vertical noise reducing devices Load due to snow, self weight, etc. shall be considered as acting together with wind load. The acceptance criteria are as given in A.3.3.2 except that additionally the elastic vertical deflection dvmax, in millimetres, shall be less than A200L
A.3.4 Self supporting elements A.3.4.1 Acoustic elements which are not supported or kept in place by another structure shall meet all the criteria given in A.3.3.1 to A.3.3.3. A.3.4.2 Load bearing acoustic elements shall be designed to withstand all superimposed forces and meet the criteria specified in A.3.2 and A.3.3. A.4 Mechanical requirements for fixings of acoustical elements or structures A.4.1 Fixings for vertical noise reducing devices Fixings such as bolts, welds, adhesives, etc. shall withstand the force which they are designed to support multiplied by a factor S = 1,5 without symptoms of failure such as cracks or plasti
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