Evaluation criteria of Vehicle Restraint Systems

Transcription

1 Evaluation criteria of Vehicle Restraint Systems Δ Despoina Drymalitou Member of WG1 and TG2/TC 226/CEN M.Sc. Transportation and Infrastructure Engineer, Greece

2 Basic problem: A large number of certified restraint systems are available in European market Having different structural properties

3 Most pertinent questions: The sources of reliable information concerning restraint systems (VRS) The type(s) of technical information required to form a complete picture of restraint systems direct comparison between the different restraint systems The evaluation criteria to be adopted in conjunction with VRS s technical features and the installation location

4 Sources of reliable technical information: The installation manuals What are these manuals? These manuals are official documents, which accompany each system and are approved by the Notify Body These include the description of the system and all the related drawings and information acc. to EN such as the appropriate installation conditions

5 Installation manual of a system = Technical specification of a system What we should take into account: The installation manual should cover the particular installation conditions As far as installation conditions are concerned, a guarantee is provided by the manufacturer under a Declaration of Performance (DoP), acc. to Article 4(3) of EU Regulation No. 305/2011 (CPR)

6 Description of Vehicle Restraint Systems (VRS): Safety barriers Transitions Crash Cushions Terminals RBS

7 Safety Barriers acc. to ΕΝ System s name Drawings of the system Performance under impact Installation Design Notes e.g. DB 80AS/K180S/6m, Easy Rail XS/2,00 Containment Level, Working Width, ASI Test Length Piled in, on structure, anchored on stiffening plate etc. One sided or double sided system, material quality, posts distance, cross section of components, weight, etc. Notes regarding system s installation

8 Transitions acc. to ΕΝV System s name Systems connected with specific transition Drawing plan Is it tested acc. to ENV ? Design e.g. ER-ER Eco e.g. concrete barrier with steel barrier If yes, performance under impact (containment level, working width, ASI) Height, weight, material quality, etc.

9 Terminals acc. to ΕΝV System s name System connected with terminal Drawing plan Is it tested successfully? e.g. Easy Rail P2 profile 2n e.g. Easy Rail If yes, performance under impact (performance class, exit box, permanent lateral displacement, ASI) Design Height, weight, material quality, etc.

10 Crash Cushions acc. to ΕΝ System s name System connected with crash cushion e.g. V100/3:14 VS, SMA 100P e.g. concrete barrier one sided or double sided Drawing plan Shape Design V-shaped system, parallel system Dimensions, volume, weight, material quality, etc.

11 Crash Cushions acc. to ΕΝ Performance under impact Detached parts Restraint level, permanent lateral displacement, exit box, ASI Yes/No Anchorage Foundation frame On reinforced concrete surface free of cracks On asphalt surface Yes/No

12 RBS (Removable Barrier Sections) ΕΝV System s name Drawing plan Anchorage of system terminals Is it tested successfully? Design e.g. Duo Rail Yes/No If yes, performance under impact (containment level, working width, ASI) Test length/installation Dimensions, planning width, opening length, weight, material quality, etc.

13 Evaluation criteria - Requirements: The evaluation requirements they should fulfilled by VRS are divided into two categories : Basic requirements and Requirements related to the installation location of the system

14 Basic requirements: The successful tests of systems according to standard ΕΝ 1317 The modularity of systems

15 Modular systems Consist of the same main components with exception of additional parts Have the same working mechanism during impact Have the same name Benefit: Combinations of different modular systems are compatible with each other

16 Basic requirements : Disposal on the market of transitions and terminals Limited test length L1 As possible small weight No sharp-edged components road safety Detached parts should not have been recorded during impact tests More than one producers for each module

17 Requirements related to the installation location: System s suitability for installation alongside the pavement edge line Impact severity level Α ή Β Compatibility with other certified systems «Compatibility» with existing barriers, e.g. MSO System s suitability for installation in central/lateral reserve Possibility of installation in narrow space conditions

18 Connection of restraint system with existing MSO barrier

19 Requirements related to the installation location : Installation ability of transition with an existing cast in place concrete barrier Installation ability of a system in emergency openings of a central reserve Installation ability of a system on structures and definition of load class acc. to ΕΝ and ΕΝ 1317, parts 2 and 5

20 Evaluation criteria - Systematization: The systematization of VRS evaluation may be acc. to following : x o a The requirement is fulfilled The requirement is fulfilled under certain conditions, e.g. intermediate test length The requirement is not fulfilled The relevant information is not available There is no area of application (e.g. systemν2 in central reserve Η2)

21 Evaluation of requirements: The fulfillment of requirements should be evaluated as green or at least as yellow The test length and weight of safety barriers can be evaluated as «green», when they are small «yellow», when they are medium and «red», when they are big

22 VRS containment level Test length L1 (m) Βάρος (kg) small medium large small medium large Ν H H H4b

23 Conclusions - Proposals: in consequence of the before described it should be prepared a data base of certified systems with: Technical characteristics of Restraint Systems Evaluation lists of VRS acc. to previous mentioned cretiria Systems installation manuals CE certificates Tables include the certified manufacturers of every system

24 This data base should be revised every year by taking into account the rapid changes in the field of development and evolution of certified systems. Also they should be installed modular systems. This way:

25 The numerous types of restraint systems are avoided The suitable restraint systems are selected considering the construction particularities of road sections The number of transitions is minimized Homogeneity on road sections is achieved Replacement, warehousing, and maintenance of systems are easy and simple It is possible to organize and systematize the maintenance in a simple and effective way The maintenance cost of the works is reduced whilst at the same time the levels of road safety are increased

26 Thanks for your attention!