5. EVU – Tagung Verkehrssicherheit in Österreich - EVU e.V.

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5. EVU – Tagung Verkehrssicherheit in Österreich 07. März 2008, Wien analyzed. Thereby limits concerning EN 12767 as well as EN 12899-1 have to be defined. After having done a lot of simulations, real crash tests have been performed, to see, if the sign posts and sign structures behave similar to the virtual analysis. Summarized, the new type of the sign posts and sign structures system have been design with smart behave in case of impact, improving passive safety of the post, and strong enough to resist environment loads. Participants of the whole project. � WIMED Poland - Technical Department � TU Graz Vehicle Safety Institute � DSD – Dr. Steffan Datentechnik GesmbH, Linz � Institute of Forensic Research, Krakow � Warsaw University of Technology � Krakow’s Institute of Technology WIMED Poland - Producers of Road Signs and Safety Devices in Poland. WIMED’s vision is to improve the visual effectiveness of traffic signs for road users and reduce casualty severity upon impact with road infrastructure. WIMED is a modern and fast-growing company manufacturing and installing a full range of road signs, gantries and other traffic equipment. It is a company with many years of tradition, experience and service behind it. WIMED has been working in the vertical road traffic signage industry for nearly twenty years. Recent years have shown an increased interest in a clearly new approach in Europe, which heads towards performance specification, especially through the introduction of harmonised European Standards such as EN 12899-1 and EN 12767. WIMED is focused on being up to date with this new approach, particularly in relation to road safety. A vast number of road traffic signs of various sizes are mounted alongside local roads and motorways. This poses an increased threat to road user safety due to the large number of crashes involving vehicles colliding with road side structures. The challenge within the industry is to reduce both the number of crashes and their severity. The new traffic sign post system from WIMED – “PROLIFE” – profile for life – is the result of many years of research and experience and a forward looking approach to the need to design for the increased requirements of wind resistance and more crash friendly infrastructure. One of the challenges encountered during the “PROLIFE” research process was strength versus safety, as represented by EN 12899-1 and EN 12767, more wind load means greater impact resistance. The perfect solution has been found and proven during the following stage of the project. DĄBCZYŃSKI, Zdzisław – Collisions with sign post and sign structures Seite 22
5. EVU – Tagung Verkehrssicherheit in Österreich 07. März 2008, Wien The main advantages of the “PROLIFE” system are: • New, more cost-effective profiles that can be used to support road traffic signs of most sizes. • New open profile provides greater wind load resistance and a more forgiving structure in the event of a collision. • Different combinations of supports can be produced using the same profile. • The characteristic profile is easily recognized, reducing the likelihood of theft. Model Building The first idea of the new post came from Z. Dabczynski, founder of WIMED; firstly improve by specialist from Technical Department of WIMED. Understanding wide range of the problem it was decided to start with scientifically based experts in the field of road and car safety. The TU Graz Vehicle Safety Institute was chosen as partner for verification of the shape and usefulness basic profile for all expected proposes. Mesh Generation First of all, a finite element model has been generated. Based on drawings of the shape, and measurements that have been done at the hardware poles, the geometry has been meshed. Beginning from the contour-lines of the cross section first a line-mesh has been generated, which later has been extruded along the longitudinal axis of the pole. Thereby the mid-surface of the shape has been meshed with shell elements. Thereby an average element size of approx. 10 mm (length of edge) was used. Figure 2: Different impact directions of the car Figure1: Creating shell elements Using this element size, a single pole with a length of 4.5 m was described by approx. 41500 elements. These values have been compared with an impact against a pillar with circular shape. The pillar was modelled with an outer diameter of 60 mm and a thickness of 3.2 mm. The material properties have not been changed, and also the method of fixing the sign to the pole was the same. The following figure shows the configuration of these 4 simulations. The numbering of the simulations have been done for analysis on many different structures, sizes and crashes. DĄBCZYŃSKI, Zdzisław – Collisions with sign post and sign structures Seite 23
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5. EVU – Tagung Verkehrssicherheit in Österreich - EVU e.V.

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