Dinamična analiza deformiranja cestne varnostne ograje pri naletu vozila

Matej Vesenjak (Author), Zoran Ren (Author)

Abstract

V prispevku je obravnavana dinamična analiza jeklene cestne varnostne ograje. Slednja se uporablja na javnih cestah za preprečitev zdrsa vozila s cestišča ali preboja na nasprotni vozni pas. Evropski standard EN 1317 podaja natančna merila, ki jih mora izpolnjevati ograja. Dosedanje raziskave so pokazale, da je sedanja cestna varnostna ograja pri naletu vozila pretoga, kar ima za posledico prevelike pojemke pri naletu vozila. Na togost ograje ima v začetni fazi trka vozila ob varnostno ograjo najveèji vpliv distanènik. Namen raziskave je oblikovanje novega distančnika, ki bo zmozen povečane absorpcije energije trka in s tem nadzorovane deformacije pri naletu vozil. Ustreznost novih oblik distančnika je bila preverjena z dinamičnimi nelinearnimi (materialna, geometrijska in strukturna nelinearnost) analizami trirazseznega modela varnostne ograje po metodi konènih elementov. Rezultati računalniskih simulacij kazejo, da je sedanji distančnik pretog in da lahko z drugačnimi oblikami distančnikov povečamo zmožnost elasto-plastičnega deformiranja in s tem absorpcijo energije trka ter tako posredno zmanjšamo pojemke potnikov v vozilih med trkom in povečamo cestno varnost.

Keywords

analize dinamične;dinamična analiza;ograje varnostne;similacije;simuliranje nelinearno;simuliranje numerično;varnost na cestah;varnostne ograje;zdrs

Data

Language:	Slovenian
Year of publishing:	2003
Typology:	1.04 - Professional Article
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	Association of Mechanical Engineers and Technicians of Slovenia et al.
UDC:	625.745.5:692.88:656.089.2:62-783.3
COBISS:	7074843
ISSN:	0039-2480
Parent publication:	Strojniški vestnik
Views:	661
Downloads:	37
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Dynamic analysis of a road restraint system's deformation resulting from a vehicle impact
Secondary abstract:	This paper describes a dynamic analysis of a steel road-restraint system that is used on public roads to prevent a vehicle from veering off the road or breaking through to the opposite side of the road. The European standard EN 1317 provides the exact criteria that the road-restraint system has to fulfill. Practical observations of installed systems indicate that the currentdistance spacer is too stiff, which results in unacceptable decelerations during vehicle impact. The stiffness of the restraint system in the initial phase of the crash is largely attributed to the distance-spacer design. The purpose of this research was to evaluate new designs of the distance spacer with increased crash-energy absorption due to a more controlled deformation during vehicle impact. The stiffness of various designswas evaluated with nonlinear dynamic (material, geometric and structural-contact nonlinearity) analysis of a three-dimensional road-restraint system within the framework of the finite-element method. The computational analyses prove that the currently used distance spacer is indeedfar too stiff and that the new designs ensure controllable elasto-plastic deformation and absorb more crash energy, which in turn reduces decelerations during the impact and increases the safety of road users.
Secondary keywords:	roadside safety;road restraint barriers;dynamic analysis;numerical simulations;neolinear simulations;varnost na cestah;ograje varnostne;analize dinamične;simuliranje numerično;simuliranje nelinearno;
URN:	URN:NBN:SI
Type (COBISS):	Not categorized
Pages:	str. 586-592
Volume:	ǂLetn. ǂ49
Issue:	ǂšt. ǂ12
Chronology:	2003
ID:	1746056