Finite Element Modelling Of Cable Median
Barriers Under Vehicular Impacts
Author(s)
J. Bi, H. Fang & D. C. Weggel
Abstract
Cable median barriers (CMBs) are safety devices installed on highway medians
to prevent cross-median crashes. Although fatality rates decrease notably after
installation of CMBs, a small percentage of vehicles are found to under-ride the
CMBs and enter the opposing traffic lanes. Retrofitting the current CMBs could
reduce the number of these events and further increase the reliability of these
barrier systems. Owing to the high cost and restrictions of full-scale physical
crash tests, detailed analysis and parametric studies of CMB designs have been
recently oriented towards numerical modelling of vehicle-barrier impacts. In this
study, a three-strand CMB system installed on a sloped median and impacted by
a passenger vehicle is modelled and evaluated using the nonlinear finite element
(FE) method. Detailed FE models of the CMB and the vehicle are presented.
Various modelling issues involved in the nonlinear FE analysis, such as contact
modelling and numerical instabilities, are discussed. Based on an analysis of
vehicle-barrier interactions using FE simulations, a new CMB design is derived
and its performance is compared to the current design.
Keywords: finite element modelling, cable median barrier, sloped median,
roadside safety, cross-median collisions.
1 Introduction
Highway safety has been a public concern for decades. Over the years,
researchers have developed several types of roadside safety devices including
median barriers for preventing cross-median collisions. Depending on site
Keywords
finite element modelling, cable median barrier, sloped median,
roadside safety, cross-median collisions
Related Book
Other papers in this volume
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