Road Sensitivity to HGV's Loading State and Tyres Setting



Road Sensitivity to HGV's Loading State and Tyres Setting

Authors

H Arki, Sétra, FR

Description

This article aims to lighten the consequences on road wear of two independent parameters: the number (and configuration) of tyres per axle and the way cargo is distributed on the axles.

Abstract

This article aims to lighten the consequences on road wear of two independent parameters: the number (and configuration) of tyres per axle and the way cargo is distributed on the axles.

Using ALIZE and the French limits of axles load (but obviously not the total load limits), calculations were done for four kinds of roads, thirty-two possibilities combining axles types and number of tyre by axle and various way to distribute the total load on the axles. A French study on the likely consequences of allowing a total load of 52 tonnes for 5 axles-lorries and 57 tonnes for 6 axles-lorries as been used.

Each combination of parameters gave an aggressiveness, which has been compared with the one of a 40 tonnes on 5 axles semi trailer Tridem used as a point of reference.

The range of sensitivities to the number of tyres per axle and the number and repartition of axles can roughly go from 1 to 35.
Influence of the way a lorry is loaded can multiply its aggressiveness as much as by eight.

As French axles load limits differs to the ones foreseen by the European Directive 96/53/EC, this article presents the part dealing with this theme of an European study (Effect of adapting the rules on weights and dimensions of heavy commercial vehicles as established within Directive 96/53/EC). One of the conclusions is that 44 tonnes on 5 axles (semi trailer Tridem) are more aggressive for the road infrastructure than 60 tonnes on 8 axles.


______________________________________________________

Sétra
Sétra is a Technical Department for Transport, Roads and Bridges Engineering and Road Safety of the French ministry of Ecology, Energy, Sustainable Development and Town and Country Planning. As a centre of excellence in infrastructure and transport engineering, Sétra has to produce and spread state of art knowledge and know how.

Sétra?s essential aim is to support national and local authorities in their policies to provide an efficient and safe road network for people and goods, and to develop an integrated and sustainable European transportation system. In all the strategic fields dealing with road, bridges, multimodal and intermodal facilities, it provides expertise, methodologies, guidelines, as well as software and information systems.

Publisher

Association for European Transport