The purpose of this paper is to present the results from the evaluation of the structural integrity, under accident situations, of intermediate buses (intermediate buses are composite buses where the bus body framework -passenger compartment -is mounted on and supported by a separate chassis). For this evaluation a finite element modelling technique and a non-linear structural analysis procedure were used. The finite element analytical model is constructed from the structural drawings and details which are provided by the bus body manufacturer. A description of the bus body construction and design concepts is presented. The non-linear structural analysis procedure uses the matrix method of structural analysis and the concept of plastic hinges in structural frame collapse. The procedure provides a three-dimensional elastic-plastic structural analysis to evaluate the structural strength capacity of bus body structures under quasi-static loading conditions which simulate impact situations, and uses a three-dimensional computer program, EPSAP (elastic-plastic structural analysis program). The method determines the collapse load, deflections characteristics, and energy absorption capacity of bus body structures at collapse. The results for rollover, side impact, and front impact loading conditions are presented graphically as load-deflection diagrams along with the three-dimensional analytical model of the passenger compartment framework showing the sequence of plastic hinge formation, for each loading condition, up to collapse. The collapse load, deflections,and energy absorption capacity are compared to available test standards and modifications of the passenger compartment are recommended accordingly in order to ensure the structural integrity of the vehicle. For the covering abstract of the conference see TRIS 391971. (TRRL)

Media Info

  • Features: Figures; References;
  • Pagination: p. 207-215

Subject/Index Terms

Filing Info

  • Accession Number: 00392000
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-85298-539-8
  • Files: ITRD, TRIS
  • Created Date: Apr 29 1985 12:00AM