A new analytical procedure is developed to predict the dynamic response of axially restrained beams to intense pulse loads. The beams are assumed to have doubly symmetric cross-sections and to obey a rigid-plastic material law. The moment-axial force interaction relation for the beam section is approximated by a straight line. This uncouples the response into two distinct phases -an initial bending-only phase involving plastic hinge mechanisms, followed by a plastic string phase. Both these phases are governed by linear differential equations, and hence the response to arbitrary load pulses may be solved in closed form. The results for beams subjected to a rectangular load pulse compare very well with those from more exact solutions. Finally, results are presented for an arbitrary cross-section beam subjected to a triangular shaped pulse with a finite rise time. The effect of rise time is found to be very small for rise times less than 0.3 of the total pulse length. (a)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Schubak, R B
    • Anderson, D L
    • Olson, M D
  • Publication Date: 1989


  • English

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Filing Info

  • Accession Number: 00492952
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 31 1990 12:00AM