DYNAMIC INTERACTIONS BETWEEN MOVING LOADS AND THEIR SUPPORTING STRUCTURES, WITH APPLICATIONS TO AIR CUSHION VEHICLE-GUIDEWAY DESIGN

SEVERAL REALISTIC MODELS OF VEHICLE-GUIDEWAY SYSTEMS ARE FORMULATED AND EVALUATED. EMPHASIS IS ON THE DYNAMIC RESPONSES (DEFLECTIONS AND BENDING MOMENTS) OF GUIDEWAYS DESIGNED FOR AIR CUSHION VEHICLES WITH SPEEDS UP TO 300 MPH. THE FIRST SYSTEM MODELS (CHAPTERS 2 AND 3) INVOLVE VEHICLES WHICH TRANSMIT ONLY CONSTANT PRESSURE TO SIMPLE AND MULTIPLE-SPAN GUIDEWAYS. THERE THE VEHICLE HEAVE ACCELERATION IS ASSUMED TO BE CONTROLLED SO AS TO ELIMINATE VEHICLE MASS INTERACTIONS WITH THE SPANS. RATIOS OF DYNAMIC TO STATIC SPAN RESPONSES WERE FOUND TO EXCEED 2.0 IN SOME CASES. ANOTHER LIMITING CASE IS ASSUMED IN CHAPTER 4, WHERE THE VEHICLES HAVE VERY STIFF SUSPENSION SYSTEMS. THE EFFECTS OF VEHICLE-GUIDEWAY INTERACTIONS IN THIS CASE ARE SEVERE; THAT IS, SPAN DEFLECTIONS MAY BECOME UNBOUNDED FOR A CERTAIN RANGE OF SYSTEM PARAMETERS. IN CHAPTER 5 A SOPHISTICATED SYSTEM MODEL IS COMPLETELY EVALUATED. DOUBLY-SPRUNG, DAMPED MASS SYSTEMS TRANSMIT FLUCTUATING PRESSURES TO THE GUIDEWAYS, WHICH INTERACT ALSO WITH THE VEHICLE. ELEVEN INDEPENDENT SYSTEM PARAMETERS ARE DISTINGUISHED, INCLUDING POST-TENSIONING AND SOIL INTERACTIONS, AND THE EFFECT OF EACH ON GUIDEWAY RESPONSES AND VEHICLE HEAVE ACCELERATIONS IS STUDIED. DESIGN OPTIMIZATION FOR PASSENGER COMFORT IS DISCUSSED. IN CHAPTER 6 THIS SOPHISTICATED SYSTEM MODEL IS USED AS THE DESIGN BASIS FOR A LABORATORY EXPERIMENT TO SIMULATE A PROTOTYPE GROUND TRANSPORTATION SYSTEM.

  • Supplemental Notes:
    • REPT NO FRA-RT-72-27 4 APPS
  • Corporate Authors:

    Duke University

    Department of Civil Engineering
    Durham, NC  United States  27706
  • Authors:
    • Wilson, J F
  • Publication Date: 1971-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 197 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00210007
  • Record Type: Publication
  • Report/Paper Numbers: Final Rpt
  • Files: TRIS
  • Created Date: Apr 11 1974 12:00AM