SIMULATION OF ROLLING LOADS ON THE GEPFORD OVERHEAD BRIDGE SECTION. INTERIM REPORT

Internal forces and deformations in highway bridges under moving vehicle loads can be far greater than those due to the same loads applied statically. The analysis of structures subject to moving loads is complicated by the uneven riding surface, large mass of the moving vehicle relative to that of the bridge structure and the interaction between the motions of the bridge and the vehicle suspension. In laboratory bridge tests, it is customary to apply static, quasi-static or cyclic concentrated loads to large or full-scale test specimens to investigate service and overload limit states. However, the impact of moving loads at various speeds and their interaction with the dynamic characteristics of the bridge structure are either neglected or as in the current bridge design codes, empirically added. The servo-controlled multi-actuator system in the Charles Lee Powell Structural Systems Laboratory at the University of California at San Diego permits the application of simulated rolling loads through a series of computer controlled actuators along the length of a bridge structure. These actuators can be programmed to simulate rolling loads travelling at varying speeds across the bridge deck. This allows the full-scale evaluation of the influence of speed and vehicle-structure interaction on the dynamic response of the bridge section under controlled laboratory conditions. This report discusses the simulation of rolling loads on the deck of the Gepford Overhead Bridge section utilizing a time programmed series of servo-controlled actuators and parallel analytical studies of the dynamic response to moving loads at various speeds. A test method was developed to simulate fatigue type rolling loads for laboratory tests. A procedure to calibrate numerical models with the aid of experimental dynamic response data was established to study the response of bridge structures to moving loads inclusive of vehicle-structure interaction effects.

  • Corporate Authors:

    University of California, San Diego

    Department of Applied Mechanics and Engineering Sciences
    La Jolla, CA  United States  92093-0085

    California Department of Transportation

    Division of Structures, 1801 30th Street
    Sacramento, CA  United States  94272-0001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Seible, F
    • Priestley, MJN
    • Krishnan, K
    • Nagy, G
    • Sharabi, N
  • Publication Date: 1990-10

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 47 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00621723
  • Record Type: Publication
  • Report/Paper Numbers: UCSD/SSRP-90/05
  • Contract Numbers: F85SD19
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 30 1996 12:00AM