A DISCRETE-ELEMENT METHOD FOR TRANSVERSE VIBRATIONS OF BEAM- COLUMNS RESTING ON LINEARLY ELASTIC OR INELASTIC SUPPORTS

A COMPUTER PROGRAM, DBC5, CAN EFFICIENTLY ANALYZE A BEAM-COLUMN RESTING ON LINEARLY OR NONLINEARLY- ELASTIC, OR NONLINERARLY-INELASTIC SUPPORTS AND SUBJECTED TO EITHER STATIC FIXED LOADS OR DYNAMIC LOADS. THE PATH-DEPENDENT HISTORY OF LOADING OF THE NONLINEARLY-INELASTIC RESISTANCE-DEFLECTION CURVE OF ELEMENT MODELS, WHICH ARE USED TO SIMULATE THE THE SUPPORT IS CONSIDERED IN THIS STUDY. TWO MULTI- NONLINEAR CHARACTERISTICS OF THE INELASTIC RESISTANCE- DEFLECTION CURVES, HAVE BEEN INTRODUCED. FOR PROBLEMS WITH NONLINEARLY-ELASTIC OR NONLINEARLY-INELASTIC SUPPORTS, THE ITERATION PROCESS COMPARES SUCCESSIVELY COMPUTED DEFLECTIONS UNTIL A SPECIFIED TOLERANCE IS SATISFIED. AN OPTION AVAILABLE IN THE PROGRAM ALLOWS A SWITCH FROM A SPRING-LOAD-ITERATION PROCESS (ADJUSTING BOTH THE STIFFNESS AND THE LOAD FROM ONE ITERATION TO THE NEXT, WHICH IS KNOWN AS TANGENT MODULUS METHOD) TO A LOAD-ITERATION TECHNIQUE (ADJUSTING) ONLY THE LOAD) WHEN THE SUPPORTS YIELD OR DISCONNETCT FROM THE BEAM-COLUMN. AN INTERNAL DAMPING FACTOR, WHICH IS RELATED TO THE FIRST TIME DERIVATIVE OF THE CURVATURE OF THE BEAM, HAS BEEN CONSIDERED IN ADDITION TO THE EXTERNAL VISCOUS DAMPING FACTOR WHICH IS NORMAALLY ENCOUNTERED IN A DYNAMIC PROBLEM. THE RESULTS OF AN ANALYSIS CAN INCLUDE: (1) SOLUTIONS FOR THE MEMBER UNDER STATIC FIXED LOADS, (2) SOLUTIONS FOR THE MEMBER UNDER DYNAMIC AND STATIC LOADS AT EACH TIME STATION, AND (3) PLOTS OF COMPUTED DEFLECTIONS OR MOMENTS ALONG EITHER THE TIME OR THE BEAM AXIS AS REQUIRED. A GUIDE FOR DATA INPUT IS PRESENTED WHICH ALLOWS ROUTINE APPLICATION OF THE METHOD OF ANALYSIS WITH LITTLE NECESSARY REFERENCE TO THE BODY OF THE MAIN REPORT. ANY NUMBER OF ANALYSES MAY BE RUN AT THE SAME TIME. /FHWA/

  • Supplemental Notes:
    • RES STUDY 3-5-68-56
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  United States  78701
  • Authors:
    • Hsaio-chieh, CHAN J
    • Matlock, H
  • Publication Date: 1972-6

Media Info

  • Pagination: 246 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208074
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: No 56-24
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 30 1973 12:00AM