00203545

Component

http://onlinepubs.trb.org...s/hrr/1971/343/343-001.pdf

A COMPUTER PROGRAM DEVELOPED TO PREDICT THE BEHAVIOR OF AN AUTOMOBILE STRIKING A PROTECTIVE BARRIER IS DESCRIBED. THE BARRIER IS IDEALIZED AS A STRUCTURAL FRAMEWORK OF ARBITRARY CONFIGURATION AND THE AUTOMOBILE AS A BODY SURROUNDED BY A CUSHION OF SPRINGS. LARGE DISPLACEMENTS AND INELASTIC BEHAVIOR, INCLUDING HYSTERESIS EFFECTS ON UNLOADING, ARE CONSIDERED IN THE BARRIER STRUCTURE. THE AUTOMOBILE SLIDES ALONG THE BARRIER, AND THE EFFECTS OF NORMAL FORCES, FRICTION FORCES, AND WHEEL DRAG FORCES ARE CONSIDERED IN DETERMINING ITS MOTION. INPUT DATA TO THE PROGRAM CONSIST OF THE CONFIGURATION OF THE BARRIER, THE PROPERTIES OF THE BARRIER MEMBERS AND AUTOMOBILE AND THE TRAJECTORY OF THE AUTOMOBILE BEFORE IMPACT. OUTPUT CONSISTS OF TIME HISTORIES OF AUTOMOBILE POSITIONS, VELOCITIES AND ACCELERATIONS, BARRIER DEFLECTIONS, AND BARRIER MEMBER FORCES. THE PROCEDURE USED TO SOLVE THE PROBLEM IS DESCRIBED. THE CAPABILITIES AND LIMITATIONS OF THE PROGRAM ARE DISCUSSED AND RESULTS FOR TWO EXAMPLE BARRIERS ARE PRESENTED. /AUTHOR/

Sponsored by Committee on Traffic Safety Barriers and Sign, Signal and Lighting Supports and presented at the 50th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01410278

pp 1-12

1971

Highway Research Record

50th Annual Meeting of the Highway Research Board

Print

Figures (12) ; References (4)

Acceleration (Mechanics); Automobiles; Barriers (Roads); Computer programs; Deflection; Drag; Force; Friction; Impacts; Inelastic stress; Output; Time and motion studies; Velocity

Barriers; Data; Inelastic action; Input; Interaction

Design; Highways

TRIS, TRB

Jul 25 1971 12:00AM

• CRASH TEST PERFORMANCE OF A PROTOTYPE LIGHTWEIGHT CONCRETE ENERGY-ABSORBING GUARDRAIL SYSTEM
• DYNAMIC EVALUATION OF TIMBER POSTS FOR HIGHWAY GUARDRAILS
• DYNAMIC TESTS OF AN ENERGY-ABSORBING BARRIER EMPLOYING STEEL DRUMS
• DYNAMIC TESTS OF AN ENERGY-ABSORBING BARRIER EMPLOYING WATER-FILLED CELLS
• Dynamic Tests of the California Type 20 Bridge Barrier Rail
• EVALUATION OF TIMBER WEAK-POST GUARDRAIL SYSTEMS
• PERFORMANCE OF THE HI-DRO CUSHION CELL BARRIER VEHICLE-IMPACT ATTENUATOR
• SCALE-MODEL TEST OF AN ENERGY-ABSORBING BARRIER
• WATER-PLASTIC CRASH ATTENUATION SYSTEM: TEST PERFORMANCE AND MODEL PREDICTION