Analysis of Fatigue Truck Model for LRFD Code

LRFD 설계기준(안) 피로설계트럭 모형 분석

  • 조은영 (명지대학교 토목환경공학과) ;
  • 신동구 (명지대학교 토목환경공학과)
  • Received : 2008.11.04
  • Accepted : 2009.05.21
  • Published : 2009.06.27

Abstract

A reliability analysis of the fatigue failure of highway steel bridges was performed by applying the Miner's fatigue damage rule for the fatigue design truck proposed for the LRFD code and for the current DB 24 truck. The limit state function for fatigue failure is expressed as a function of various random variables that affect fatigue damage. Among these variables, the statistical parameters for the equivalent moment, the impact factor, and the loadometer were obtained by analyzing recently measured domestic traffic data, and the parameters for the fatigue strength, the girder distribution factor, and the headway factor were obtained from the measured data reported in literature. Based on the reliability analysis, the fatigue truck model for the LRFD code was proposed. After applying the proposed fatigue truck to the LRFD code, 16 composite plate and box girder bridges were designed based on the LRFD method, and the LRFD design results for the fatigue limit state were compared with those by the current KHBDC.

Acknowledgement

Supported by : 교량설계핵심기술연구단

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