Fatigue Life Prediction of Vulnerable Welded Joints in Steel Deck of Mingzhuwan Bridge
Determining the fatigue life of fatigue vulnerable parts of orthotropic steel bridge decks under reciprocating vehicle loads can provide a reference for routine maintenance and avoid the occur-rence of fatigue damage.Firstly,a finite element model of the orthotropic steel deck section of the Mingzhuwan Bridge was established,and the application of a moving vehicle load model was achieved using the Dload subroutine.The stress histories of three vulnerable parts were determined.Then,the fatigue stress frequency spectrum of vulnerable parts was obtained by writing a rain flow counting meth-od program.Finally,based on the hot spot stress method and the critical distance theory,the fatigue life of vulnerable parts was predicted.The results show that under vehicle load,the stress at the U-rib to floor beam connection in the steel bridge deck is the most unfavorable,and the predicted fatigue life is only 23 years.It is the most prone location for fatigue cracking in the steel bridge deck of the Mingzhu-wan Bridge,and special attentions should be paid during daily inspections,while the U-rib to deck con-nection and the arc opening of the floor beam will not undergo fatigue cracking during the design refer-ence period.
orthotropic steel bridge decksfatigue lifevehicle loadsthe hot spot stress methodthe critical distance theory
万方数据
维普
