UHPC提升钢桥面板顶板-纵肋连接疲劳性能研究OA

The finite element method was used to analyze the wheel load stress response of four typical details of deck-to-rib junction of orthotropic steel bridge deck with and without UHPC pavement,and the improvement effect of UHPC pavement layer on its fatigue performance was studied.The research results indicate that in the absence of rigid pavement,the most unfavorable stresses for details HG,HZ,HL,DG,DZ,and DL are-103.5 MPa,-56.8 MPa,8.9 MPa,-92 MPa,-97.5 MPa,and-62.5 MPa,respectively.When 50 mm thick UHPC pavement was used,the most unfavorable stresses of details decreased to-7.9 MPa,-9.5 MPa,-8.3 MPa,9.0 MPa,7.5 MPa,and-14.4 MPa,respectively.The UHPC pavement layer significantly improves the fatigue performance of deck-to-rib junction of orthotropic steel bridge deck.The wheel load of details is less than the fatigue cutoff limit,and there is no risk of fatigue cracking.