In order to analyze the fatigue performance of T-type stiffened rib steel roof plate-fiber concrete combination bridge deck,this paper takes a continuous steel box girder bridge with T-type stiffened rib steel roof plate-fiber con-crete combination bridge deck system as an example,designs the fatigue performance test of the local footing model and establishes the finite element model.On the basis of verifying the correctness of the finite element model,the most un-favorable location of the fatigue details of the combined bridge deck is determined through the calculation of the finite element model,and the stiffness,hotspot stress and stress concentration coefficient of the most unfavorable location of the fatigue details are compared to analyze the influence of the concrete deck slab and the arrangement of the pegs on the fatigue performance of the combined bridge deck.The research results are as follows.Through the measured data of local foot-scale model test,it is verified that the relative error of the finite element simulation method does not exceed 10%,which has good accuracy;compared with the pure steel T-type reinforced rib steel bridge panel specimen model without concrete plate,the overall stiffness of the concrete deck specimen is higher,and the hot-spot stresses of each fatigue detail are greatly reduced;the"staggered welding"method is adopted;and the"staggered welding"method is adopted.The"wrong welding"bolting arrangement can effectively reduce the stress concentration coefficient at the double-sided fillet weld between the steel top plate and the T-rib,with a maximum reduction of nearly 20%,and it is suggested that the bridge deck bolts should be avoided to be"positively welded"above the T-rib in the actual project.
关键词
钢顶板-纤维混凝土组合桥面板/T型加劲肋/疲劳性能/有限元分析
Key words
steel-concrete composite bridge deck/T-ribs/fatigue performance/finite element analysis
维普
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