摘要
Abstract
Orthotropic plate is widely used in all kinds of bridges because of its light weight,large bearing capacity,fast con-struction speed,low maintenance cost and so on.However,its excellent performance corresponds to the fatigue problems caused by complex structure and numerous welds,which further affect the safety,applicability and durability of the structure.In this paper,taking a two-span continuous steel box girder bridge as the engineering background,the Midas-civil beam element model of the whole bridge is established,and the Ansys segment sub-model is established by using the sub-model technology.The fatigue load model Ⅲ in the Code is used to load the orthotropic plate of steel box girder,and the stress history of three fatigue concerns is obtained.Finally,the stress spectra of three concerns are obtained by rain flow counting method.According to Miner's linear cu-mulative damage theory,the fatigue life of the three concerns is predicted to be more than 100 years,which meets the design re-quirements.关键词
正交异性钢桥面板/有限元/寿命预测/疲劳/应力Key words
orthotropic steel bridge deck/finite element/life prediction/fatigue/stress分类
交通工程
