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随着交通流量的增大,疲劳破坏已经成为钢结构桥梁主要考虑的失效模式之一.为了避免疲劳造成的损伤破坏问题,针对新建的一座上承式钢箱拱桥Loukouni桥,选取了拱肋和横撑处的2个典型疲劳构造细节进行了疲劳试验,分析了2种疲劳构造细节的失效模式;针对2种疲劳细节得到了相应的名义应力-寿命曲线,并与各国规范中的曲线进行了比较.结果表明,拟合出的名义应力-寿命曲线与中欧两种规范给出的直线拟合度较高,能够很好地反映疲劳细节的疲劳性能,可应用于类似工程的相关疲劳细节中,为后续桥梁疲劳性能研究提供技术支持.
With the increase of traffic flow, fatigue failure has become one of the main failure modes considered for steel bridges.In order to avoid damage and damage caused by fatigue, aiming at Loukouni Bridge, a new type of steel-framed arch bridge, Fatigue tests were carried out on two typical fatigue structures at the bracing, and the failure modes of the two kinds of fatigue structures were analyzed. Corresponding nominal stress-life curves were obtained for the two kinds of fatigue details, and were compared with those in the national norms The results show that the fitting of the nominal stress-life curve with the straight-line fitting degree given by the two Chinese and European norms can well reflect the fatigue performance of fatigue details and can be applied to the fatigue related details of similar projects , Providing technical support for the research on fatigue performance of subsequent bridges.