Fatigue Performance of Orthotropic Steel Bridge Decks with Inner Diaphragm in U-rib
Fatigue Performance of Orthotropic Steel Bridge Decks with Inner Diaphragm in U-rib
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发表时间：
2014
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通讯作者：
Gu Pin
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作者：
Gu Pin
根据铁路钢质桥面的具体结构细节，对u型肋正交各向异性钢桥面的疲劳性能进行了研究。在静荷载和高循环荷载作用下，对u型肋内隔板的DECK1和不带内隔板的DECK2两个足尺试件进行了测试。试验结果表明，u型肋内隔板有助于肋腹板应力和横梁横隔板应力的重新分布，从而提高正交异性钢铁道桥面肋-横隔板构件的疲劳强度。疲劳裂纹很可能是从肋-隔板焊缝的脚趾处开始的，两个试样在靠近肋-隔板连接处的肋腹中都出现了水平裂纹。建立了甲板的有限元模型，计算结果与试验结果吻合较好。分析了u型肋内隔板对桥面受力状态和疲劳性能的影响。
Fatigue performance of orthotropic steel decks with U-rib was investigated based on the specific constructional detailing of the steel railway decks.Two full scale specimens,DECK1 which had the inner diaphragms in the U-ribs,and DECK2 which did not have the inner diaphragms were tested under the static loading and the high cycled loading.Test results show that inner diaphragms in the U-ribs help to redistribute stress in web of the rib and stress in diaphragm of the crossbeam,and hence to improve the fatigue strength of rib-to-diaphragm detail in the orthotropic steel railway decks.Fatigue cracks initiates very likely from the toe of the rib-todiaphragm welds,and both specimens develop horizontal cracks in the web of rib at the position close to the rib-todiaphragm connections.Finite element(FE)model of the decks is developed and the results agree well with the test results.Influences of the inner diaphragms in the U-ribs on the stress state and the fatigue performance of the deck were analyzed.