Fatigue tests and fatigue assessment approaches for rib-to-diaphragm in steel orthotropic decks
Fatigue tests and fatigue assessment approaches for rib-to-diaphragm in steel orthotropic decks
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钢正交各向异性桥面板肋至隔板的疲劳试验和疲劳评估方法
DOI：
10.1016/j.jcsr.2015.07.014
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发表时间：
2015-11-01
影响因子：
4.1
通讯作者：
Ye, Hua-Wen
中科院分区：
文献类型：
--
作者：
Zhang, Qing-Hua;Cui, Chuang;Ye, Hua-Wen
在正交各向异性钢甲板中，肋-隔膜焊接接头是最容易产生疲劳的细节之一。由于其复杂的局部应力条件和疲劳开裂机理，连接的抗疲劳性能和评价是需要解决的难题。对全尺寸正交各向异性钢甲板进行了疲劳试验，重点确定了实际疲劳抗力，并验证了疲劳评估方法对肋-隔板节点的适用性。引入了热点应力法和有效缺口应力法，缓解了疲劳抗力评估的困难，并将评估结果与一致标称应力法和模型试验进行了比较。对试样进行有限元分析，以补充实验室测试，并提供有关目标细节疲劳行为的额外信息。热点应力法和缺口应力法的评价结果与模型试验的相关性优于一致名义应力法。结果表明，肋-膜片焊接接头的疲劳强度可采用热点应力法或缺口应力法进行评估，其S-N曲线对应于疲劳强度设计等级FAT90 （2 × 10(6)次循环应力范围为90 MPa，生存概率P-s = 97.7%）或FAT225。评价结果差异显著的主要原因是能否准确模拟局部应力状态。这些研究对正交异性钢甲板的关键疲劳细节的疲劳强度有了深入的了解。(C) 2015 Elsevier Ltd.版权所有。
In orthotropic steel decks, a rib-to-diaphragm welded joint was one of the most vulnerable details prone to fatigue. Fatigue resistance and evaluation of the connection are challenges to be dealt with, due to a complicated local stress condition and fatigue cracking mechanism. Fatigue tests of full-scale orthotropic steel decks were carried out focusing on determining actual fatigue resistance and demonstrating the applicability of the fatigue assessment approaches for rib-to-diaphragm joints. Hot spot stress as well as the effective notch stress approaches were introduced to alleviate the difficulties of fatigue resistance assessment, and the evaluation results were compared with consistent nominal stress approach and model tests. Finite element analyses of the test specimen were performed to supplement the laboratory testing and provide additional information on the fatigue behavior of the targeted detail. The evaluation results of hot spot stress and notch stress approaches correlated with model tests better than consistent nominal stress approach. The results indicated that fatigue strength of the rib-to-diaphragm welded joints could be evaluated by hot spot stress or notch stress approaches with a single S-N curve corresponding to fatigue strength design class FAT90 (a stress range of 90 MPa at 2 x 10(6) cycles with a survival probability P-s = 97.7%) or FAT225. The main reason lying behind the notable divergence in evaluation results was whether local stress condition could be accurately simulated or not. The investigations gave an insight into the fatigue strength of key fatigue details in orthotropic-steel decks. (C) 2015 Elsevier Ltd. All rights reserved.