摘要
针对U肋内侧增设内隔板的构造形式,开展正交异性钢桥面板足尺模型的静力及疲劳试验,分析内隔板对正交异性钢桥面板连接细节的力学性能及疲劳强度的改善。试验结果表明:内隔板对U肋与横隔板开孔根部连接位置的应力集中改善明显,对其他易发生疲劳破坏的连接细节应力水平亦有所改善,静力分析数值模型计算结果与静力试验结果吻合;常幅疲劳加载至230万次时,在U肋腹板位置发现3条明显的顺桥向裂纹,以距离焊趾10 mm位置的测点应力下降作为判断疲劳破坏的依据,无内隔板U肋腹板连接处疲劳强度高于Eurocode 3和AASHTO所规定的疲劳强度,而受焊接初始缺陷的影响,增加内隔板后U肋腹板连接处疲劳强度高于Eurocode 3而低于AASHTO中所规定的疲劳强度;U肋与横隔板开孔根部的焊缝质量对疲劳裂纹的产生和发展影响显著。
The static and fatigue test of a full-scale orthotropic steel bridge deck was conducted based on the structural form of one inner diaphragm installed in the U-rib. The improvement of the inner diaphragm for the mechanical performance and fatigue strength of the connection details of the orthotropic steel bridge deck was also analyzed. The test results showed that the inner diaphragm can significantly improved the stress concentration of the intersection of the rib to the floor beam（RF）. The improvement for the stress level of other connection details which may be likely to suffer fatigue failure was also slightly effective. After 2. 3 million fatigue cycles,three clear cracks in the longitudinal direction could be found in the web of the U-rib. The decrease of the measured stress 10 mm away from the weld toe was taken as the criteria for the judgment of fatigue failure. The fatigue strength of the RF weld in the web of the U-rib without inner diaphragm was higher than that regulated in Eurocode 3 and AASHTO,while the fatigue strength of the RF weld in the web of the U-rib with an inner diaphragm was higher than that regulated in Eurocode 3 but lower than that regulated in AASHTO. This was mainly affected by the weld defects. Occurrence and expanding of the fatigue cracks of the RF were dramatically affected by the welding quality.
作者
朱爱珠
李牧
田杨
肖海珠
何东升
张晓勇
Zhu Aizhu Li Mu Tian Yang Xiao haizhu He Dongsheng Zhang Xiaoyong(School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China China Railway Major Bridge Reconnaissance ＆ Design Institute Co. Ltd, Wuhan 430056, China)
出处
《钢结构》
北大核心
2017年第1期45-50,共6页
Steel Construction
基金
国家自然科学基金项目(51108204)
中央高校基本科研业务费课题(2016YXMS095)
关键词
正交异性钢桥面板
疲劳试验
疲劳强度
内隔板
orthotropic steel bridge decks
fatigue test
fatigue strength
inner diaphragm
