摘要
正交异性钢桥面板因构造与受力复杂特殊、加工工艺繁琐、焊缝数量众多,且关于其疲劳性能的试验研究还相对不够充分,以致不能完全适应当代钢桥发展与建造的需求。本文以某大跨度悬索桥的正交异性钢桥面板为工程背景,开展1:2缩尺的大节段模型疲劳试验,研究正交异性钢桥面板其关键细节的疲劳性能,以期望丰富我国正交异性钢桥面板疲劳试验的数据库。结果发现:对称测点其所测试数据与加载关系曲线出现对称特征;静态加载试验过程中,测点加载与卸载曲线比较对称且有良好的可恢复性;6#苹果形开孔右上侧出现疲劳裂纹,疲劳循环次数达到200万次时其长度约为7.5mm,260万次时扩展至31mm左右,裂纹扩展率随荷载增加而增大,而其余部位未发现疲劳裂纹的产生。
Due to thespecial construction and stress,complicated processing technology and large number of welds,the experimental study on the fatigue properties of orthotropic steel bridge panels is not sufficient to meet the needs of the development and construction of steel bridges.Based on the engineering background of the orthotropic steel deck of a large-span suspension bridge,the fatigue performance of the 1:2-scaled large-segment model was studied,and it focused on the fatigue performance of the key details of the orthotropic steel bridge panels,to enrich the database of fatigue tests of orthotropic steel bridge decks in China.The results showed that:the measured data and the loading curve of the symmetrical measuring point had symmetrical characteristics;during the static loading test,the loading and unloading curves of the measuring point were symmetrical and had good recoverability;6# apple-shaped hole had fatigue crack on the upper right side,when the number of fatigue cycles reached 2 million,the length was about 7.5 mm,and when it was 2.6 million,it extended to about 31 mm,also the crack growth rate increased with the load,and no fatigue cracks were found in the rest of the parts.
作者
曾勇
杨长春
渠昱
谭红梅
Zeng Yong;Yang Changchun;Qu Yu;Tan Hongmei(State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong University,400074 China;Mountain Bridge and Materials Engineering Research Center of Ministry of Education Chongqing Jiaotong University,400074 China)
出处
《特种结构》
2020年第6期19-24,共6页
Special Structures
基金
重庆市留学人员回国创业创新支持基金(cx2018113)
山区桥梁及隧道工程国家重点实验室开放基金(CQSLBF-Y14-3,CQSLBF-Y16-10)
山区桥梁结构与材料教育部工程研究中心开放基金资助(QLGCZX-JJ2017-5)。
