【作者】 余启明； 何晓鸣； 刘泽宇； 夏磊； 姜曼； 李尚松；

【Author】 YU Qiming1, HE Xiaoming1, LIU Zeyu2, XIA Lei2, JIANG Man2, LI Shangsong2 (1.School of Civil Engneering and Architecture, Wuhan Polytechnic Universitym, Wuhan 430023, China; 2.Wuhan Highway Survey and Design Institute, Wuhan 430015, China)

【机构】 武汉工业学院土建学院； 武汉市公路勘察设计院；

【摘要】 由于桥梁结构中存在固有不可避免的缺陷,这些缺陷或者是由制造加工过程中引起的,或者是桥梁服役过程中由于疲劳而产生的损伤,还可能是由于受到冲击荷载而产生的裂纹。裂纹的扩展、失稳会导致桥梁承载能力下降甚至完全丧失而造成严重事故。材料由于在各种复杂的环境下服役,定量设计方法必需基于断裂力学理论和相关断裂韧度指标。通过试验研究了桥梁结构钢材的CTOD试件疲劳裂纹预制过程以及特点,所得结果将为桥梁用钢的使用提供了重要的试验依据和计算基础。依据英国标准BS7448断裂韧度试验标准和DNV-OS-C401,对桥梁常用钢Q370qE进行了CTOD(裂纹尖端张开位移)疲劳裂纹预制试验,分别测试了不同厚度的母材疲劳裂纹扩展情况,并对试验结果进行了分析,得出相应的结论。更多还原

【Abstract】 Because in the bridge structure there are inevitable defects, which are probably made during the manufacture, or due to the fatigue during the servicing process and might also coursed by impact load. Crack’s extension and instability will cause severe accidentresult as the decrease of bridge’s carrying capacity or it’s completely lost. Because of bridge steel services under the complex environment, quantitative design method must based in fracture mechanics theory and related fracture toughness standard. This dissertation through the text study the CTOD specimen’s fatigue crack prefabricated process of bridge steel and its’characteristics, and its’ results will provide the important experimental basis and computation basis. According to the BS7448 fracture toughness test standard this dissertation conducted a CTOD (crack tip opening displacement) fatigue crack precast test with the used steel Q370qE in bridge. Respectively tested different thickness mather materials’ condition of fatigue crack, and analysis the test’s results, thus obtained the related conclusions.更多还原