摘要
为了研究Q690高强度结构钢-超高性能混凝土(UHPC)组合抗剪连接件的疲劳性能,进行了3组共12个推出试件的常幅疲劳试验,考虑了栓钉直径、单钉和群钉布置形式等因素的影响。研究表明:推出试件的疲劳破坏模式均为栓钉剪切断裂;在200万次疲劳寿命下,直径13 mm单钉抗剪连接件的疲劳强度比直径19 mm单钉抗剪连接件的高42.5%,小直径栓钉比大直径栓钉抗剪连接件的疲劳强度高;直径19 mm单钉抗剪连接件的疲劳强度比直径19 mm群钉抗剪连接件的高15.0%,单钉比群钉布置形式下栓钉抗剪连接件的疲劳强度高。将试验结果与国内外已有的普通强度钢-普通混凝土、普通强度钢-UHPC抗剪连接件疲劳数据对比分析表明,Q690高强钢-UHPC抗剪连接件具有更高的疲劳强度,其中比欧洲BS EN 1994-1-1中普通强度钢-普通混凝土抗剪连接件疲劳强度高71.8%。同时,分别提出了单钉布置和群钉布置的Q690高强钢-UHPC抗剪连接件的S-N曲线,供疲劳设计参考。
In order to study the fatigue performance of shear connectors in Q690 high-strength structural steel-ultra high-performance concrete(UHPC) composite beams, three groups of constant-amplitude fatigue tests involving a total of 12 pushout specimens were conducted. The tests considered the influences of stud diameter and arrangement of the studs, i.e., single-stud and group-stud. The results show that the fatigue failure mode of the test specimens is stud shear fracture. At a fatigue life of two million times, the fatigue strength of specimen with 13 mm diameter single-stud was 42.5% greater than that of specimen with 19 mm diameter single-stud, which showed that the smaller diameter stud specimen has higher fatigue strength than the larger diameter stud specimen. The fatigue strength of specimen with 19 mm diametersingle-stud was 15.0% higher than that of specimen with 19 mm diameter group-stud, which showed that the single-stud specimen has higher fatigue strength than the group-stud specimen. Compared with ordinary strength steel-ordinary concrete and ordinary strength steel-UHPC specimens, the shear connectors in the Q690 high-strength steel-UHPC specimen have higher fatigue strength, which was 71.8% higher than the European BS EN 1994-1-1 fatigue strength of ordinary strength steel-ordinary concrete shear connectors. The S-N curve of Q690 high-strength steel-UHPC shear connector with single-stud arrangement was proposed for fatigue design.
作者
童乐为
陈路华
文铭
朱嘉
邵晓东
赵正
TONG Lewei;CHEN Luhua;WEN Ming;ZHU Jia;SHAO Xiaodong;ZHAO Zheng(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Jiaxing Key Laboratory of High-performance and Functional Materials in Civil and Environmental Engineering,Tongji Zhejiang College,Jiaxing 314051,China;Zhejiang Hongri Tenacal New Materials Technology Co.Ltd.,Ningbo 315012,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第1期289-299,共11页
Journal of Building Structures
基金
国家十三五重点研发计划(2017YFC0703402)
浙江省嘉兴市公益性研究计划项目(2020AY10030)。