UHPC短焊钉推出试验与抗剪机理参数分析  

Push-Out Test and Mechanism Analysis of Short Headed Stud in UHPC Composite Deck

作　　者：张乐朋 徐晨[1] 侯哲豪 马骉[2] 徐艺 ZHANG Lepeng;XU Chen;HOU Zhehao;MA Biao;XU Yi(Department of Bridge Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学桥梁工程系,上海200092 [2]上海市政工程设计研究院(集团)有限公司,上海200092

出　　处：《结构工程师》2022年第5期73-83,共11页Structural Engineers

基　　金：国家自然科学基金资助项目(51978501)。

摘　　要：针对超高性能混凝土(UHPC)组合桥面板中短焊钉高度及焊钉间距对焊钉抗剪性能影响规律以及超薄UHPC板推出试件受力特征等问题,以宁波西洪大桥接线工程为背景,进行了薄板UHPC短焊钉推出试验、有限元模拟和参数化分析工作。试验表明:UHPC短焊钉破坏模式主要表现为短焊钉根部剪断,UHPC出现局部碎裂;沿推出方向的上、下排焊钉钉身所承担的拉弯应力比存在显著差异。参数分析表明:直径13 mm的焊钉钉高在15~50 mm变化时,钉高降低,焊钉抗剪刚度有增大趋势,极限状态中逐渐出现焊钉拉拔变形,周边UHPC的损伤区域变大,但并未显著影响焊钉的极限承载力;另一方面,焊钉间距在150~300 mm变化时未对焊钉抗剪性能产生显著影响。To study the influence of stud height and stud spacing on the shear behavior of short headed studs in ultra-high performance concrete(UHPC)composite deck,the connection project of Xihong Bridge was taken as the engineering background and push-out test and FEM parametric analysis were conducted. The push-out test revealed that the failure mode of short stud in UHPC was shear failure at the root of stud,and there was only partial crush in UHPC. The push-out test also found that there was a significant difference between the tensile and bending stress ratios of the upper and lower rows of studs along the load direction.According to the FEM analysis,shear rigidity tends to increase with the decrease of stud height when the stud height of 13 mm diameter stud ranges from 15 mm to 50 mm. When stud height decreases,stud will be pulled out and the crush area of UHPC will become larger. However,stud height has little impact on shear capacity of short headed stud. On the other side,stud spacing does not have significant influence on shear performance of short studs when changing in the range from 150 mm to 300 mm.

关 键 词：超高性能混凝土(UHPC)组合桥面板 短焊钉连接件 推出试验 有限元模拟 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]