摘要
为研究高强钢板组合单边螺栓抗剪承载力和破坏机理,本文对29个试件进行试验研究。钢材选用Q345B和Q460C,高强螺栓选用10.9级和12.9级2种等级和M20、M24、M27、M30、M33这5种规格。试验显示出螺杆剪断和钢板破坏2种破坏模式。结果表明:螺栓预拉力对极限抗剪承载力影响较小而对峰值位移影响较大,钢板破坏时,有预拉力试件的峰值位移比无预拉力反而增加40%。本文试验范围内,12.9级螺栓与Q460C匹配时,抗剪承载力最优,充分的发挥高强钢材的强度,与Q345B匹配时,变形能力较好;10.9级螺栓与Q460C匹配时峰值位移最小,与Q345B匹配时,抗剪承载力最低;抗剪承载力与端距呈正相关。钢板组合单边螺栓连接梁柱节点时,其端距仍可采用标准规定的最小端距进行设计计算。建议螺栓抗剪强度设计值f_(v)^(b)取螺栓最小抗拉强度f_(u)^(b)的0.40倍。
To investigate the shear bearing capacity and failure mechanism of a high-strength steel plate-composite blind bolt,experiments were conducted on 29 specimens.Two types of steel,Q345B and Q460C,were selected,along with two grades of high-strength bolts,namely,10.9 and 12.9,and five specifications,namely,M20,M24,M27,M30,and M33.The experiments revealed two failure modes:bolt-shear failure and steel-plate failure.The results indicate that the pretension of bolts has a minor effect on the ultimate shear bearing capacity but a significant effect on peak displacement.When the steel plate fails,specimens with pretension exhibit a 40% increase in peak displacement compared with those without pretension.Within the scope of this experiment,the combination of 12.9-grade bolts with Q460 steel yielded the optimal shear bearing capacity,fully leveraging the strength of high-strength steel while exhibiting better deformation capability with Q345 steel.The combination of 10.9-grade bolts with Q460 steel resulted in the smallest peak displacement,whereas those with Q345 steel resulted in the lowest shear bearing capacity.Shear bearing capacity is positively correlated with edge distance.When connecting beam-column joints with steel plate-composite single-sided bolted connections,the edge distance can still be designed and calculated using the minimum edge distance specified in the standard.It is recommended to use 0.40 times the minimum tensile strength of bolts(f■) as the design value of bolt-shear strength(f■),which is validated as reasonable in this study.
作者
夏瑞林
段留省
王耀
刘昌永
周天华
XIA Ruilin;DUAN Liusheng;WANG Yao;LIU Changyong;ZHOU Tianhua(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Chang′an University,Xi′an 710061,China;Key Lab of Structures Dynamic Behaviour and Control(Harbin Institute of Technology),Ministry of Education,Harbin 150090,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2024年第6期1050-1057,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51708038)
陕西省自然科学基金项目(2018JQ5016)
中央高校基本科研业务费项目(300102288102)。
关键词
抗剪承载力
钢板攻丝
预拉力
端距
微观断口
匹配度
单边螺栓
螺纹
shear capacity
steel-plate drilling and tapping
pretension force
end distance
microscopic fracture surface
matching degree
blind bolt
thread
作者简介
夏瑞林,男,博士研究生;通信作者:段留省,男,高级工程师,E-mail:duanliusheng@126.com.
