首页|高强钢板组合单边螺栓抗剪性能试验

高强钢板组合单边螺栓抗剪性能试验

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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fbv 取螺栓最小抗拉强度fbu 的0.40 倍.
Experimental study on the shear performance of high-strength steel plate-composite blind bolts
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(fbu)as the design value of bolt-shear strength(fbv),which is validated as rea-sonable in this study.

shear capacitysteel-plate drilling and tappingpretension forceend distancemicroscopic fracture surfacematching degreeblind boltthread

夏瑞林、段留省、王耀、刘昌永、周天华

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哈尔滨工业大学 土木工程学院,黑龙江 哈尔滨 150090

长安大学 建筑工程学院,陕西 西安 710061

结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),黑龙江 哈尔滨 150090

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

国家自然科学基金陕西省自然科学基金中央高校基本科研业务费专项

517080382018JQ5016300102288102

2024

10.11990/jheu.202202025

哈尔滨工程大学学报
哈尔滨工程大学

哈尔滨工程大学学报

CSTPCD北大核心
影响因子：0.655
ISSN：1006-7043
年,卷(期)：2024.45(6)