摘要
为了研究非接触式测量技术检测高强螺栓预紧力的可行性,以8.8级M16高强螺栓为研究对象,采用有限元软件对高强螺栓施加预紧力进行了模拟,分析了不同螺栓预紧力下螺帽表面应变分布。通过电阻应变片检测试验测量了高强螺栓施加预紧力过程中的螺帽表面应变,将测量结果与模拟结果进行对比,验证了有限元模拟的正确性和螺栓预紧力与螺帽表面应变之间的线性关系。采用三维数字图像相关法检测了高强螺栓预紧力施加过程中的螺帽表面应变,并与有限元分析结果进行了对比。最后,采用正态分布完全样本可靠度置信下限计算方法得到了20%失效概率、50%置信度下的8.8级M16高强螺栓螺帽表面应变检测目标值。结果表明:采用三维数字图像相关法通过检测螺帽表面应变从而确定高强螺栓预紧力理论上是可行的。
In order to study the feasibility of non-contact measurement technology to detect the pre-tightening force of high-strength bolts,the 8.8 grade M16 high-strength bolts were taken as the research object,and the pre-tightening force of high-strength bolts was simulated by finite element software.The strain distribution on the nut surface under different bolt pre-tightening forces was analyzed.The surface strain of the nut during the pre-tightening force of the high-strength bolt was measured by the resistance strain gauge test.The measurement results were compared with the simulation results to verify the correctness of the finite element simulation and the linear relationship between the bolt pre-tightening force and the surface strain of the nut.The three-dimensional digital image correlation method was used to detect the surface strain of the nut during the pre-tightening force of the high-strength bolt,and the results were compared with the finite element analysis results.Finally,the target values of surface strain detection of 8.8 grade M16 high-strength bolt nut under 20%failure probability and 50%confidence were obtained by using the calculation method of lower confidence limit of complete sample reliability of normal distribution.The results show that it is theoretically feasible to use the three-dimensional digital image correlation method to determine the pre-tightening force of high-strength bolts by detecting the surface strain of the nut.
作者
夏凯峰
石和杰
李涛
XIA Kaifeng;SHI Hejie;LI Tao(Wuhan Branch of CRCC Harbour&Channel Engineering Bureau Group Co.,Ltd,Wuhan 430013,Hubei,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,Hubei,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2024年第5期93-101,共9页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51908437)。
关键词
三维数字图像相关法
高强螺栓
预紧力
表面应变
非接触式测量
3D-digital image correlation method
high-strength bolt
pre-tightening force
surface strain
non-contact measurement
