• CN:11-2187/TH
  • ISSN:0577-6686

›› 2006, Vol. 42 ›› Issue (2): 216-220.

• 论文 • 上一篇    下一篇

钢结构工程中高强度螺栓轴向应力的超声测量技术

张俊;顾临怡;钱筱林;倪守忠;侯兆欣   

  1. 浙江大学流体传动及控制国家重点实验室;浙江省质量技术监督局;中冶集团建筑研究总院
  • 发布日期:2006-02-15

ULTRASONIC MEASUREMENT OF HIGH STRENGTH BOLT AXIAL TENSION IN STEEL CONSTRUCTION

ZHANG Jun;GU Linyi;QIAN Xiaolin NI Shouzhong;HOU Zhaoxin   

  1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University Zhejiang Bureau of Quality and Technical Supervision Central Research Institute of Building and Construction
  • Published:2006-02-15

摘要: 为确保钢结构工程的可靠性和安全性,必须严格控制连接螺栓的预紧力,必要时还要在线监测螺栓工作应力。依据声弹性原理,提出了利用高强度螺栓轴向应力与拧紧前后超声波渡越时间差的关系,结合螺栓材料系数、夹紧厚度等参数,间接检测螺栓轴向应力的方法。克服了耦合层厚度的离散以及温度变化造成的测量误差,大幅度提高了应力的测量精度。在此基础上,提出了材料系数预测、校正的方法。精度分析结果表明,螺栓应力测量精度优于5%,可满足绝大多数工业现场的要求。

关键词: 超声波, 高强度螺栓, 轴向应力检测

Abstract: To guarantee the reliability and security of the steel construction, the clamp load of the joint bolt should be under strict control, sometimes even the tension of the bolt should be measured on-line. Referring to the sonic elasticity principles, an indirect method is proposed for bolt tension measurement, based on the relation between the axial tension of high strength bolt and the time difference for the echo to return from the opposite end before and after the bolt is tightened. This method also takes the material factors and the clamp length into account. The method achieves high accuracy measurement by removing the measuring error caused by the discreteness of the thickness of the couplant and change in temperature. Based on the method, a new way on forecasting and revising the material factors is brought forward. The accuracy in bolt tension measurement is proved to be better than five percent, and thus is acceptable in most of the industry use.

Key words: Axial tension measurement, High strength bolt, Ultrasonic

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