温度对超声法识别螺杆紧固力影响的足尺试验  

Full scale experiment on the influence of temperature on ultrasonic identification of screw tightening force

作　　者：陈亮 王佳宁 曹资源 周勇军[2] CHEN Liang;WANG Jianing;CAO Ziyuan;ZHOU Yongjun(Guangxi Xingang Communications Investment Corporation Ltd,Qinzhou 535000,Guangxi,China;Research Center of Highway Large Structure Engineering on Safety,Ministry of Education,Chang‘an University,Xi‘an 710064,Shaanxi,China)

机构地区：[1]广西欣港交通投资有限公司,广西钦州530012 [2]长安大学公路大型结构安全教育部工程研究中心,陕西西安710064

出　　处：《声学技术》2025年第1期87-92,共6页Technical Acoustics

基　　金：广西科技重点研发计划(桂科AB23026125)。

摘　　要：为研究温度对超声波法识别螺杆紧固力的影响,以龙门大桥索夹MJ45螺杆为对象开展了螺杆紧固力检测方法的试验研究。首先,制作了室内单个螺杆模型,在环境试验室采用智能张拉设备将螺杆张拉至不同应力状态,调整环境温度,利用超声纵波检测方法研究不同温度下超声回波声时与螺杆紧固力的关系,从而建立了螺杆紧固力超声检测公式。其次,制作了具有8根螺杆的索夹足尺模型,将全部螺杆张拉至设计值,基于超声回波声时和单根螺杆紧固力检测模型,采用内插法得到拟合螺杆紧固力,并与足尺试验螺杆的实际有效紧固力进行对比,最后,通过试验结果对螺杆紧固力超声检测公式进行校正。研究结果表明,温度对超声回波声时的影响较大,但在不同温度下,螺杆应力差相同则回波声时差也相同,即此时的回波声时差不受温度影响,回波声时与拉力的斜率为3.9345×10^(−3)μs·kN^(−1)。在足尺试验中,单根螺杆超声拟合螺杆紧固力与实际的螺杆紧固力最大偏差约16%,提出螺杆紧固力超声检测公式的修正系数为1.12。研究结果可为实际工程的螺杆紧固力检测提供依据。To study the effect of temperature on the ultrasonic detection of screw fastening force,an experimental study of screw fastening force detection method is carried out on the MJ45 screw of the cable clamp of the Longmen Bridge.Firstly,a single screw model is made in the indoor environment laboratory,and the screw is tensioned to different stress states by using intelligent tensioning equipment,and the environment temperature is adjusted.The relationship between ultrasonic echo time and screw fastening force under different temperatures is studied by using ultrasonic longitudinal wave detection method,and the ultrasonic detection formula for screw fastening force is established.Secondly,a cable clamp model with 8 screws is made,and all screws are tensioned to the design value.Based on the ultrasonic echo time value and the single screw fastening force detection model,the fitting values of screw fastening force are obtained by interpolation method,and compared with the actual effective fastening force of the screw.Finally,the ultrasonic detection formula for screw fastening force is corrected based on the experimental results.The results show that temperature has a significant effect on the ultrasonic echo time,but at different temperatures,the difference in screw stress results in the same difference in echo sound time,that is,the echo sound time difference is not affected by temperature and the slope of the relation ship between echo time and screw tension is 3.9345×10^(−3)μs·kN^(−1).In the full-scale test,the maximum deviation between the ultrasonic fitted screw tightening force of a single screw and the actual screw tightening force is about 16%,and the correction coefficient of the ultrasonic testing formula is finally proposed to be 1.12.The research results can provide a basis for the detection of screw tightening force in actual engineering.

关 键 词：索夹螺杆 紧固力 超声纵波 足尺试验 温度 

分 类 号：TB559[理学—物理]