结构构件压剪试验摩擦力测量装置开发与应用  

Development and application of friction force measurement device for compression-shear tests

作　　者：刘亮[1] 潘鹏[2,3] 王海深 冯鹏[1,2] 赵蒙怀 LIU Liang;PAN Peng;WANG Haishen;FENG Peng;ZHAO Menghuai(Department of Civil Engineering, Tsinghua University, Beijing 100084, China;Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education, Tsinghua University,Beijing 100084, China;National Engineering Laboratory for Green and Safe Construction Technology in Urban Rail Transit,Tsinghua University, Beijing 100084, China;Beijing Fluid Control System Corp., Beijing 100088 , China)

机构地区：[1]清华大学土木工程系,北京100084 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [3]清华大学城市轨道交通绿色与安全建造技术国家工程实验室,北京100084 [4]北京佛力系统公司,北京100088

出　　处：《建筑结构学报》2019年第6期133-139,共7页Journal of Building Structures

基　　金：“十三五”国家重点研发计划(2016YFC0701901);国家自然科学基金项目(51778342);清华大学互联网产业研究院项目(201702001)

摘　　要：在结构构件压剪试验中,准确获得竖向作动器与反力架间的摩擦力,是得到其准确承载力的关键。针对一种摩擦力测量装置开展研究,该装置可承担20 000kN轴向压力,水平方向可测量不超过500kN范围内的摩擦力。详细介绍了该摩擦力测量装置的工作原理,推导了所测摩擦力和该装置应变的关系;提出了将应变转化为电压信号的全桥电路,推导并证明了所测摩擦力和输出电压信号间成线形关系;通过试验标定了所测力和应变的比例关系,得到摩擦力测量装置的灵敏度系数。将该摩擦力测量装置应用于多种结构构件的压剪试验,结果表明,该摩擦力测量装置能够准确测量竖向作动器与反力架间的摩擦力,有效提高了大型压剪试验的精度。In the compression-shear test of structural members,precise measurement of the friction force between the vertical actuator and the loading frame is important to obtain the accurate strength of the specimen. This paper proposes an innovative friction force measurement device,which can sustain a vertical load of 20 000 kN,and measure friction force no larger than 500 kN. The working principle of the device is presented,and the relationship between the measured force and strain is derived. A full-bridge circuit is developed to transform the strain to the voltage signal,and the linear relationship between the measured force and the voltage signal is proved. The coefficient to describe the relationship between the measured force and the strain is calibrated. The device is validated by a series of compressionshear tests. The test results suggest that the device can accurately measure the friction force between the test specimen and the loading frame,thus can significantly increase the accuracy of large-scale compression-shear tests.

关 键 词：压剪试验 摩擦力测量装置 全桥电路 灵敏度系数 

分 类 号：TU317[建筑科学—结构工程]