摘要
钢绞线作为预应力结构的关键受力构件,为实现对其应力信息的准确测量,提出一种基于逆磁致伸缩的无励磁钢绞线现存应力测量方法。首先,通过建立磁电力耦合理论模型,探析外加荷载、铁磁材料的磁导率与线圈系统自感系数之间的内在联系。其次,基于COMSOL有限元软件,量化模拟了钢绞线应力变化时自感线圈系统的电感变化。最后,搭建试验测量平台展开试验验证。结果表明,基于该测量方法获取的电感值具有较高的可重复性,在激励电流不变情况下,15组试验数据的电感与荷载之间均显著呈一定函数关系,拟合优度R^2均大于0.99,且检测灵敏度随自感线圈有效磁路长度增加而增加,拟合值与实测值之间误差微小,满足工程需要,进一步验证了该方法的合理性。
In order to achieve accurate measurement of stress information, a new method of existing stress measurement based on inverse magnetostriction for non-excited steel strand, which is the key loaded component of the prestressed structure, is proposed. Firstly, through establishing the theoretical model of magnetoelectric coupling, the internal relationship of the external load and the permeability of ferromagnetic materials versus the self-inductance coefficient of the coil system is analyzed. Secondly, based on the COMSOL finite element software, the inductance variation of the self-inductance coil system is simulated quantitatively when the stress of the steel strand changes. Finally, the test and measurement platform was built to carry out the test and verification. The results show that the inductance value obtained based on the proposed measurement method has high repeatability;under the condition that the excitation current is constant, the relationships of the inductance versus load for 15 groups of test data all exhibit a significant functional relationship and the goodness of fit R^2 is greater than 0.99. The detection sensitivity increases with the increasing of the effective magnetic circuit length of the self-inductance coil. The error between the fitting value and the measured value is quite small, which meets the engineering requirement and further verifies the rationality of the proposed method.
作者
陈静雯
张洪
张森华
廖棱
周建庭
Chen Jingwen;Zhang Hong;Zhang Senhua;Liao Leng;Zhou Jianting(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2019年第10期10-18,共9页
Chinese Journal of Scientific Instrument
基金
国家重点研发计划(2017YFC0806007)
国家杰出青年科学基金(51425801)
国家自然科学基金(51808081)
特大跨轨道连续刚构桥建设关键技术与应用(cstc2018jscx-mszdX0084)
重庆交通大学研究生教育创新基金项目(2019S0154,2019S0156)项目资助
关键词
逆磁致伸缩效应
现存应力
自感
电感
inverse magnetostrictive effect
existing stress
self-inductance
inductance
