DOI: 10.15986-j.1006-7930.2019.06.001
通过对Q235门式刚架进行拟静力试验,检测其中钢柱表面的法向漏磁场,得到了不同荷载作用下磁记忆信号的法向分量,研究了磁信号在不同受力阶段的变化特征,建立了磁信号及其梯度值与应力集中部位的对应关系.试验结果表明:随着荷载的增加,磁信号法向分量先增加后减小,转折处可以较好的判断构件是否进入屈服阶段; Hp(y)值出现极值和反转现象,可以较好的判断应力集中部位; 用梯度值出现极值判断应力集中位置,会出现偏差很小的延后现象,可以用来辅助判断应力集中.
Through the pseudo static test on gabled framed of Q235 low carbon steel, the normal leakage magnetic field on the surface of the steel column is detected, the normal component of metal magnetic memory signals under different loads are obtained, the variation characteristics of metal magnetic signals at different stress stages are studied, and the corresponding relationship between metal magnetic signals and their gradient value and stress concentration position is established. The test results show that the normal component of magnetic signal increases first and then decreases with the increase of loading, which can better determine whether the components enter the yield stage. The value of Hp(y)presents extreme value and reverse phenomenon, which can be used to judge the stress concentration position well; When the extreme value of gradient value is used to judge the stress concentration position, there will be a delay phenomenon with small deviation, which can be used to assist the judgment of stress concentration.
