摘要
针对钢管桁架拱结构焊缝裂纹损伤问题,提出基于压电波动法的焊缝裂纹损伤主动监测方法。以应用于隧道支护的方钢管桁架三角拱作为实验试件,在预定位置安装6个压电陶瓷传感器,采集各级荷载作用下传感器对于不同损伤程度裂纹的响应信号,并且比较分析其时域信号幅值、频域信号幅值及小波包能量幅值的变化。试验结果表明:随着焊缝裂纹的增多和加深,压电陶瓷传感器时域信号幅值、频域信号幅值及小波包能量幅值呈现出递减趋势;随着外界荷载的增加,压电陶瓷传感器时域信号幅值、频域信号幅值及小波包能量幅值呈现出递增趋势;采用的损伤指标能准确衡量焊缝裂纹的损伤状况。该研究成果验证了压电波动法对于钢管桁架拱结构焊缝裂纹损伤监测的有效性和准确性。
Aiming at the problem of weld crack damage in steel tube truss arch structures, an active monitoring method of weld crack damage based on piezoelectric wave is proposed. The square steel-pipe truss triangular arch was taken as the experimental specimen. Six piezoelectric sensors were installed in the predetermined positions and four of them were used to collect the response signals to different damage degrees under the load. The change of the time-domain signal amplitude, the frequency-domain signal amplitude and the energy amplitude of wavelet packet received by the piezoelectric ceramic sensors were compared and analyzed under damage conditions. The results show that the time-domain signal amplitude, the frequency-domain signal amplitude and the wavelet packet energy amplitude of piezoelectric ceramic sensors show a decreased trend with the increase and deepening of weld cracks. At the same time, the time-domain signal amplitude, the frequency-domain signal amplitude and the wavelet packet energy amplitude show an increasing trend as the load rose up,and the adopted damage index can accurately measure the damage conditions of the weld crack.Therefore, the validity and accuracy of the piezoelectric wave method for monitoring the weld crack in steel tubular truss arch structures were verified.
作者
赵淑兰
金添
肖敏
宁怡豪
ZHAO Shu-lan;JIN Tian;XIAO Min;NING Yi-hao(Foshan Highway & Bridge Construction Co.,Ltd.,Foshan 528313,China;School of Civil Engineering,Hunan University,Changsha 410082,China;School of Civil Engineering,Changsha University of Science & Technology,Changsha 410114,China;Guangxi Transportation Research and Consulting Co.,Ltd.,Nanning 530007,China)
出处
《交通科学与工程》
2019年第2期82-88,共7页
Journal of Transport Science and Engineering
关键词
钢管桁架拱
焊缝裂纹损伤
压电陶瓷
波动法
square steel-pipe truss arch
weld crack damage
piezoelectric ceramic
PZT-based wave method
