Post-earthquake building safety evaluation using consumer-grade surveillance cameras
Post-earthquake building safety evaluation using consumer-grade surveillance cameras
复制标题
使用消费级监控摄像头进行震后建筑安全评估
DOI：
10.12989/sss.2020.25.5.531
复制
发表时间：
2020
影响因子：
3.5
通讯作者：
Yuan
中科院分区：
文献类型：
--
作者：
T. Hsu;Quang;Wei;Yuan
本文论证了利用安装在建筑物内的消费级监控摄像头在地震发生后立即评估建筑物安全性的可能性。基于摄像机定标、立体三角测量和图像模板匹配技术，在每层中使用两个摄像机来提取地震期间的层间位移时程。利用刚性楼板上多个标志点的层间漂移，利用最小二乘法估计几何中心的运动，从而估计出楼板上任意位置的水平层间漂移。通过对某钢结构建筑的振动台倒塌试验，验证了该方法的有效性。结果表明，摄像机测量的层间位移具有较高的精度，可以根据层间位移比的易损性曲线来判断建筑物的损伤状态。另一方面，由于采用高通滤波进行基线校正时，位移信号中的低频成分被剔除，因此当残余层间漂移发生时，加速度计所测得的层间漂移往往会低估损伤状态。
This paper demonstrates the possibility of evaluating the safety of a building right after an earthquake using consumergrade surveillance cameras installed in the building. Two cameras are used in each story to extract the time history of interstory drift during the earthquake based on camera calibration, stereo triangulation, and image template matching techniques. The interstory drift of several markers on the rigid floor are used to estimate the motion of the geometric center using the least square approach, then the horizontal interstory drift of any location on the floor can be estimated. A shaking table collapse test of a steel building was conducted to verify the proposed approach. The results indicate that the accuracy of the interstory drift measured by the cameras is high enough to estimate the damage state of the building based on the fragility curve of the interstory drift ratio. On the other hand, the interstory drift measured by an accelerometer tends to underestimate the damage state when residual interstory drift occurs because the low frequency content of the displacement signal is eliminated when high-pass filtering is employed for baseline correction.