Application of Multi-camera Digital Image Correlation in the Stability Study of the Long Timber Column with the Circular Cross-section under Axial Compression
Application of Multi-camera Digital Image Correlation in the Stability Study of the Long Timber Column with the Circular Cross-section under Axial Compression
复制标题
多相机数字图像相关在圆截面长木柱轴压稳定性研究中的应用
DOI：
10.15376/biores.17.1.1717-1728
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发表时间：
2022-02-01
期刊：
影响因子：
1.5
通讯作者：
He, Xiaoyuan
中科院分区：
文献类型：
--
作者：
Li, Hongmin;Dai, Yuntong;He, Xiaoyuan
位移计综合法作为一种传统的方法，被广泛用于捕捉试件的局部变形。然而，对于轴对称的圆柱体，由于弯曲方向的不确定性，DMS方法不能准确地评价其轴压稳定性。为了解决这一问题，提出了一种由8个摄像头组成的360度全表面数字图像相关(DIC)系统，以获取轴压下柱表面的全场变形信息。本研究的目的是通过实验验证所提出的新测量方法在跟踪圆形截面长木柱满填压缩变形方面的有效性。试验结果表明，柱子发生了失稳破坏。多摄像头DIC系统可以完整地重建圆柱体的三维形状，获得木柱体表面任意位置的全过程变形状态。DIC方法还可以捕捉到不确定的侧向变形方向，并可获得木柱跨中侧移的数据。多摄像头DIC为轴对称长木柱的稳定性测试分析提供了一种直观、全面的新方法。
Displacement meter synthesis (DMS), as a traditional method, is widely used to capture the local deformation of a specimen. However, for axissymmetrical circular columns, the axial compression instability cannot be accurately evaluated using the DMS method due to the uncertain bending direction. To address this problem, a 360 degrees full-surface digital image correlation (DIC) system composed of eight cameras is proposed to capture the full-field deformation information of the column surfaces under axial compression. The objective of this study was to experimentally validate the efficiency of the proposed novel measurement in tracking the full-filled compressive deformation of a long wooden column with the circular cross-section. The test results showed that the columns experience instable failure. The multi-camera DIC system can completely reconstruct the three-dimensional shape of the circular column and obtain the whole process deformation state at any position on the surface of the timber column. The DIC method also can capture the uncertain lateral deformation direction and obtain the data of lateral deflection at the midspan of timber columns. The multi-camera DIC provides an intuitive and comprehensive new test method for the test and analysis of the stability of axisymmetric long timber columns.