直接线形变换法在钢结构震动监测中的应用研究

利用数字摄影方法进行钢结构震动变形的监测，可以解决常规测量方法无法解决的难题，然而数字摄影所采用的数码相机属于非测量相机，没有框标及定向设备，不能得到摄影瞬间的内、外方位元素的初始值。因此用数码相机获取的测量数据传统解法无法计算处理。为提高测量精度，我们对数码相机进行检校，将检校的相机在钢结构变形监测实验中使用，实际测量数据利用直接线性变换法处理。该方法有效地减弱数码相机内、外方位元素不稳定以及外界环境条件的影响，取得了成果分析精度达3‰的效果。

The application study of the direct linear transform method in deformation observation

Digital camera belongs to non-metric camera with no fiducially marks and orientation equipment. Thus it is impossible to obtain the approximate values of the interior and exterior orientation elements at the moment of shoot. So the measurements obtained by digital camera cannot be processed by conventional methods. Using the verified digital camera to monitor the steel structure in deformation experiments and process measurements is effective to weak the influence of the instability of the interior and exterior orientation elements of digital camera as well as the conditions of environment. By doing so, the precision of the final results obtained is 3‰.