地震动作用下三层框架模型倒塌的平行双目视觉监测

Parallel stereovision monitoring for collapse of a three-floor frame model under earthquake excitation

在实验室或实际工程中,当传统接触式传感器随着结构或模型的失效破坏而损坏时,会导致结构大变形全程动态测量的失败。为解决此问题,基于平行双目立体视觉模型,结合数字图像相关方法及大范围有效匹配算法(ELAS)实现结构三维变形全程动态测量;基于上述原理,选用MATLAB平台编译立体视觉三维变形测量软件,并使用集成的立体视觉测量系统完成不同加速度峰值El Centro地震动作用下三层框架模型的振动台试验。试验结果表明,在小变形阶段,该方法测得的位移时程曲线与位移计数据吻合较好,充分证明该方法的有效性;在结构倒塌阶段,位移计移走,该方法独立测得三层框架模型倒塌的全程位移曲线,验证该方法用于结构倒塌全程监测的可行性。

In laboratory or actual engineering applications,traditional contact sensors are usually destroyed along with structure damage. To deal with this problem,on the parallel stereovision model,the efficient large-scale stereo matching algorithm（ ELAS） was combined with the DIC method to measure structural vibration response. MATLAB was chosen to compile the stereovision 3 D deformation measurement software based on the proposed algorithm,and a threestory frame model subjected to El Centro earthquake wave at different peak acceleration was measured by the stereovision system in this work. Experiment results show the proposed method has a good agreement with LVDT in time history curves during the stage of small deformations,and this testifies the effectiveness of the proposed method. LVDT sensors were taken away during the collapse stage,the collapse curves of a three-floor frame model were obtained only by the proposed method,and this indicates the capability of the proposed stereovision approach monitoring collapse of structure.