基于三维激光扫描的罩棚结构安全评估技术研究

Research on Safety Assessment Technology of Canopy Structure Based on 3D Laser Scanning

采用索膜结构的罩棚是建筑结构中常见的柔性结构体系,但因其具有几何非线性特性,因此对其进行结构安全评估一直是行业中的一个难题。索膜结构的线形变化会改变结构的受力分布,乃至影响整体结构的安全工作性能。因此,可利用三维激光扫描技术对索膜结构的罩棚进行扫描,利用激光点云数据对结构线形进行测量,再根据实测线形数据对索膜结构进行逆向建模,最后通过有限元模型的分析,便可对罩棚结构进行安全评估。该逆向建模分析的方法对于复杂结构的安全评估能提供有益的参考。

The canopy with cable membrane structure is a common system of building structure. Because of the geometric nonlinear characteristics, it’s difficult to evaluate the structural safety in the industry. The linear change of cable membrane structure will change the stress distribution of the structure, and even affect the safe performance of the whole structure. Therefore, the 3D laser scanning technology can be used to scan the canopy of cable membrane structure, the laser point cloud data to measure the structure alignment. The cable membrane structure can be inversely modeled according to the measured alignment data. Finally, the safety of the canopy structure can be evaluated by finite element model analysis. The reverse modeling analysis method can provide a useful reference for the safety assessment of complex structures.