A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner

Sensors

Se Woon Choi¹  Bub Ryur Kim¹  Hong Min Lee¹  Yousok Kim¹ 

[1] Department of Architectural Engineering, Yonsei University, Seoul 120-749, Korea;

关键词: displacement sensing;    deformed shape;    2D laser scanner;    structural health monitoring;   

DOI  :  10.3390/s130506746

来源: mdpi

【 摘 要 】

High-rise buildings subjected to lateral loads such as wind and earthquake loads must be checked not to exceed the limits on the maximum lateral displacement or the maximum inter-story drift ratios. In this paper, a sensing model for deformed shapes of a building structure in motion is presented. The deformed shape sensing model based on a 2D scanner consists of five modules: (1) module for acquiring coordinate information of a point in a building; (2) module for coordinate transformation and data arrangement for generation of time history of the point; (3) module for smoothing by adjacent averaging technique; (4) module for generation of the displacement history for each story and deformed shape of a building, and (5) module for evaluation of the serviceability of a building. The feasibility of the sensing model based on a 2D laser scanner is tested through free vibration tests of a three-story steel frame structure with a relatively high slenderness ratio of 5.0. Free vibration responses measured from both laser displacement sensors and a 2D laser scanner are compared. In the experimentation, the deformed shapes were obtained from three different methods: the model based on the 2D laser scanner, the direct measurement based on laser displacement sensors, and the numerical method using acceleration data and the displacements from GPS. As a result, it is confirmed that the deformed shape measurement model based on a 2D laser scanner can be a promising alternative for high-rise buildings where installation of laser displacement sensors is impossible.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.