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A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner
Department of Architectural Engineering, Yonsei University, Seoul 120-749, Korea
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Received: 18 March 2013; in revised form: 24 April 2013 / Accepted: 14 May 2013 / Published: 21 May 2013
Abstract: 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.
Keywords: displacement sensing; deformed shape; 2D laser scanner; structural health monitoring
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MDPI and ACS Style
Choi, S.W.; Kim, B.R.; Lee, H.M.; Kim, Y.; Park, H.S. A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner. Sensors 2013, 13, 6746-6758.
Choi SW, Kim BR, Lee HM, Kim Y, Park HS. A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner. Sensors. 2013; 13(5):6746-6758.
Choi, Se W.; Kim, Bub R.; Lee, Hong M.; Kim, Yousok; Park, Hyo S. 2013. "A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner." Sensors 13, no. 5: 6746-6758.