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.
High-rise buildings subjected to lateral loads such as wind and earthquake loadsmust be checked not to exceed the limits on the maximum lateral displacement or themaximum inter-story drift ratios. In this paper, a sensing model for deformed shapes of abuilding structure in motion is presented. The deformed shape sensing model based on a2D scanner consists of five modules: (1) module for acquiring coordinate information of apoint in a building; (2) module for coordinate transformation and data arrangement forgeneration of time history of the point; (3) module for smoothing by adjacent averagingtechnique; (4) module for generation of the displacement history for each story anddeformed shape of a building, and (5) module for evaluation of the serviceability of abuilding. The feasibility of the sensing model based on a 2D laser scanner is tested throughfree vibration tests of a three-story steel frame structure with a relatively high slendernessratio of 5.0. Free vibration responses measured from both laser displacement sensors and a2D laser scanner are compared. In the experimentation, the deformed shapes were obtainedfrom three different methods: the model based on the 2D laser scanner, the directmeasurement based on laser displacement sensors, and the numerical method usingacceleration data and the displacements from GPS. As a result, it is confirmed that thedeformed shape measurement model based on a 2D laser scanner can be a promisingalternative for high-rise buildings where installation of laser displacement sensorsis impossible.
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