Abstract
A comparative field measurement for column shortening of tall buildings is presented in this study, with a focus on the reliability and stability of a wireless sensor network. A wireless sensor network was used for monitoring the column shortenings of a 58-story building under construction. The wireless sensor network, which was composed of sensor and master nodes, employed the ultra-high-frequency band and CDMA communication methods. To evaluate the reliability and stability of the wireless sensor network system, the column shortenings were also measured using a conventional wired monitoring system. Two vibration wire gauges were installed in each of the selected 7 columns and 3 walls. Measurements for selected columns and walls were collected for 270 days after casting of the concrete. The results measured by the wireless sensor network were compared with the results of the conventional method. The strains and column shortenings measured using both methods showed good agreement for all members. It was verified that the column shortenings of tall buildings could be monitored using the wireless sensor network system with its reliability and stability.
Highlights
In concrete structures, vertical members, such as columns and shear walls, are continuously shortened even during construction due to vertical loads, material properties, geometry, and construction sequences [1]
The effects of differential shortening are pronounced in tall buildings with a central core and perimeter columns
Similar trends in the developing strains were observed at the wireless sensor network (WSN) and conventional wired sensor network (CWSN)
Summary
Vertical members, such as columns and shear walls, are continuously shortened even during construction due to vertical loads, material properties, geometry, and construction sequences [1]. Field monitoring of column shortening is important in addition to the predictive procedure in the construction of tall buildings. Various sensors, such as electronic gauges, FBG sensors, and vibration wire gauges (VWGs), are available for strain measurement of structural members in tall buildings. Cables are damaged by subsequent construction works This damage degrades the stability of the field measurement and continuous management is required after the installation of sensors. To evaluate the reliability and stability of the wireless sensor network system, column shortening was measured using the conventional wired monitoring system. Based on the comparative monitoring, the reliability and stability of the wireless sensor network system are validated by comparing the measured results with those of the wired monitoring system
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