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논문 기본 정보

자료유형
학술저널
저자정보
Xu, Xiaomin (Department of Engineering, University of Cambridge) Soga, Kenichi (Department of Engineering, University of Cambridge) Nawaz, Sarfraz (Department of Engineering, University of Cambridge) Moss, Neil (Transport for London) Bowers, Keith (Transport for London) Gajia, Mohammed (Transport for London)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제15권 제3호
발행연도
2015.1
수록면
769 - 785 (17page)

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Although timber structures have been extensively used in underground temporary supporting system, their actual performance is poorly understood, resulting in potentially conservative and over-engineered design. In this paper, a novel wireless sensor technology, SmartPlank, is introduced to monitor the field performance of timber structures during underground construction. It consists of a wooden beam equipped with a streamlined wireless sensor node, two thin foil strain gauges and two temperature sensors, which enables to measure the strain and temperature at two sides of the beam, and to transmit this information in real-time over an IPv6 (6LowPan) multi-hop wireless mesh network and Internet. Four SmartPlanks were deployed at the London Underground's Tottenham Court Road (TCR) station redevelopment site during the Stair 14 excavation, together with seven relay nodes and a gateway. The monitoring started from August 2013, and will last for one and a half years until the Central Line possession in 2015. This paper reports both the short-term and long-term performances of the monitored timber structures. The grouting effect on the short-term performance of timber structures is highlighted; the grout injection process creates a large downward pressure on the top surface of the SmartPlank. The short and long term earth pressures applied to the monitored structures are estimated from the measured strains, and the estimated values are compared to the design loads.

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