Real-time Long-term monitoring and static and dynamic displacements of an office tower, combining RTK GPS and accelerometer data

Session 1 - Surveying in Construction. James Brownjohn, Chris Rizos, Guan-Hong Tan and Tso-Chien Pan. TS1.4 Real-Time Long-Term Monitoring of Static and Dynamic Displacements of an Office Tower, Combining RTK GPS and Accelerometer Data. Published in: 1st FIG International Symposium on Engineering Surveys for Construction Works and Structural Engineering Nottingham, United Kingdom, 28 June – 1 July 2004Available from the Conference website at: https://www.fig.net/resources/proceedings/2004/nottingham/proc/ts_01_4_brownjohn_etal.pdfFull conferences available from FIG at: https://www.fig.net/resources/proceedings/index.asphttps://www.fig.net/resources/proceedings/index.aspSince 1993 a 280m building in Singapore has been instrumented using an evolving monitoring system that began with manual static readings of stress and strain and progressed through a full-scale vibration survey to a permanent remote control system using basement and roof accelerometers together with anemometers to capture the effect of wind and seismic loads. Recently a dual-rover RTK GPS system has been operating in synchronisation with the wind and acceleration system in order to test the feasibility of GPS for building performance monitoring and to understand the way the building responds quasi-statically to wind, temperature and seismic loads. The paper describes the system integration for the present monitoring system and presents some results on performance of the building and the GPS syste