TEMPERATURE DISTRIBUTION OF GUANGZHOU NEW TV TOWER BASED ON STRUCTURAL HEALTH MONITORING DATA

摘要

For high-rise structures, temperature is one of the most significant factors to affect the structural responses. Field monitoring exercise of 600 m tall Guangzhou New TV Tower (GZNTVT) has shown that the diurnal movement at the top of the main structure due to variation of temperature could be larger than 10 cm in magnitude, which is even larger than the typhoon-induced displacement. Therefore, monitoring and understanding the temperature effects on the super-tall structure is of practical importance. A long-term structural health monitoring (SHM) system consisting of over 700 sensors of sixteen types has been implemented on the GZNTVT for real-time monitoring of the structure at both construction and service stages. As part of this sophisticated SHM system, 48 and 96 temperature sensors have been deployed at 12 cross-sections of the inner and outer tubes, respectively. In this paper, after examining the pre-classified temperature measurement data obtained under sunny days and nonsunny days, common characteristic of the daily temperature variation of the reinforced concrete inner tube is observed for the data acquired in sunny days. Making use of temperature measurement data obtained in 2010, the temperature distribution and variation properties of the inner tube were obtained. By assuming the thermal variation along the vertical direction is constant, the finite element model of a typical concrete wall of the inner tube is constructed to analyse the temperature distribution through the transient heat transfer analysis. The simulated results are further compared with the filed monitoring data.