Static and Dynamic Deformation Monitoring of Super High-Rise Buildings During the Construction Stage

Abstract

: To address the insufficient research on the measurement of static and dynamic deformations of super high-rise buildings during the construction stage, a structural health monitoring (SHM) system was installed on the main structure of a practical super high-rise building with a height of 335 m. Thus the temperature deformation, vertical deformation, and dynamic displacement of the main structure during the construction stage were measured and analyzed. The uneven distribution of temperature in the main structure during the construction stage was identified, and the strain characteristics of the structure under the influence of temperature were analyzed. The results showed that the strain caused by seasonal temperature difference was greater than the strain caused by the self-weight of the upper structure and the concrete shrinkage and creep over the same period. The developments of the vertical deformation and the inter-story uneven deformation during the construction stage were explained. The degree of uneven deformation increased with structural height and time. The maximum deformation difference among the points of the same floor was 5.3 mm. The axial stress of the girder was positive correlated with the difference in vertical strain between the two ends of the girder. The difference in vertical deformation between the outer frame and the core tube could lead to tensile cracking in the girder. A structural dynamic displacement estimation method based on Kalman filtering was proposed, which could improve could the accuracy of dynamic displacement estimation by fusing acceleration data and strain data, and could accurately estimate the dynamic displacement of super high-rise building under dynamic construction loads.