Abstract
The dynamic characteristics of structures are evaluated rather frequently by measuring their vibrations. This is done to investigate wind vibrations of high-rise buildings or for other purposes. However, few vibration evaluations have focused on changes in the structural properties of buildings or on the rigidity of main structures and non-structural walls during construction. This paper describes changes of the dynamic characteristics of a 15-story office building in four construction stages from the foundation stage to completion. The structural properties of each construction stage were modeled as accurately as possible by FEM, and evaluation of the stiffness of main structural frame and comparing these FEM results with measurement results performed non-load-bearing elements. Full-scale measurements were also carried out on high-rise chimney, and good correspondence was shown with vibration characteristics obtained by the 2DOF-RD technique and the Frequency domain Decomposition method.
