T. AOKI (1) and D. SABIA (2)

(1) Graduate School of Design and Architecture, Nagoya City University, Japan

(2) Department of Structural and Geotechnical Engineering, Politecnico di Torino, Italy


Dynamic and static analyses of existing structures are very important to obtain reliable information related to actual structural properties. For this purpose a series of material tests and dynamic and static collapse tests of the existing brick chimneys in Tokoname are carried out. From the material tests, the compressive strength and Young’s modulus of the brick used for these chimneys are estimated to be 7.5N/mm2 and 3.2kN/mm2, respectively. From the results of the dynamic tests, the fundamental frequencies of the Howa brick chimney are estimated to be around 3.06Hz and 2.69Hz in the north-south and east-west directions respectively. Its natural modes and damping factors are identified by ARMAV (Autoregressive Moving Average Vectors) and ERA (Eigensystem Realization Algorithm) models. From the results of the numerical model updating based on IEM (Inverse Eigensensitivity Method), the damaged areas are identified; these are found to correspond well to the position of the cracks of the static collapse test.