Influence of experimental data and FE model on updating results of a brick chimney
The present study deals with dynamic identification and model updating of the Howa brick chimney to preserve brick chimneys. From the results of dynamic tests, the fundamental frequencies of the Howa brick chimney are estimated to be about 3.06Hz and 2.69Hz in northsouth and eastwest directions, respectively. The natural modes and damping factors are identified by ARMAV (auto-regressive moving average vectors) model. The numerical model updating based on IEM (inverse eigensensitivity method) is applied to two models with two updating procedures; using only frequencies and both frequencies and mode shapes. The updating results show the mode shapes are very important to obtain the good results for the numerical model updating. From the results of the numerical model updating, the damaged areas are identified; these are found to correspond well to the position of the cracks of the static collapse test.
brick chimney dynamic identification model updating dynamic test armav iem