3D identification of seismically excited buildings with sensors arbitrarily placed

An algorithm for identifying the parameters of buildings under bidimensional (orthogonal) seismic excita- tion, using measurements of sensors arbitrarily arranged on the stories is presented. The model considers three degrees of freedom (DOF) for each story and uses a convenient re- parameterization of the least-squares algorithm that allows an important reduction in the order of the covariance matrix, when compared with the standard formulation. Results of simulation for a 3-story building confirm the efficacy of the proposed method. Index Terms— building control parametric identification least-squares identification In this article, the work presented in (10) is extended. It is now assumed that sensors are arbitrarily arranged in the stories and not in the center of mass, as it was the case in (10). This is the scenario that can be expected in instrumented buildings. The goal of this paper is to investigate the role of sensor placing in the identification algorithm and in the computation of the center of torsion. The rest of the paper contains several sections that deal with the building's mathematical model, the han- dling of measurements and the least-squares algorithm. Simulation results and concluding remarks are also included.