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In this paper, two different time-domain methods are proposed. Both have been successful in the identification of the natural frequencies, damping ratios and mode shapes of large structures seismically tested by using the pseudodynamic method. The first method is formulated as a spatial model in which the stiffness and damping matrices are directly identified from the experimental displacements, velocities and restoring forces.The obtained matrices are then combined with the theoretical mass in order to obtain the eigenfrequencies and modes. The second method is formulated as a filter model of specified order in which the ground accelerogram acts as input and the experimental displacements act as output. In this case the eigenfrequencies and modes are obtained from the identified coefficients of the filter. This paper also compares the results of such identification methods applied to a 3-storey steel concrete composite building and a 2-storey seismically retrofitted reinforced concrete building.

Additional information

Authors: MOLINA F J, ISIS, Ispra (IT);PEGON D, ISIS, Ispra (IT);VERZELETTI G, ISIS, Ispra (IT)
Bibliographic Reference: Paper presented: 2nd International Conference on Identification of engineering structures, Swansea (GB), March 29-31st, 1999
Availability: Available from DG XIII as Paper EN 42052 ORA
Record Number: 199910309 / Last updated on: 1999-03-12
Original language: en
Available languages: en