Frequency and damping evolution during experimental seismic response of civil engineering structures
The results of the seismic tests on several reinforced-concrete shear walls and a four-storey frame are analyzed in this paper. Each specimen was submitted to the action of a horizontal accelerogram, with successive growing amplitudes, using the pseudodynamic method. AN analysis of the results allows knowing the evolution of the eigen frequency and damping ratio during the earthquakes thanks to an identification method working in the time domain. The 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 eigen frequencies, damping ratios and modes. Those parameters have a great relevance for the design of this type of structure.
Bibliographic Reference: Paper presented: System Identification and Structural Health Monitoring, Madrid (ES), 6-9th June (2000)
Availability: Available from the Public Relations and Publications Unit, Ispra (IT)
Record Number: 200011934 / Last updated on: 2000-05-12
Original language: en
Available languages: en