Retrofitting of a Hospital Using a Tuned Mass Control System

Abstract eng:
The contribution deals with the description of the seismic retrofit strategy for a hospital in Slobozia, Romania. After a brief introduction in the basic principles using a Tuned Mass Control System (TMCS) for the seismic control of structures, details of the executed project are presented. Results of numerical and experimental investigations are described to verify the effectiveness of the mitigation measures. A TMCS consists of an additional mass, usually arranged at the highest location of a structure. Helical steel springs can be used to connect the mass elastically with the structure. The stiffness properties of the spring elements are chosen to tune the corresponding frequencies of the TMCS in regard to the authoritative frequency range of the main structure. Viscous dampers are installed in parallel to the spring devices to widen the operating frequency band of the TMCS and to reduce the relative motion between the two structures. The protection system is able to reduce the induced acceleration and displacement levels as well as the internal stresses, support reactions and interstorey drift due to seismic loadings. Another important advantage is the possibility to operate inside the building as there is no disturbance by the upgrade activities.

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