4th National Conference on Earthquake Engineering & Technical Seismology
4th National Conference on Earthquake Engineering & Technical Seismology (Athens, 5-7 Sept. 2019)
EA Group in cooperation with GERB, presented a Paper with the subject “Tuned Mass Control Systems for Seismic Retrofit of Important Buildings” at the 4th National Conference on Earthquake Engineering & Technical Seismology.
This offering described the seismic retrofitting strategy for a hospital in Slobozia, Romania. Details of realized projects were presented following a brief introduction in the basic principles using a Tuned Mass Control System (TMCS) for the seismic control of structures. Results of numerical and experimental research were outlined to verify the effectiveness of the mitigation measures.
A TMCS consists of an additional mass, typically arranged at the highest point of a structure. Helical steel springs can be used to connect the mass elastically with the main structure. The stiffness properties of the spring devices are chosen to tune the corresponding frequencies of the TMCS in regard to the authoritative frequency range of the structure. Viscous dampers are mounted 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 yields a reduction of the induced acceleration and displacement levels as well as the internal stresses, support reactions and interstorey drift due to earthquakes. Another major advantage is the possibility to operate inside the building as there is no disturbance during the upgrade activities.
Authors: P. Nawrotzki, D. Siepe
EA Group in cooperation with GERB, presented a Paper with the subject “Tuned Mass Control Systems for Seismic Retrofit of Important Buildings” at the 4th National Conference on Earthquake Engineering & Technical Seismology.
This offering described the seismic retrofitting strategy for a hospital in Slobozia, Romania. Details of realized projects were presented following a brief introduction in the basic principles using a Tuned Mass Control System (TMCS) for the seismic control of structures. Results of numerical and experimental research were outlined to verify the effectiveness of the mitigation measures.
A TMCS consists of an additional mass, typically arranged at the highest point of a structure. Helical steel springs can be used to connect the mass elastically with the main structure. The stiffness properties of the spring devices are chosen to tune the corresponding frequencies of the TMCS in regard to the authoritative frequency range of the structure. Viscous dampers are mounted 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 yields a reduction of the induced acceleration and displacement levels as well as the internal stresses, support reactions and interstorey drift due to earthquakes. Another major advantage is the possibility to operate inside the building as there is no disturbance during the upgrade activities.
Authors: P. Nawrotzki, D. Siepe
