Friction Pendulum Bearings for Seismic Isolation

Abstract

Seismic isolated building structures are examined in this study. Herein, a two dimensional and eight stories of a building with and without triple friction pendulum (TCFP) bearing is used in the time history analysis under three ground motions in order to investigate of the effectiveness of the seismic isolation systems on the building. The motions are the GBZ000 component of the 17 August 1999 Kocaeli Earthquake recorded at Gebze station, the TCU129-W component of the 1999 Chi-Chi earthquake recorded at TCU129 station and the ELC-270 component of the 1940 Imperial Valley earthquake recorded at 117 El-Centro Array #9 station available from PEER database are used as earthquake records in the time history analysis. Results are compared with each other to emphasize efficiency of the TCFP as a seismic isolation device. Additionally, the seismic behavior of structure isolated by TCFP bearing is compared with the response of the same building using the single concave friction pendulum (SCFP) and double concave friction pendulum (DCFP). Results are compared with each other to emphasize efficiency of the TCFP bearing. The results support the advantages of TCFP bearing isolation system.TCFP bearing is used as a seismic isolation system which is easy to be manufactured and enduring more than the others. This system offers advantage to buildings which subject to severe earthquake. This is result of damping force of earthquake by means of their internal constructions, which consists of multiple surfaces. As the combinations of surfaces upon which sliding is occurring change, the stiffness and effective friction change accordingly. The TCFP bearing used in this study is not available current structural analysis program because of newly develop system. Therefore, the TCFP bearings are modeled as of a series arrangement of the three SCFP bearings. This arrangement is call series model. TCFP bearing is not exactly like a model organized as a three SCFP bearing in series model although it is similar. Therefore, rigid beam and gap elements are also used.Seismic isolated building structures are examined in this study. Herein, a two dimensional and eight stories of a building with and without triple friction pendulum (TCFP) bearing is used in the time history analysis under three ground motions in order to investigate of the effectiveness of the seismic isolation systems on the building. The motions are the GBZ000 component of the 17 August 1999 Kocaeli Earthquake recorded at Gebze station, the TCU129-W component of the 1999 Chi-Chi earthquake recorded at TCU129 station and the ELC-270 component of the 1940 Imperial Valley earthquake recorded at 117 El-Centro Array #9 station available from PEER database are used as earthquake records in the time history analysis. Results are compared with each other to emphasize efficiency of the TCFP as a seismic isolation device. Additionally, the seismic behavior of structure isolated by TCFP bearing is compared with the response of the same building using the single concave friction pendulum (SCFP) and double concave friction pendulum (DCFP). Results are compared with each other to emphasize efficiency of the TCFP bearing. The results support the advantages of TCFP bearing isolation system.TCFP bearing is used as a seismic isolation system which is easy to be manufactured and enduring more than the others. This system offers advantage to buildings which subject to severe earthquake. This is result of damping force of earthquake by means of their internal constructions, which consists of multiple surfaces. As the combinations of surfaces upon which sliding is occurring change, the stiffness and effective friction change accordingly. The TCFP bearing used in this study is not available current structural analysis program because of newly develop system. Therefore, the TCFP bearings are modeled as of a series arrangement of the three SCFP bearings. This arrangement is call series model. TCFP bearing is not exactly like a model organized as a three SCFP bearing in series model although it is similar. Therefore, rigid beam and gap elements are also used.