TY - CHAP
T1 - PERFORMANCE OF SEISMICALLY ISOLATED LIQUID STORAGE TANKS USING TRIPLE PENDULUM BEARINGS
AU - Ambrosio, S. J.
AU - Mamani, E. J.
AU - Fernández-Dávila, V. I.
N1 - Publisher Copyright:
© The 17th World Conference on Earthquake Engineering.
PY - 2021
Y1 - 2021
N2 - It presents the seismic response of circular cylindrical Reinforced Concrete (RC) liquid storage tanks which, besides playing a fundamental role in the water supply system, are also useful in the industry for the storage of petroleum, liquefied natural gas and chemical liquids, among others. In highly seismic countries such as Peru, it is very important that these structures remain operational after the occurrence of a severe seismic event. The most representative geometrical and dynamic parameters of the structural system were identified: ratio of water height and radius of the tank (H/R), effective period (Teff), effective viscous damping (ζeff), and the level of seismic hazard considered (e.g. return period TR). Subsequently, a family of 45 cases was generated from the combination of the four mentioned parameters to show the effectiveness of the triple friction pendulum bearings located at the base of the tanks. The regimes of displacement of the isolation system were configured to address specific response criteria for: SLE, Service Level Event (TR = 72 years); DBE, Design Basis Event (TR = 475 years); and MCE, Maximum Considered Event (TR = 2,475 years). Time-history analyses were performed with 14 pairs of seismic records for different coefficients of friction, effective radii of the pendulum and displacement capacities of the isolators to study the effects of the parameters of the superstructure for different levels of seismic hazard. The main responses of interest were: the base shear, the overturning moment of the walls, the vertical displacement of the waves and the lateral displacement of the base of the tank; where a clear difference between the models was observed based on the effective period (3 and 4 seconds). In addition, it was appreciated that the parameter (H/R) was very influential in all the answers due to its direct relationship with the weight of the structure and its rigidity. The results show that the triple friction pendulum bearings have a good adaptability for different levels of seismic hazard and are effective to mitigate the seismic demand in tanks for liquid storage.
AB - It presents the seismic response of circular cylindrical Reinforced Concrete (RC) liquid storage tanks which, besides playing a fundamental role in the water supply system, are also useful in the industry for the storage of petroleum, liquefied natural gas and chemical liquids, among others. In highly seismic countries such as Peru, it is very important that these structures remain operational after the occurrence of a severe seismic event. The most representative geometrical and dynamic parameters of the structural system were identified: ratio of water height and radius of the tank (H/R), effective period (Teff), effective viscous damping (ζeff), and the level of seismic hazard considered (e.g. return period TR). Subsequently, a family of 45 cases was generated from the combination of the four mentioned parameters to show the effectiveness of the triple friction pendulum bearings located at the base of the tanks. The regimes of displacement of the isolation system were configured to address specific response criteria for: SLE, Service Level Event (TR = 72 years); DBE, Design Basis Event (TR = 475 years); and MCE, Maximum Considered Event (TR = 2,475 years). Time-history analyses were performed with 14 pairs of seismic records for different coefficients of friction, effective radii of the pendulum and displacement capacities of the isolators to study the effects of the parameters of the superstructure for different levels of seismic hazard. The main responses of interest were: the base shear, the overturning moment of the walls, the vertical displacement of the waves and the lateral displacement of the base of the tank; where a clear difference between the models was observed based on the effective period (3 and 4 seconds). In addition, it was appreciated that the parameter (H/R) was very influential in all the answers due to its direct relationship with the weight of the structure and its rigidity. The results show that the triple friction pendulum bearings have a good adaptability for different levels of seismic hazard and are effective to mitigate the seismic demand in tanks for liquid storage.
KW - RC liquid storage tanks
KW - time-history analysis
KW - triple pendulum bearing
UR - https://www.scopus.com/pages/publications/105027864285
M3 - Chapter
AN - SCOPUS:105027864285
T3 - World Conference on Earthquake Engineering proceedings
BT - World Conference on Earthquake Engineering proceedings
PB - International Association for Earthquake Engineering
ER -