Performance Assessment of Lead Rubber Bearing System and Triple Friction Pendulum System At Piura's Hospital, in Peru

Abstract eng:
The occurrence of earthquakes has caused significant damage to structural and even nonstructural elements. In hospitals, nonstructural components and contents represent around 92% of a building’s total cost. As such, every effort must be made to reduce such damage. According to the Peruvian design standard (E.030) [1] for earthquake resistance, hospitals must continue to provide services during and after seismic events in accordance with the principle of earthquake-resistant design. A good response has been observed in seismic isolation projects during and after earthquakes for the Caraquez Bay Bridge, Ecuador 2016; the Ishinomaki Red Cross Hospital, Japan 2011; the Military Hospital located in Santiago, Chile 2010; and LNG tanks for the Pampa Melchoritam, Peru 2007. In view of this, one approach to reducing damage to structural and nonstructural elements, components and equipment is the use of seismic isolation devices. Seismic isolation systems have already been implemented in some types of structures in Peru such as hospitals, offices, universities and gas storage tanks, and today, seismic isolation systems in accordance with E.030 [1] standards must be used in hospitals. This study presents an analysis of the performance assessment of a lead rubber bearings system and a triple friction pendulum bearings system at the hospital in Piura. This hospital is located on the northern Peruvian coast in an important city with respect to the economy. It is located in a zone of high seismic activity according to E.030 [1]. Time-history analyses were carried out with nonlinear analytical models taking into account the horizontal components of scaled seismic records obtained from overseas events. Two types of seismic isolation systems at the base of the structure were separately evaluated. The first system was composed of lead rubber bearings (LRB) and the second consisted of triple friction pendulum (TFP) bearings. The performance of these types of isolators was evaluated in terms of seismic isolator response, average floor acceleration, average inter-story drift and average base shear. Special attention was paid to the performance assessment of both seismic isolation systems. This study found that LRB Systems provided a better average floor acceleration response and hysteresis loops than the TFP Systems for undertaking lower bound analysis, while the TFP Systems had better average floor acceleration response and hysteresis loops than the LRB Systems for undertaking upper bound analysis.

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