Seismic Risk Assessment an Vulnerability Curve Development of Buildings Equipped with Lead Rubber Bearing Isolation Systems During Their Lifetime Under Probable Mainshock-Aftershock Scenarios in Tehran

Document Type : Research Article

Author

Assistant Professor, Earthquake Engineering Group, Civil Engineering Department, KN Toosi University of Technology, Tehran, Iran.

Abstract

This research deals with the application of lead rubber bearing isolation systems in reducing the seismic risk of buildings located in Tehran metro city from technical and economic points of view. In this regard, first, three separate 5-, 10-, and 15-story buildings with the steel moment resisting frames system are considered. These models are designed in two separate scenarios: with and without the base isolation system. Next, all the active faults of Tehran and its sur-rounding area are considered to generate the probable earthquake scenarios in the 50-year life span of the buildings. This simulation contains the probable mainshock-aftershock event scenarios and the corresponding accelerograms for each of the generated events. Afterward, by adopting the Monte-Carlo simulation technique, an adequate number of random earthquake hazard scenarios are generated. Then, the buildings’ performances are evaluated under mainshock-aftershock sequences using the nonlinear dynamic time history analysis approach. In addition, by using the damage and loss models considering the fatality and injury, building physical damage, and time-dependent economic losses, the lifetime seismic risks of buildings are estimated. The outcomes highlight that the lead rubber bearing system is well capable of improving the building behavior and hence reducing the life-cycle cost of buildings tangibly which will be elaborated in this paper.

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