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Reliability-based design of steel moment frame structures isolated by lead-rubber bearing systems

Shoaei, P ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.istruc.2019.06.020
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. This paper puts forward a reliability-based approach to seismic design of steel moment frame structures isolated with lead-rubber bearing (LRB) devices. The system is modeled as an equivalent two-degree-of-freedom system in which the superstructure is assumed to remain elastic, while a bilinear behavior is assigned to the isolation level. Furthermore, the uncertainties associated with the superstructure properties including mass and stiffness are taken into account by adopting appropriate probability density functions. To design the base-isolated structure, the paper proposes “reliability curves” that given a target reliability, return the two key design parameters: the natural period of the super-structure and the target base displacement. Given these two key parameters, the paper proposes a regression equation that predicts the optimal design variables of the base-isolation system, i.e., the initial stiffness and the yield force. This equation is calibrated against a set of optimally-designed base-isolated systems using the genetic algorithm. The proposed approach is showcased for an example steel moment frame structure located in Los Angeles, California. © 2019 Institution of Structural Engineers
  6. Keywords:
  7. Lead-rubber bearing ; Optimization ; Probabilistic model ; Reliability-based design ; Seismic fragility
  8. Source: Structures ; Volume 20 , 2019 , Pages 765-778 ; 23520124 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2352012419301134