Seismic Design and Risk Analyses of Safe-to-Fail Steel and RC Frames for Nuclear Facilities

https://doi.org/10.5614/jts.2024.31.2.1

Authors

  • Sindur P. Mangkoesoebroto Structural Engineering Research Group, Civil Engineering Department, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung
  • Shandy Rianto Centre for Industrial Research, Institute of Technology Bandung

Keywords:

Safe-to-fail, concrete and steel frames, fragility, collapse risk, earthquake, time history analysis

Abstract

Abstract

In this article, the design and estimate of the collapse risk of safe-to-fail steel and reinforced concrete (RC) frames due to earthquakes were proposed. The frames are part of nuclear facility buildings, and their failures are to follow the safe-to-fail beam side-sway collapse mechanism. The safe-to-fail was dictated by allowing plastic hinges to form merely in beams and few in columns; no other failure but flexure was tolerated such as shear, local or lateraltorsional buckling. Two types of safe-to-fail frames were studied, one with special moment frame (SMF) and the other with ordinary moment frame (OMF). The design was elaborated, and the fragility-based collapse risks were estimated and compared. Nonlinear time history analyses were carried out to evaluate the structural performance. The analyses showed that the safe-to-fail OMF had lower collapse risk than the safe-to-fail SMF for both steel and concrete frames. The steel safe-to-fail OMF showed superior behaviours.

Keywords: Safe-to-fail; concrete and steel frames; fragility; collapse risk; earthquake; time history analysis.

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Published

2024-08-22