Fragility functions of different groups of diagonally reinforced concrete coupling beams (DRCBs)

Sang Whan Han, Hyeyoung Koh, Chang Seok Lee

Research output: Contribution to journalArticle

Abstract

Diagonally reinforced concrete coupling beams (DRCBs) act as a fuse element that dissipates most of the seismic energies imparted to coupled shear wall systems during earthquakes. The objective of this study is to develop the fragility functions of different groups of DRCBs: (1) all DRCBs, (2) DRCBs conforming to the ACI 318-14 (Building code requirements for structural concrete and commentary (ACI 318-14), American Concrete Institute, Farmington Hills, 2014) confinement options A and B, and (c) DRCBs not conforming to the ACI 318-14 confinement options. Forty-three specimens were collected from nineteen previous experimental studies to estimate their empirical fragility using four different damage states. It was found that maximum shear stress (υmax) played an important role in the fragility curves. Without considering υmax, the fragility of DRCBs was significantly underestimated for DRCBs with υmax < 4.0 whereas their fragility was overestimated for DRCBs with υmax > 4.0. In this study, fragility curves were constructed considering the level of υmax. Mean chord rotations (μθ) of DRCB specimens were estimated for life safety and collapse prevention limit states, and compared to corresponding limiting values specified in ASCE 41-17 (Seismic evaluation and retrofit of existing buildings, American Society of Civil Engineers, Reston, 2017. https://doi.org/10.1061/9780784414859). DRCBs conforming to the ACI 318-14 confinement options produced μθ larger than the limiting values whereas μθ of DRCBs not conforming to the ACI 318-14 did not exceed the limiting values.

Original languageEnglish
Pages (from-to)165-187
Number of pages23
JournalBulletin of Earthquake Engineering
Volume18
Issue number1
DOIs
StatePublished - 2020 Jan 1

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reinforced concrete
Reinforced concrete
Concretes
Shear walls
seismic energy
Electric fuses
fuses
shear stress
curves
Shear stress
Earthquakes
experimental study
engineers
safety
earthquakes
Engineers
earthquake
damage
shear
requirements

Keywords

  • Confinement option
  • Damage state
  • Diagonally reinforced concrete beam
  • Fragility function
  • Limiting drift

Cite this

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abstract = "Diagonally reinforced concrete coupling beams (DRCBs) act as a fuse element that dissipates most of the seismic energies imparted to coupled shear wall systems during earthquakes. The objective of this study is to develop the fragility functions of different groups of DRCBs: (1) all DRCBs, (2) DRCBs conforming to the ACI 318-14 (Building code requirements for structural concrete and commentary (ACI 318-14), American Concrete Institute, Farmington Hills, 2014) confinement options A and B, and (c) DRCBs not conforming to the ACI 318-14 confinement options. Forty-three specimens were collected from nineteen previous experimental studies to estimate their empirical fragility using four different damage states. It was found that maximum shear stress (υmax) played an important role in the fragility curves. Without considering υmax, the fragility of DRCBs was significantly underestimated for DRCBs with υmax < 4.0 whereas their fragility was overestimated for DRCBs with υmax > 4.0. In this study, fragility curves were constructed considering the level of υmax. Mean chord rotations (μθ) of DRCB specimens were estimated for life safety and collapse prevention limit states, and compared to corresponding limiting values specified in ASCE 41-17 (Seismic evaluation and retrofit of existing buildings, American Society of Civil Engineers, Reston, 2017. https://doi.org/10.1061/9780784414859). DRCBs conforming to the ACI 318-14 confinement options produced μθ larger than the limiting values whereas μθ of DRCBs not conforming to the ACI 318-14 did not exceed the limiting values.",
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Fragility functions of different groups of diagonally reinforced concrete coupling beams (DRCBs). / Han, Sang Whan; Koh, Hyeyoung; Lee, Chang Seok.

In: Bulletin of Earthquake Engineering, Vol. 18, No. 1, 01.01.2020, p. 165-187.

Research output: Contribution to journalArticle

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