Abstract
In this study, a new formulation for structural fragility function based on the theory of state-based philosophy (SBP) is introduced. In this innovative approach, gradual changes in stiffness (or flexibility) of the structure is considered as a firm base for describing changes in the state of the structure due to damage from various sources. In this study, the source of damage data is considered ground motions. After formulating state changes by using SBP theory, a new fragility function is proposed. Therefore, this new function is based on observations of various failure stages of the structure and, besides, it is organized specifically for the structural damage data. In order to prove the accuracy of this method, some special moment frames (SMFs) are modeled, and incremental dynamic analysis (IDA) is performed on them. Thus damage data are provided as initial input to the fragility function. After that, the final results of the SBP fragility function are compared with the results of the conventional methods of plotting the fragility curve, and lastly, the fragility curve’s accuracy obtained by using this new function is verified. This new fragility function is called ‘SBP fragility function’ and has some advantages over the ordinary fragility functions, which are discussed in this article.
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Abbreviations
- CDF:
-
Cumulative distribution function
- CP:
-
Collapse prevention
- CV:
-
Coefficient of variation
- CVerr:
-
Cross-validation error
- EDP:
-
Engineering demand parameter
- Err:
-
Error
- F R :
-
SBP fragility function
- IDA:
-
Incremental dynamic analysis
- IO:
-
Immediate occupancy
- IM:
-
Intensity measure
- k N :
-
Dimensionless stiffness of the structure (structural stiffness coefficient)
- K S :
-
Dimensioned stiffness of the structure
- k S :
-
Stiffness of the intact structure
- LS:
-
Life safety
- MDOF:
-
Multi degree of freedom
- MLE:
-
Maximum likelihood estimation
- MM:
-
Method of moments
- NC:
-
Not considered
- p :
-
First SBP power factor
- PBEE:
-
Performance-based earthquake engineering
- PDF:
-
Probability distribution function
- PEER:
-
Pacific earthquake engineering research
- PGA:
-
Peak ground acceleration
- PGV:
-
Peak ground velocity
- P(ξ):
-
First SBP auxiliary function
- q :
-
Second SBP power factor
- Q(ξ):
-
Second SBP auxiliary function
- SBP:
-
State-based philosophy
- SD:
-
Standard deviation
- SDOF:
-
Single degree of freedom
- SMF:
-
Special steel moment frame
- St:
-
Story
- SSE:
-
Sum of squared error
- ξ :
-
State variable
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Baharvand, A., Ranjbaran, A. Seismic Fragility Functions Grounded on State-Based Philosophy: Application to Low to Midrise Steel Frame Buildings. KSCE J Civ Eng 24, 1787–1798 (2020). https://doi.org/10.1007/s12205-020-0350-5
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DOI: https://doi.org/10.1007/s12205-020-0350-5