Abstract
Based on a framework of Probabilistic Seismic Demand Analysis, a nonlinear dynamic model of a reinforced concrete (RC) building was established to obtain a demand hazard curve that considers multidimensional performance limit states (MPLSs), including combinations of peak floor acceleration and interstory drift. A definition of the two limit states is expressed using a generalized MPLSs equation. The peak floor acceleration and the interstory drift were considered to be dependent and were assumed to follow a bidimensional lognormal distribution. The maximum interstory drift and the maximum peak floor acceleration were calculated using Increment Dynamic Analysis and nonlinear time history analysis. The numerical formula for a demand hazard curve of the modelled building was then derived by coupling the bidimensional lognormal distribution with the ground motion hazard curve. The uncertainties involved in MPLSs and structural parameters, as well as the different threshold values for peak floor acceleration, were further considered to determine the sensitivity of demand hazard curves. The analysis results showed that the proposed method can be used to describe the damage performance of various building structures, which are sensitive to multiple response parameters including drift and acceleration. Moreover, it was demonstrated in this study that the demand hazard curves were relatively conservative if the coefficient of variation, the peak floor acceleration threshold, the interaction factor N IDR and added stiffness, were appropriately selected.
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Abbreviations
- MPLSs:
-
Multidimensional performance limit states
- IDA:
-
Incremental Dynamic Analysis
- PSDA:
-
Probabilistic Seismic Demand Analysis
- PSHA:
-
Probabilistic seismic hazard analysis
- EDP:
-
Engineering Demand Parameter
- PDF:
-
Probability density function
- IDR :
-
The maximum interstory drift
- PFA :
-
The maximum peak floor acceleration
- IM :
-
Intensity measures
- S a (T 1):
-
Spectral acceleration
- idr :
-
Threshold value of the interstory drift limit state
- pfa :
-
Threshold value of the peak floor acceleration limit state
- idr lim :
-
Interstory drift limit state
- Pfa lim :
-
Peak floor acceleration limit state
- \( idr_{{{\text{rand\,lim}},i}} \) :
-
A random threshold value of the interstory drift limit state at the ith performance level
- \( pfa_{{{\text{rand}}\lim ,i}} \) :
-
A random threshold value for the peak floor acceleration limit state at the ith performance level
- \( idr_{{{\text{fixed}}\lim ,i}} \) :
-
A deterministic threshold value of the interstory drift limit state at the ith performance level
- \( pfa_{{{\text{fixed}}\lim ,i}} \) :
-
A deterministic threshold value for the peak floor acceleration limit state at the ith performance level
- idr lim,ij :
-
A deterministic interstory drift limit state at the ith performance level
- pfa lim,j :
-
The jth fixed peak floor acceleration limit state
- ɛ :
-
Uncertainties of ground motion and epistemic uncertainty
- Y :
-
Uncertainties of structural system characteristics
- N IDR , N PFA :
-
Interaction factor determining the shape of the surface of 2D limit state
- Ω:
-
The one-dimensional failure domain of the structure
- D :
-
The two-dimensional failure domain
- \( \mu_{IDR |IM = im} \) :
-
The log-mean of interstory drift
- \( \sigma_{IDR |IM = im} \) :
-
The log-standard deviation of interstory drift
- μ PFA|IM = im :
-
The log-mean of peak floor acceleration
- σ PFA|IM = im :
-
The log-standard deviation of peak floor acceleration
- ρ :
-
The correlation coefficient
- cv:
-
The coefficient of variation
- \( f\left( {IDR,PFA |IM = im} \right) \) :
-
PDF of a bivariate lognormal distribution
- f(IDR):
-
PDF of the interstory drift
- \( f(idr_{{{\text{rand\,lim}},i}} ) \) :
-
PDF of interstory drift limit state
- P(IDR > idr|IM = im):
-
The hazard fragility function
- P(IDR > idr, PFA > pfa|IM = im):
-
A two-dimensional hazard fragility function
- λ IM (im):
-
Seismic hazard function of the site originated from PSHA
- v IDR (idr):
-
The mean annual frequency of exceeding the interstory drift limit state
- v IDR,PFA (idr, pfa):
-
The mean annual frequency of exceedance that includes two limit states
- \( v_{IDR} (idr_{{{\text{rand\,lim}},i}} ) \) :
-
The mean annual frequency of exceeding the random interstory drift limit state
- v IDR,PFA (idr lim,ij , pfa lim,j ):
-
The mean annual frequency of exceeding ith fixed interstory drift limit state when the effect of jth acceleration threshold is considered
- \( v_{IDR,PFA} (idr_{{{\text{rand}}\lim ,i}} ,pfa_{{{\text{rand}}\lim ,i}} ) \) :
-
The mean annual frequency of exceeding two randomly independent/interdependent limit states
- \( P[idr < IDR(Y = y,IM,\varepsilon ) ] \) :
-
The probability of structural damage in the design working life
- \( P[idr < IDR(Y = y,IM,\varepsilon ),pfa ] \) :
-
The probability of structural damage that reflects two performance limit states
- \( P[idr_{\lim ij} < IDR(Y = y,IM,\varepsilon ),pfa_{\lim ,j} ] \) :
-
The probability of structural damage when the effect of jth acceleration threshold is considered
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Acknowledgments
The research support from the National Natural Science Foundation of China (51278420) and Graduate Starting Seed Fund of Northwestern Polytechnical University (Z2014114) were greatly appreciated.
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Liu, X.X., Wu, ZY. & Liang, F. Multidimensional performance limit state for probabilistic seismic demand analysis. Bull Earthquake Eng 14, 3389–3408 (2016). https://doi.org/10.1007/s10518-016-0013-6
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DOI: https://doi.org/10.1007/s10518-016-0013-6