Incorporating modeling uncertainties in the assessment of seismic collapse risk of buildings

Liel, Abbie B.; Haselton, Curt B.; Deierlein, Gregory G.; Baker, Jack W.

doi:10.1016/j.strusafe.2008.06.002

Cited by 398 publications

(298 citation statements)

References 15 publications

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“…The epistemic or modeling uncertainty (β modeling ) is mainly due to lack of knowledge about the real properties of the structural elements. To combine the record-to-record and modeling uncertainties, the mean estimates approach (Liel et al 2009) assumes that the two uncertainties are lognormally distributed and independent, such that the total uncertainty, β Total , is given by: …”

Section: Collapse Evaluationmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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Abstract:The potential of post-tensioned self-centering moment-resisting frames (SCMRFs) and viscous dampers to reduce the collapse risk and improve the residual drift performance of steel buildings in near-fault regions is evaluated. For this purpose, a prototype steel building is designed using different seismic-resistant frames, i.e.: moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as stiffness and strength deterioration. A database of 91 nearfault, pulse-like ground motions with varying pulse periods is used to conduct incremental dynamic analysis (IDA), in which each ground motion is scaled until collapse occurs. The probability of collapse and the probability of exceeding different residual story drift threshold values are calculated as a function of the ground motion intensity and the period of the velocity pulse. The results of IDA are then combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess and compare the collapse risk and the residual drift performance of the different seismic-resistant frames. The paper highlights the benefit of combining the post-tensioning and supplemental viscous damping technologies in the near-source. In particular, the SC-MRF with viscous dampers is found to achieve significant reductions in collapse risk and probability of exceedance of residual story drift threshold values compared to the MRF.

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Section: Collapse Evaluationmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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“…It is associated with nonlinear modeling, based on the evaluation of the accuracy and robustness of the nonlinear models used and their ability to represent the true physical properties and the seismic response of structures. In order to combine the contributions of aleatory and epistemic uncertainties, the mean estimates approach is used herein [42]. When the record-to-record uncertainties are only considered, the structural response is well-described by a lognormal distribution, with a median, θ, and standard deviation, β RTR .…”

Section: Collapse Evaluationmentioning

confidence: 99%

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Kamaris¹,

Tzimas²,

Karavasilis³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…They describe the relationship between earthquake hazard and the structural response expressed as engineer design parameters (e.g., maximum inter-story drift, maximum displacement). Peak ground acceleration (PGA) (Shinozuka et al 2000;Sasani et al 2002;Choun and Elnashai 2010;Garcia and Soong 2003;Banerjee and Shinozuka 2008) and pseudo-spectral acceleration (PSA) (Gardoni and Rosowski 2009;Liel et al 2009;Ellingwood et al 2007;Lin et al 2013a;Jalayer et al 2015) are among the most widely used intensity measures in fragility analysis. Two major issues regarding fragility are discussed in this paper and solutions to overcome them are sought.…”

Section: Introductionmentioning

confidence: 99%

An earthquake-source-based metric for seismic fragility analysis

Radu

Grigoriu

2018

Bull Earthquake Eng

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The seismic fragility of a system is the probability that the system enters a damage state under seismic ground motions with specified characteristics. Plots of the seismic fragilities with respect to scalar ground motion intensity measures are called fragility curves. Recent studies show that fragility curves may not be satisfactory measures for structural seismic performance, since scalar intensity measures cannot comprehensively characterize site seismicity. The limitations of traditional seismic intensity measures, e.g., peak ground acceleration or pseudo-spectral acceleration, are shown and discussed in detail. A bivariate vector with coordinates moment magnitude m and source-to-site distance r is proposed as an alternative seismic intensity measure. Implicitly, fragility surfaces in the (m, r)-space could be used as graphical representations of seismic fragility. Unlike fragility curves, which are functions of scalar intensity measures, fragility surfaces are characterized by two earthquake-hazard parameters, (m, r). The calculation of fragility surfaces may be computationally expensive for complex systems. Thus, as solutions to this issue, a bi-variate log-normal parametric model and an efficient calculation method, based on stochastic-reduced-order models, for fragility surfaces are proposed.

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Incorporating modeling uncertainties in the assessment of seismic collapse risk of buildings

Cited by 398 publications

References 15 publications

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

An earthquake-source-based metric for seismic fragility analysis

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