Seismic Vulnerability Assessment of RC Frame Structures Using 3D Analytical Models

Moon, Do-Soo; Lee, Young‐Joo; Lee, Sangmok

doi:10.5762/kais.2016.17.9.724

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The design concrete ultimate strength was 24 MPa, and the in-place strength of concrete was assumed to have a normal distribution of a mean of 33.6 MPa and a coefficient of variation of 18.6% based on the findings of Bartlett and MacGregor (1996). The reinforcement was designed with grade 40 steel, and the yield strength of reinforcing steel was assumed to follow a normal distribution with a mean of 337 MPa and a coefficient of variation of 10.7%, as suggested from the strength test results of steel bars performed by Mirza and MacGregor (1979) and adopted in several studies (Lu et al 2005;Kwon and Elnashai 2006;Moon et al 2016). Table 4 summarizes the statistical properties of the random variables considered in the study.…”

Section: Definition Of Uncertainty and Limit Statementioning

confidence: 99%

“…With significant structural damages and losses observed during past destructive earthquakes (Anderson 1987;Ellingwood 1980;DesRoches et al 2011;Elnashai et al 2010a;Motosaka and Mitsuji 2012;Rosenblueth 1986;Rossetto and Peiris 2009), many researchers have made great efforts to evaluate the seismic vulnerability of various structures so that the extent of structural damage can be predicted in advance and further minimized (Calvi et al 2006). In this regard, a seismic fragility curve has been widely used as a probabilistic indicator of structural safety against earthquake hazards (Moon et al 2016). A seismic fragility curve, or seismic vulnerability curve, is expressed as conditional failure probabilities meeting a predefined damage state criteria for different levels of ground motion intensity (Ellingwood 2001); it shows how well a structure performs during earthquake events as a graphical representation of seismic risk (Rossetto and Elnashai 2003).…”

Section: Introductionmentioning

confidence: 99%

“…When simplified analytical models can properly represent seismic behavior of target structures, they give valid seismic fragility curves with a substantial reduction in simulation time. In case of plan-regular space structures, two-dimensional analytical models can be used in deriving effective and efficient seismic vulnerability curves (Moon et al 2016). However, in many cases, simplified models may be inadequate to assess seismic performance of structures and their seismic vulnerability.…”

Section: Introductionmentioning

confidence: 99%

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Fragility Analysis of Space Reinforced Concrete Frame Structures with Structural Irregularity in Plan

Moon

Lee

2018

J. Struct. Eng.

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Because significant damages to structures having structural irregularity in their plans were repeatedly observed during many past earthquakes, there have been great research efforts to evaluate their seismic vulnerability. Although most of the previous studies used simplified structural representations such as one-dimensional or two-dimensional models in the fragility analysis of plan-irregular structures, simple analytical models could not represent true seismic behavior from the complicated nonlinear coupling between lateral and torsional responses as the degree of irregularity increased. For space structures with high irregularity, more realistic representations such as threedimensional models are needed for proper seismic assessment. However, the use of computationally expensive models is not practically feasible with existing approaches of fragility analysis. Thus, in this study, a different approach is adopted that can produce vulnerability curves efficiently, even with a three-dimensional model. In this approach, an integrated computational framework is established that combines reliability analysis and structural analysis. This enables evaluation of the limit-state faction without constructing its explicit formula, and the failure probability is calculated with the first-order reliability method (FORM) to deal with the computational challenge. Under the integrated framework, this study investigates the seismic vulnerability of space reinforced concrete frame structures with varying plan irregularity. Material uncertainty is considered, and more representative seismic fragility curves are derived with their three-dimensional analytical models. The effectiveness of the adopted approach is discussed, and the significant effect of structural irregularity on seismic vulnerability is highlighted.

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