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– Fragility surface with vectorized IM is a continuous function showing the probability of exceedance of a certain LS conditioned on two IM parameters. For such a system the fragility definition in Eq.25.1 should be replaced with [143]: Fragility = P [LS|IM1 = im1,IM2 = im2] (25.4) The two IMs can be among un-scalable parameters, e.g. <Mw,Rrup >
- Incremental Dynamic Analysis
- Multiple Stripe Analysis
- Cloud Analysis
In this method, each ground motion is scaled successively to multiple IM levels and the maximum EDP is computed at each scale level [950]. The IDA curve connects the resulting EDPs corresponding to each ground motion, usually based on the spline fitting [951]. Using IDA results, the percentiles of response can be calculated as continuous curves, e....
Instead of selecting a fixed set of ground motions and scaling them (i.e., IDA), the analyses can be performed in several discrete SILs. Having three or more SILs in this new method is called multiple stripe analysis (MSA) [251]. If the analyses are performed for one or two stripes, the method is called single stripe analysis (SSA) and double strip...
CLA is a procedure in which the structure is subjected to a (relatively large) set of (un-scaled or as-recorded) ground motions and is analyzed numerically. If the ground motion records are taken from a bin, they can represent an earthquake scenario defined by (Mbin, Rbin), the magnitude and distance representative of the bin [522]. Then from the r...
The efficiency of various IM is compared. Uncertainties associated with scalar-IM fragility curves and vector-IM fragility functions are also compared and discussed. The question whether vector-valued fragility functions lead to a reduction of uncertainty depends on the IM. In the present case study, a fragility surface based on PGA and PGA/PGV
Jan 5, 2023 · Of the vector-valued Ims based on this spectral shape parameter, Np EI turns out to be the most consistent throughout the analyses, because in Figure 8h an appropriate behavior can be seen again on the fragility surface by significantly influencing the probability of failure as the vector-valued IM increases, this gives certainty to its efficiency as an estimator of the structural response ...
Feb 1, 2023 · (5) Significant difference is observed between the scalar 2D fragility curve and the 3D fragility surface developed by the optimum scalar- and vector-valued IMs, which indicates that the direct consideration of scalar-valued IM to produce fragility curves should be careful. Besides, the scalar fragility curve has a tendency to underestimate or exaggerate earthquake hazards.
Jun 22, 2009 · This results in an equation for a fragility surface that offers a more complete and accurate view of the structure´s vulnerability. ... once using PGA, and once more Sa(T1) as the IM, and then a ...
Jan 5, 2023 · surface is also obtained compared to the other vector-valued IM. For the case of Np Sv (Fig- ure 8g), it results in a consider able similarity with resp ect to the vector - valued IM s based
