Time–Frequency Filter for Computation of Surface Acceleration for Liquefiable Sites: Equivalent Linear Stockwell Analysis Method

Millen, Maxim; Fonseca, António Viana da; Azeredo, Carlos M.

doi:10.1061/(asce)gt.1943-5606.0002581

Cited by 5 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This step can be achieved through effective stress modelling, either of a one-dimensional soil column or a multidimensional half space, or through simplified models that account for the change in dynamic behavior due to liquefaction. In this work, the Equivalent Linear Stockwell Analysis (ELSA) method, initially proposed in Viana da Fonseca et al (2018) and extended by Millen et al (2021), is used for this purpose. The method makes use of the Stockwell transform to apply time-dependent equivalent linear transfer functions to the input motion to simulate the site response of a liquefying deposit.…”

Section: Estimation Of Surface Ground Motionmentioning

confidence: 99%

“…The method from Millen et al (2021) consists of the eight steps below, as implemented in the Liquepy Python package (Millen and Quintero 2022) 1. Define modulus reduction and damping curves for each layer of soil (Darendeli 2001).…”

Section: Estimation Of Surface Ground Motionmentioning

confidence: 99%

“…5. Using the pore pressure (Step 4) and the strain (Step 3), calculate a pore pressure-adjusted shear modulus and damping in each layer for each time interval using equations from Millen et al (2021). 6.…”

Section: Estimation Of Surface Ground Motionmentioning

confidence: 99%

See 2 more Smart Citations

Macromechanism Approach for Vulnerability Assessment of Buildings on Shallow Foundations in Liquefied Soils

Fonseca

Millen

Quintero

et al. 2023

J. Geotech. Geoenviron. Eng.

Self Cite

View full text Add to dashboard Cite

The damage caused by seismic shaking and liquefaction-induced permanent ground deformation has conventionally been assessed as two separate problems often by different engineers. However, the two problems are inherently linked, since ground shaking causes liquefaction, and liquefaction-induced soil softening affects ground shaking. Modelling both problems within a single numerical model is complex for both the engineer and the software, and most finite element software only have the capabilities to address one of them. To improve the estimates of the seismic performance of buildings on liquefiable soil, a new sub-structuring approach is proposed called the macro-mechanism approach. This approach allows the soil-liquefaction-foundation-structure interaction to be considered in a series of sub-models accounting for the major nonlinear mechanisms of the system at a macro level. The proposed approach was implemented in the open-source finite element software OpenSees and then applied to a case study of a building where significant liquefaction-and shaking-induced damage was observed after the 1999 Mw 7.4 Kocaeli Earthquake. The case study building was also simulated using two different commercial software programs, the finite difference software FLAC, and the finite element software PLAXIS, by two different research teams. A comparison between the results from the macromechanism approach compared to full numerical models shows that the macro-mechanism approach can capture the extent of the foundation deformation and provide more realistic estimates of the building damage than full approaches since the FLAC and PLAXIS models consider elastic elements for the building.

show abstract

Section: Estimation Of Surface Ground Motionmentioning

confidence: 99%

Section: Estimation Of Surface Ground Motionmentioning

confidence: 99%