The effect of irregular seismic loading on the validity of the simplified liquefaction procedures

Soil liquefaction has been one of the major hazards for civil engineering projects relating to earthquakes. The simplified liquefaction procedure which is used to assess liquefaction susceptibility in practice is still based on semi-empirical methods. These rely on the assumption that irregular seis...

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Autores principales:	Norambuena,Raúl, Tsaparli,Vasiliki, Kontoe,Stavroula, Taborda,David, Potts,David
Lenguaje:	Spanish / Castilian
Publicado:	Universidad Católica de la Santísima Concepción 2019
Materias:	licuefacción metodología simplificada análisis de elementos finitos número equivalente de ciclos plasticidad de superficie límite
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132019000100042
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spelling	oai:scielo:S0718-281320190001000422019-07-17The effect of irregular seismic loading on the validity of the simplified liquefaction proceduresNorambuena,RaúlTsaparli,VasilikiKontoe,StavroulaTaborda,DavidPotts,David licuefacción metodología simplificada análisis de elementos finitos número equivalente de ciclos plasticidad de superficie límite Soil liquefaction has been one of the major hazards for civil engineering projects relating to earthquakes. The simplified liquefaction procedure which is used to assess liquefaction susceptibility in practice is still based on semi-empirical methods. These rely on the assumption that irregular seismic motions can be represented fully by an equivalent number of cycles of uniform stress amplitude, which is based on the peak acceleration measured at ground surface. Most methodologies used to calculate the equivalent number of cycles are based on Miner's damage concept developed for the fatigue analysis of metals. Several researchers have questioned the validity of this concept, as soils have a highly non-linear response. The present work investigates numerically the concept of the equivalent uniform amplitude cycles. Effective stress-based non-linear finite element analyses are performed with a modified bounding surface plasticity model that allows to realistically simulate liquefaction, reproducing the cyclic strength of sands accurately. The seismic response of a 15 m deep uniform level-ground sand deposit is simulated with full hydro-mechanical coupling to establish the benchmark extent of liquefaction zone. In parallel, the analyses are repeated assuming drained conditions to compute the irregular time-histories, which are then converted to an equivalent number of uniform amplitude cycles. The constant amplitude series are then applied in single element simple shear test simulations, with initial conditions those corresponding to the 7 m depth in the deposit. The results in terms of the predicted triggering of liquefaction are contrasted to the predictions of the fully coupled benchmark analyses at the corresponding depth to assess the validity of the Seed et al. (1975) methodology, based on Miner's cumulative damage concept.info:eu-repo/semantics/openAccessUniversidad Católica de la Santísima ConcepciónObras y proyectos n.25 20192019-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132019000100042es10.4067/S0718-28132019000100042
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	licuefacción metodología simplificada análisis de elementos finitos número equivalente de ciclos plasticidad de superficie límite
spellingShingle	licuefacción metodología simplificada análisis de elementos finitos número equivalente de ciclos plasticidad de superficie límite Norambuena,Raúl Tsaparli,Vasiliki Kontoe,Stavroula Taborda,David Potts,David The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
description	Soil liquefaction has been one of the major hazards for civil engineering projects relating to earthquakes. The simplified liquefaction procedure which is used to assess liquefaction susceptibility in practice is still based on semi-empirical methods. These rely on the assumption that irregular seismic motions can be represented fully by an equivalent number of cycles of uniform stress amplitude, which is based on the peak acceleration measured at ground surface. Most methodologies used to calculate the equivalent number of cycles are based on Miner's damage concept developed for the fatigue analysis of metals. Several researchers have questioned the validity of this concept, as soils have a highly non-linear response. The present work investigates numerically the concept of the equivalent uniform amplitude cycles. Effective stress-based non-linear finite element analyses are performed with a modified bounding surface plasticity model that allows to realistically simulate liquefaction, reproducing the cyclic strength of sands accurately. The seismic response of a 15 m deep uniform level-ground sand deposit is simulated with full hydro-mechanical coupling to establish the benchmark extent of liquefaction zone. In parallel, the analyses are repeated assuming drained conditions to compute the irregular time-histories, which are then converted to an equivalent number of uniform amplitude cycles. The constant amplitude series are then applied in single element simple shear test simulations, with initial conditions those corresponding to the 7 m depth in the deposit. The results in terms of the predicted triggering of liquefaction are contrasted to the predictions of the fully coupled benchmark analyses at the corresponding depth to assess the validity of the Seed et al. (1975) methodology, based on Miner's cumulative damage concept.
author	Norambuena,Raúl Tsaparli,Vasiliki Kontoe,Stavroula Taborda,David Potts,David
author_facet	Norambuena,Raúl Tsaparli,Vasiliki Kontoe,Stavroula Taborda,David Potts,David
author_sort	Norambuena,Raúl
title	The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
title_short	The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
title_full	The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
title_fullStr	The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
title_full_unstemmed	The effect of irregular seismic loading on the validity of the simplified liquefaction procedures
title_sort	effect of irregular seismic loading on the validity of the simplified liquefaction procedures
publisher	Universidad Católica de la Santísima Concepción
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132019000100042
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The effect of irregular seismic loading on the validity of the simplified liquefaction procedures

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