Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seismic fragility analysis of free-spanning submarine pipelines incorporating soil spatial variability in soil-pipe interaction and offshore motion propagation
Highlights Analysis framework for the seismic fragility of FSSPs considering soil spatial variability is proposed. Ignoring soil spatial variability can result in a lower estimation of soil spring stiffness. Ignoring soil spatial variability can significantly overestimate the site amplification effect of offshore motions. Ignoring soil spatial variability can substantially overestimate the seismic fragilities of FSSPs. A prediction model of is developed to simply consider the impact of soil spatial variability on seismic performance of FSSPs.
Abstract Geotechnical engineering problems are always faced with various sources of uncertainty, especially the uncertainties of soil properties. This paper presents the seismic fragility analysis of free-spanning submarine pipelines (FSSPs) with consideration of soil spatial variability. Firstly, the two-dimensional random field theory is employed to account for the spatial distribution characteristics of soil properties, and the levels of spatial variability are shifted by changing the autocorrelation lengths. Then, based on the generated random field data, the finite element (FE) models of the soil-pipe system are established and the offshore spatial motions applied to pipelines are stochastically synthesized. Meanwhile, the impacts of soil spatial variability on the soil-pipe interaction and offshore motion propagation are investigated. Next, the probabilistic seismic demand models of FSSPs are derived via dynamic analyses and statistical regression, and the seismic fragility curves are generated. The influence of soil spatial variability on the seismic performance of FSSPs is examined by comparing the fragility curves between the random-field and random-variable cases. Finally, a fast assessment method for the ultimate bearing capacity is proposed to simply incorporate soil spatial variability in the seismic performance estimation of FSSPs. Numerical results highlight the necessity of incorporating soil spatial variability in seismic fragility analysis of FSSPs. The proposed assessment method can provide a great convenience for designers and engineers to obtain the accurate ultimate bearing capacity of FSSPs or other underground structures in the preliminary stage of seismic design.
Seismic fragility analysis of free-spanning submarine pipelines incorporating soil spatial variability in soil-pipe interaction and offshore motion propagation
Highlights Analysis framework for the seismic fragility of FSSPs considering soil spatial variability is proposed. Ignoring soil spatial variability can result in a lower estimation of soil spring stiffness. Ignoring soil spatial variability can significantly overestimate the site amplification effect of offshore motions. Ignoring soil spatial variability can substantially overestimate the seismic fragilities of FSSPs. A prediction model of is developed to simply consider the impact of soil spatial variability on seismic performance of FSSPs.
Abstract Geotechnical engineering problems are always faced with various sources of uncertainty, especially the uncertainties of soil properties. This paper presents the seismic fragility analysis of free-spanning submarine pipelines (FSSPs) with consideration of soil spatial variability. Firstly, the two-dimensional random field theory is employed to account for the spatial distribution characteristics of soil properties, and the levels of spatial variability are shifted by changing the autocorrelation lengths. Then, based on the generated random field data, the finite element (FE) models of the soil-pipe system are established and the offshore spatial motions applied to pipelines are stochastically synthesized. Meanwhile, the impacts of soil spatial variability on the soil-pipe interaction and offshore motion propagation are investigated. Next, the probabilistic seismic demand models of FSSPs are derived via dynamic analyses and statistical regression, and the seismic fragility curves are generated. The influence of soil spatial variability on the seismic performance of FSSPs is examined by comparing the fragility curves between the random-field and random-variable cases. Finally, a fast assessment method for the ultimate bearing capacity is proposed to simply incorporate soil spatial variability in the seismic performance estimation of FSSPs. Numerical results highlight the necessity of incorporating soil spatial variability in seismic fragility analysis of FSSPs. The proposed assessment method can provide a great convenience for designers and engineers to obtain the accurate ultimate bearing capacity of FSSPs or other underground structures in the preliminary stage of seismic design.
Seismic fragility analysis of free-spanning submarine pipelines incorporating soil spatial variability in soil-pipe interaction and offshore motion propagation
Pan, Haiyang (Autor:in) / Li, Hong-Nan (Autor:in) / Li, Chao (Autor:in)
Engineering Structures ; 280
11.01.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Modelling Pipe-Soil Interaction for Offshore Pipelines in Sand
| British Library Conference Proceedings | 1999
Free vibrations of free spanning offshore pipelines
| Elsevier | 2013
Free vibrations of free spanning offshore pipelines
| Online Contents | 2013
Soil-pipe end interaction analysis for seismic isolation pipelines crossing fault
| British Library Online Contents | 2008