A methodology for fragility analysis of buried water pipes considering coupled horizontal and vertical ground motions

Zhang, Wenyang; Shokrabadi, Mehrdad; Bozorgnia, Yousef; Taciroğlu, Ertuǧrul

doi:10.1016/j.compgeo.2020.103709

Cited by 12 publications

(9 citation statements)

References 41 publications

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“…Please note that the outside boundary of the DRM layer coincides with the PML interface and the validity of such configuration has been demonstrated in our prior studies. [ 31–33 ]

\begin{matrix} true \\ right P^{e f f} = ([], \begin{matrix} P_{i}^{eff} \\ P_{b}^{e f f} \\ P_{e}^{e f f} \end{matrix}) = ([], \begin{matrix} bold0 \\ - {boldM}_{b e}^{Ω +} {\overset{u}{true}}_{e}^{0} - {boldC}_{b e}^{Ω +} {\overset{u}{true}}_{e}^{0} - {boldK}_{b e}^{Ω +} {boldu}_{e}^{0} \\ + {boldM}_{e b}^{Ω +} {\overset{u}{true}}_{b}^{0} + {boldC}_{e b}^{Ω +} {\overset{u}{true}}_{b}^{0} + {boldK}_{e b}^{Ω +} {boldu}_{b}^{0} \end{matrix}), \end{matrix}

where the subscripts

_{i}

_{b}

, and

_{e}

refer to the nodes inside the domain of interest, along the inside and outside boundary of the one layer of DRM elements, respectively. The terms

u^{0}

and

P^{e f f}

, respectively, denote the free‐field displacements and forces along nodes of the one layer of DRM elements, which can be obtained by using analytical solutions just derived, for a given ground motion time‐history.…”

Section: Methodsmentioning

confidence: 99%

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3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

Zhang

Taciroğlu

2021

Earthq Engng Struct Dyn

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Numerous experiments and prior analyses have confirmed that the angle of incidence of a seismic wave can significantly affect ground response and dynamic soil-structure interaction (SSI) behavior. Realistically, obliquely incident waves will be generated due to the soil heterogeneity and stratigraphy, which can lead into complex wave propagation and scattering patterns. In this study, we propose a novel methodology that (i) utilizes the wave potential theory to derive the 3D time-domain analytical solutions for free-field response under obliquely incident SV waves in layered soil media; (ii) makes use of high-fidelity numerical tools-namely, the domain reduction method (DRM) and the perfectly matched layers (PMLs)-to inject the obliquely incident waves into the domain of interest and to absorb the outgoing scattered motions, respectively; (iii) enables nonlinear time-domain site response and SSI analyses that feature an advanced constitutive model for soil. Finally, a 3D 20-story steel building is modeled as a case study. The building rests on a two-layer half-space and is subjected to an obliquely incident seismic wave. The SV wave's angles of incidence are varied to investigate its effects on structural responses, such as horizontal, vertical, and rotational floor accelerations, as well as interstory drift ratios.

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“…Please note that the outside boundary of the DRM layer coincides with the PML interface and the validity of such configuration has been demonstrated in our prior studies. [ 31–33 ]

\begin{matrix} true \\ right P^{e f f} = ([], \begin{matrix} P_{i}^{eff} \\ P_{b}^{e f f} \\ P_{e}^{e f f} \end{matrix}) = ([], \begin{matrix} bold0 \\ - {boldM}_{b e}^{Ω +} {\overset{u}{true}}_{e}^{0} - {boldC}_{b e}^{Ω +} {\overset{u}{true}}_{e}^{0} - {boldK}_{b e}^{Ω +} {boldu}_{e}^{0} \\ + {boldM}_{e b}^{Ω +} {\overset{u}{true}}_{b}^{0} + {boldC}_{e b}^{Ω +} {\overset{u}{true}}_{b}^{0} + {boldK}_{e b}^{Ω +} {boldu}_{b}^{0} \end{matrix}), \end{matrix}

where the subscripts

_{i}

_{b}

, and

_{e}

refer to the nodes inside the domain of interest, along the inside and outside boundary of the one layer of DRM elements, respectively. The terms

u^{0}

and

P^{e f f}

Section: Methodsmentioning

confidence: 99%

“…Please note that the outside boundary of the DRM layer coincides with the PML interface and the validity of such configuration has been demonstrated in our prior studies. [31][32][33] =…”

Section: Drm-pml Systemmentioning

confidence: 99%

3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

Zhang

Taciroğlu

2021

Earthq Engng Struct Dyn

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“…3, the pseudo spectra accelerations (PSA) of all five GM record sets accurately match the input target spectrum. More details concerning this GM selection process can be found in (Zhang et al 2020).…”

Section: Ground Motionsmentioning

confidence: 99%

Nonlinear seismic fragility assessment of tall buildings equipped with tuned mass damper (TMD) and considering soil-structure interaction effects

Zhang¹,

Liu

Shokrabadi

et al. 2022

Bull Earthquake Eng

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Tuned mass dampers (TMDs) are widely implemented in many types of structures, such as tall buildings, wind turbines, towers, and bridges, to enhance the structural performance subjected to seismic and wind loading. In the present study, we aim to comprehensively investigate the effectiveness of TMD, by performing seismic vulnerability assessment of a 20-story steel building equipped with TMD and considering the soil-structure interaction (SSI) effects. A suite of high-fidelity three-dimensional nonlinear finite element simulations-in which nonlinear constitutive models are adopted for both structural components and soil, and Domain Reduction Method (DRM) and Perfectly Matched Layer (PML) are utilized to inject the seismic ground motions and represent the semi-infinite contents of the soil media, respectively-are conducted to obtain the structural responses. Finally, the performance of TMD is examined by comparing the fragility curves obtained under different conditions, i.e., with and without TMD, with and without SSI. It is observed that the TMD can notably decrease the structural demands, while the SSI effects can increase the fragility of structures, especially under strong earthquakes.

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“…Predicting accurate earthquake‐induced ground motions is a fundamental component for many earthquake engineering applications, including seismic hazard and risk analysis, 1 nonlinear time‐history analysis of both under‐ and above‐ground structures, 2 seismic loss and resilience assessment of buildings and infrastructure systems, 3 and development of ground motion models (GMMs) 4,5 . In the past few decades, empirical GMMs have become a prevalent approach for ground motion characterization, mainly due to their simplicity and low computational cost.…”

Section: Introductionmentioning

confidence: 99%

“…above-ground structures, 2 seismic loss and resilience assessment of buildings and infrastructure systems, 3 and development of ground motion models (GMMs). 4,5 In the past few decades, empirical GMMs have become a prevalent approach for ground motion characterization, mainly due to their simplicity and low computational cost.…”

mentioning

confidence: 99%

A suite of broadband physics‐based ground motion simulations for the Istanbul region

Zhang

Crempien

Kurtuluş

et al. 2023

Earthq Engng Struct Dyn

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Physics-based earthquake ground motion simulations (GMS) have acquired significant growth over the last two decades, mainly due to the explosive developments of high-performance computing techniques and resources. These techniques benefit high/medium seismicity regions such as the city of Istanbul, which presents insufficient historical ground motion data to properly estimate seismic hazard and risk. We circumvent this reality with the aid of the Texas Advanced Computing Center (TACC) facilities to perform a suite of 57 highfidelity broadband (8-12 Hz) large-scale physics-based GMS for a region in Istanbul, Turkey. This paper focuses on the details of simulated GMS: (i) validation of the GMS approach against recorded ground motions produced by the 2019 𝑀 𝑤 5.7 Silivri earthquake; (ii) characteristics of 57 different source models, which aim to consider the uncertainties of many fault rupture features, including the length and width, dip, strike, and rake angles of considered fault planes, as well as hypocenter locations and earthquake magnitudes ranging between 𝑀 𝑤 6.5 and 7.2; (iii) high-resolution topography and bathymetry and seismic data that are incorporated into all GMS; (iv) simulation results, such as PGAs and PGVs versus 𝑉 𝑠30 and distances to fault ruptures (𝑅 rup ), of 2912 surface stations for all 57 GMS. More importantly, this research provides a massive database of displacement, velocity and acceleration time histories in all three directions over more than 20,000 stations at both surface and bedrock levels. Such site-specific highdensity and -frequency simulated ground motions can notably contribute to the seismic risk assessment of this region and many other applications.

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A methodology for fragility analysis of buried water pipes considering coupled horizontal and vertical ground motions

Cited by 12 publications

References 41 publications

3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

Nonlinear seismic fragility assessment of tall buildings equipped with tuned mass damper (TMD) and considering soil-structure interaction effects

A suite of broadband physics‐based ground motion simulations for the Istanbul region

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