Journal: Earthquake Engineering & Structural Dynamics

Abbreviation

Earthquake Engng Struct Dyn.

Publisher

Wiley

Journal Volumes

ISSN

0098-8847
1096-9845

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Publications 1 - 10 of 58
  • Seismic response of a cross interchange metro station in soft soil: Physical and numerical modeling
    Item type: Journal Article
    Wu, Weifeng; Ge, Shiping; Yuan, Yong; et al. (2021)
    Earthquake Engineering & Structural Dynamics
    The expansion of the Shanghai metro grid leads to a growing demand for underground stations. This paper studies the seismic performance of a typical cross interchange station in soft soil, combining shaking table testing and numerical modeling. The cross interchange station is composed of a three-storey section, rigidly connected to a perpendicular two-storey section, leading to an abrupt change of stiffness in the conjunction area. A series of 1 g shaking table tests are conducted, using synthetic model soil (a mixture of sand and sawdust) and granular concrete with galvanized steel wires to model the soil-structure system. The experimental results are then used as a benchmark, allowing for validation of a 3D finite element (FE) model. The validated FE model is shown to compare adequately well with the shaking table tests and is subsequently used to indirectly extrapolate the results to prototype scale. The combined experimental and numerical study allows deriving insights on the dynamic response of cross interchange stations. A key conclusion is that the abrupt change of stiffness at the conjunction area leads to concentration of racking deformation at the bottom storey. This leads to significant stress concentrations on the station sidewall in the same area, revealing the increased seismic vulnerability due to the induced stiffness discontinuity. Seismic damage can be avoided by increasing the reinforcement ratio in such critical locations or by introducing deformable joints. © 2021 John Wiley & Sons Ltd.
  • Data-driven post-earthquake rapid structural safety assessment
    Item type: Journal Article
    Goulet, James-Alexandre; Michel, Clotaire; Kiureghian, Armen Der (2015)
    Earthquake Engineering & Structural Dynamics
  • Simplified method for real-time seismic damage assessment of motorway bridges: Transverse direction - Accounting for abutment stoppers
    Item type: Journal Article
    Sakellariadis, Lampros; Agalianos, Athanasios; Anastasopoulos, Ioannis (2018)
    Earthquake Engineering & Structural Dynamics
  • Rolling and rocking of rigid uplifting structures
    Item type: Journal Article
    Bachmann, Jonas; Vassiliou, Michalis F.; Stojadinovic, Bozidar (2019)
    Earthquake Engineering & Structural Dynamics
  • Structure-soil-structure interaction (SSSI) of adjacent buildings with shallow foundations on liquefiable soil
    Item type: Journal Article
    Kassas, Konstantinos; Adamidis, Orestis; Anastasopoulos, Ioannis (2022)
    Earthquake Engineering & Structural Dynamics
    This paper studies the effect of structure-soil-structure interaction (SSSI) on the seismic response of neighboring structures with shallow foundations on liquefiable sand. The problem is studied through coupled hydromechanical analyses. Nonlinear soil response is modeled with PM4Sand, calibrated on the basis of soil element tests of Hostun sand. The numerical methodology has been compared against six centrifuge model tests, showcasing its ability to predict the settlements. Three idealized structures of width B are considered, of different aspect ratio and foundation bearing pressure q, founded on two liquefiable layer depths, D-L/B = 1 and 2. Initially, the response of a single building is studied, offering insights on the developing failure mechanisms. While the settlement increases with q in the case of a deep (D-L/B = 2) layer, this is not the case for the shallow (D-L/B = 1) layer, where the increased soil confinement leads to the development of a stiffer soil column, which offers increased support to the structure. Pairs of identical structures are subsequently analysed, revealing the effect of SSSI on settlement (w) and rotation (& thetasym;). While its effect on w is beneficial, its effect on & thetasym; is detrimental, leading to a dramatic increase compared to the single structure. The detrimental effect of SSSI on theta is shown to be a function of the gap (s/B) between the buildings and the depth of the liquefiable layer (D-L/B). In the case of the shallow layer, the two structures rotate away from each other. This is not the case of the deeper layer, where they may either rotate away or towards each other, depending on s/B.
  • Finite element modeling of free-standing cylindrical columns under seismic excitation
    Item type: Journal Article
    Katsamakas, Antonios A.; Vassiliou, Michalis F. (2022)
    Earthquake Engineering & Structural Dynamics
    Rocking motion is notoriously sensitive to the parameters that define it, with experimental tests oftentimes being non-repeatable. Therefore, validating numerical models using a deterministic approach is impossible, since the consistency of any benchmark experimental test is dubious. Three-dimensional rocking is even harder to predict than planar rocking. This paper presents a three-dimensional finite element model to predict the statistics of the rocking/sliding response of free-standing cylindrical columns. The response parameters of interest were the maximum displacement at the top of the columns and the residual displacement. Three different columns with varying slenderness and size were examined. The columns were able to slide, rock, and wobble in all directions, with this behavior being representative of building components and monumental structures. The numerical results were statistically compared to a large database of experimental tests, proving the accuracy of the proposed model. The influence of all modeling and physical parameters was elucidated, employing a large number of non-linear time-history analyses. It is shown that, when the numerical parameters are varied within a reasonable range, they do not influence the statistics of the response, even though they influence each individual oscillation. The friction coefficient between the interfaces (physical parameter) can influence the statistics of the response and should be carefully selected. Energy dissipation should be modeled explicitly, following the physics of the problem.
  • Regional variation of spectral parameters for seismic design from broadband probabilistic seismic hazard analysis
    Item type: Journal Article
    Weatherill, Graeme A.; Danciu, Laurentiu (2018)
    Earthquake Engineering & Structural Dynamics
  • An experimental validation of time domain system identification methodswith fusion of heterogeneous data
    Item type: Journal Article
    Chatzis, Manolis N.; Chatzi, Eleni; Smyth, A.W. (2015)
    Earthquake Engineering & Structural Dynamics
  • Post-earthquake damage assessment using residual displacements
    Item type: Journal Article
    Yazgan, Ufuk; Dazio, Alessandro (2012)
    Earthquake Engineering & Structural Dynamics
  • Seismic resilience assessment and improvement framework for electrical substations
    Item type: Journal Article
    Liang, Huangbin; Blagojević, Nikola; Xie, Qiang; et al. (2023)
    Earthquake Engineering & Structural Dynamics
    Experience from previous earthquakes shows that electrical substations are the most vulnerable components within the power transmission system. Thus, their disaster resilience is essential for providing electric power to communities in earthquake-prone regions. In this study, a quantitative framework was proposed to assess the seismic resilience of electrical substations. The functionality of a substation was quantified using its maximum allowable transmission capacity that integrates the substation topology, redundancy level, line capacity, and power balance. The network model of the substation was developed to investigate how component damage affects substation's functionality. Substation's recovery was simulated as a time-stepping process, in which at each time step the substation's ability to provide transmission capacity was conditioned on the functionality state of its components, whose recovery depends on the availability of repair crews and spare parts. The uncertainty of the resilience assessment was quantified by considering the uncertainty in the component-level vulnerability and recoverability. The impacts of components' robustness, repair resource constraints, and post-earthquake recovery scheduling on substation resilience were investigated by modifying components' seismic fragility curves, available recovery resources, and repair priorities. A case study was conducted on a real-world 220/110 kV step-down substation, and a parametric analysis was carried out to investigate the effect of various seismic resilience improvement strategies to demonstrate the applicability of the proposed framework in seismic disaster risk reduction and management.
Publications 1 - 10 of 58