Settlement of Combined Piled Raft Foundation of a Nuclear Power Plant in Non-Liquefiable and Liquefiable Soils

Maheshwari, B. K.; Firoj, Mohd

doi:10.2139/ssrn.4385752

Cited by 2 publications

(2 citation statements)

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“…In this study, a typical Indian Nuclear structure model is adopted, similar to Bahuguna and Firoj, 42,43 and the super-structure is lumped at a total height of 72.5 m, as shown in Figure 2B. A circular raft of 22.5 m radius is used on a layered soil domain with a total depth of 30 and 200 m width.…”

Section: Model Description and Materials Propertiesmentioning

confidence: 99%

Analytical plasticity‐based model for soil–structure interaction of lumped system on heterogeneous soil media

Bahuguna,

Firoj

2023

Earthquake Engineering and Resilience

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In the present study, an analytical approach is developed for the soil–structure interaction for the linear, eq. linear and elastic‐perfectly plastic layered soil strata. The amplification factor is calculated at the top of a lumped structure incorporating layered soil, foundation, and super‐structure deformation. The equation of motion of the system under the normalized earthquake excitation is solved using the direct integration method. MATLAB script is developed to carry out the parametric study, and nonlinear time history analysis is performed. The present methodology is compared with the finite element model (FEM), which shows good agreement. The computational time is much less than the FEM method. A parametric study is carried out in terms of soil heterogeneity, mass ratio, slenderness ratio, excitation frequency, and material model. The results indicate that due to the heterogeneity of the soil, the response of the structure is increased significantly; with the increase in the mass ratio, the amplification factor decreases with excitation frequency up to resonance, and the effect of mass ratio is negligible at the higher frequency range; with the increase in slenderness ratio, the amplification factor increases up to resonance, however, at higher frequency ranges there is no effect of slenderness ratio.

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Section: Model Description and Materials Propertiesmentioning

confidence: 99%

Analytical plasticity‐based model for soil–structure interaction of lumped system on heterogeneous soil media

Bahuguna,

Firoj

2023

Earthquake Engineering and Resilience

Self Cite

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“…There is also relevant research examining the uneven settlement of building structures. However, most of these studies on the uneven settlement of building structures primarily concentrate on foundations [22] and soil layers [23,24]. Limited systematic research has been conducted on the deformation and mechanical responses of superstructures during uneven settlement processes Table 1.…”

Section: Introductionmentioning

confidence: 99%

Study on uneven settlement and correction of steel frame structures based on numerical simulation method

Chen,

Guo,

Alqawzai

et al. 2024

PLoS ONE

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Lifting-correction is a technique to restore buildings experiencing uneven settlement, while ensuring the safety and integrity of the main structural system. This study was based on a real light-steel building structure and provided a detailed description of scenarios involving uneven settlement and the process of lifting and correction. Additionally, a sophisticated finite element (FE) model was established using the generic FE software ABAQUS, with refined material constitutive models to ensure the accuracy of simulation results. Firstly, the impact of uneven settlement on the structure was examined, including modal and stress field analyses. Different methods of breaking column (BC) and lifting column (LC) were compared and scrutinized to identify optimal approaches and minimize damage and disturbance to the building. Four methods have been proposed and compared, including simultaneously breaking columns, breaking columns with chessboard style, simultaneously lifting columns and lifting columns in multiple stages. The four methods were comprehensively evaluated from the perspectives of stress fields, displacement responses, damage and energy dissipation. The results indicated that after uneven settlement, the eigenvalues and frequencies of the structure decrease, the structure tended to be unstable. Simultaneously, as stress increases, some joints’ materials enter the yielding stage, affecting the overall structural stability and safety. When damage occurs in some joints, the structural safety was compromised. The comparison between the two BC methods, including the chessboard style and simultaneously BC methods, it was revealed that the former causes less disturbance to structural initial stress field. The comparison between the two LC methods, including, simultaneously and LC in multiple stages, it was revealed that the latter performs slightly better in terms of stress fields, displacement fields, damage, energy dissipation and internal forces. Therefore, the methods of BC in chessboard style and LC in multiple stages were recommended to use in engineering practice to ensure less structural disturbance. The findings obtained from this study can provide guidance for structural engineers to solve the uneven settlement of buildings.

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Settlement of Combined Piled Raft Foundation of a Nuclear Power Plant in Non-Liquefiable and Liquefiable Soils

Cited by 2 publications

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Analytical plasticity‐based model for soil–structure interaction of lumped system on heterogeneous soil media

Analytical plasticity‐based model for soil–structure interaction of lumped system on heterogeneous soil media

Study on uneven settlement and correction of steel frame structures based on numerical simulation method

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