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A Comprehensive Numerical Based Case Study on Abutment-Foundation-Backfill Behavior of a Railway Bridge

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Abstract

In a railway bridge, the end support system plays a crucial role in resisting both vertical and lateral loadings for which the bridge is essentially designed, warranting a need for regular monitoring and assessing the conditions of the same. In the present investigation, a site-specific case study of a railway bridge in northwest India has been taken into consideration. The Rohtak-Gohana Line Railway Bridge segment includes an overhead viaduct of a busy road and is located in the Indian state of Haryana. A two-dimensional continuum model has been developed to simulate the behavior of the abutment-backfill-pile system of the bridge. Lateral monotonic pushover analysis has been carried out for capacity assessment. Consequently, a comprehensive static load analysis has been carried out to evaluate the global performance as well as system-level performances in location such as pile cap, individual piles, pile-soil interface, abutments, abutment-backfill etc. under different levels of lateral loadings. The findings may be useful for the future safety assessment of the geotechnical components of the rail bridge and the consequent decision on maintenance measures.

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Data Availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

COPDSF:

Code of Practice for the Design of Sub-structures and Foundations

RDSO:

Research Designs & Standard Organizations

SAP:

Structural Analysis Program

GRS:

geosynthethics-reinforced soil

FLAC:

Fast Lagrangian Analysis of Continua

IAB:

integral abutment bridge

ANSYS:

analysis system

OPENSEES:

Open System for Earthquake Engineering Simulation

IRS:

Indian Railway Standard

FEM:

finite element method

EFS:

equivalent flexural stiffness

EAS:

equivalent axial stiffness

PDMY:

pressure-dependent multi-yield

SPT:

standard penetration test

MATLAB:

Matrix Laboratory

n p :

Number of the piles in the out-of-plane direction

I p :

The moment of inertia of a single pile [m4]

E p :

Young’s modulus of a single pile [kPa]

A p :

The cross-sectional area of a single pile [m2]

L c :

The out-of-plane pile cap dimension [m]

δ :

Soil- structure interface angle [degree]

φ :

Soil friction angle

μ :

Friction coefficient

K n :

Normal penalty parameter

K t :

Tangential penalty parameter

K σ :

The overburden effect

τ oct :

Octahedral shear stress [kPa]

γ oct :

Octahedral shear strain

σ xx :

The normal stress component in the X-direction on a plane perpendicular to the X-axis [kPa]

σ yy :

The normal stress component in the Y-direction on a plane perpendicular to the Y-axis [kPa]

σ zz :

The normal stress component in the Z-direction on a plane perpendicular to the Z-axis [kPa]

τ xy :

The shear stress component in the X-Y plane on a plane perpendicular to the X-axis [kPa]

τ yz :

The shear stress component in the Y-Z plane on a plane perpendicular to the Y-axis [kPa]

τ zx :

The shear stress component in the Z-X plane on a plane perpendicular to the Z-axis [kPa]

ε xx :

The normal strain component in the X-direction on a plane perpendicular to the X-axis

ε yy :

The normal strain component in the Y-direction on a plane perpendicular to the X-axis

ε zz :

The normal strain component in the Z-direction on a plane perpendicular to the Z-axis

γ xy :

The shear strain component in the X-Y plane on a plane perpendicular to the X-axis

γ yz :

The shear strain component in the Y-Z plane on a plane perpendicular to the Y-axis

γ zx :

The shear strain component in the Z-X plane on a plane perpendicular to the Z-axis

G :

The shear modulus of soil in octahedral plane [kPa]

γ r :

The reference shear strain at which reference low-strain shear modulus is considered

p r :

The reference mean effective confining pressure [kPa]

p :

The current mean effective confining pressure [kPa]

G oct,r :

The reference low-strain shear modulus defined at pr [kPa]

N 1,60 :

The corrected SPT blow count considering the effect of overburden pressure and 60% energy efficiency of the hammer

ρ :

Density of the soil layer [t/m3]

V s1 :

Shear wave velocity considering the effect of overburden pressure [m/s]

G max :

The low-strain shear modulus at p [kPa]

G max,oct :

The low-strain shear modulus at p in octahedral plane [kPa]

d :

Pressure-dependent coefficient

K o :

Lateral earth pressure ratio at rest

σv :

Effective vertical stress the middle of the layer [kPa]

B oct,r :

The reference low-strain bulk modulus defined at pr [kPa]

ν :

Poisson’s ratio

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Correspondence to Aritra Bagchi.

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Bagchi, A., Raychowdhury, P. A Comprehensive Numerical Based Case Study on Abutment-Foundation-Backfill Behavior of a Railway Bridge. Transp. Infrastruct. Geotech. 11, 1348–1374 (2024). https://doi.org/10.1007/s40515-023-00328-9

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  • DOI: https://doi.org/10.1007/s40515-023-00328-9

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