Abstract
Dynamic soil structure interaction (DSSI) as a topic of research has been under focus for last 40 years or more. However, despite its significant development, it has hardly impacted the practice in industry as DSSI shows attenuation of response in soft soil based on the commercially available software that are usually used for computation of structural response. Present paper re-looks at some of the established theories and examines some of the popular myth that has been allied to the topic. It also proposes three analytical models that can well be adapted in practice to arrive at a more realistic result without enhancing the computational cost. Analysis based on the proposed models show that present perception regarding DSSI requires serious re-evaluation.
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Abbreviations
- A:
-
Integration constant
- B:
-
Integration constant
- c1, c2,…, cn :
-
Element damping
- Cs :
-
Seismic coefficient
- C1–C4 :
-
Integration constants
- \( [{\mathbf{C}}] \) :
-
Damping matrix
- E:
-
Young’s modulus of structural element
- g:
-
Acceleration due to gravity
- G:
-
Shear modulus of soil
- i:
-
Mode number
- I:
-
Importance factor/moment of inertia
- {I}:
-
Identity matrix
- J0, Jf :
-
Mass moment of inertia
- k:
-
Stiffness of fixed base structure kN/m
- Kx, \( \bar{k}_{x} \) :
-
Translational stiffness of foundation kN/m
- Kθ, \( \bar{k}_{\theta } \) :
-
Rotational stiffness of foundation kN m/rad
- Ke :
-
Effective stiffness of soil structure system kN m/rad
- \( \left[ {\mathbf{K}} \right] \) :
-
Stiffness matrix of structure
- \( \hat{K} \) :
-
Frequency dependent dynamic stiffness of soil
- L:
-
Length
- \( \left( {\frac{{L_{i} }}{{M_{i} }}} \right) \) :
-
Modal mass participation factor
- mi :
-
Lumped nodal mass
- \( [{\mathbf{M}}] \) :
-
Mass matrix
- Mf :
-
Moment in foundation
- P:
-
Externally applied force
- P i :
-
Nodal force in ith mode
- rx, rθ :
-
Frequency or time ratio in translation and rotation
- R:
-
Response reduction factor
- t:
-
Time
- \( \hat{T} \) :
-
Effective time period of soil structure system
- T:
-
Time period fixed based structure/kinetic energy
- ue :
-
Effective amplitude of soil structure system
- uf :
-
Effective amplitude of foundation
- uθ :
-
Effective displacement of foundation in rotation
- U:
-
Potential energy
- {U i }:
-
Global displacement
- v:
-
Velocity
- V:
-
Fixed base shear
- VDSSI :
-
Base shear considering DSSI effect
- Vi:
-
Base shear in ith mode
- \( \bar{V} \) :
-
Reduced base shear
- W:
-
Weight of structure
- x,y,z:
-
Cartesian co-ordinate
- Z:
-
Zone factor
- Β :
-
Damping ratio of structure
- β 0 :
-
Damping ratio of foundation
- \( \bar{\beta } \) :
-
Damping ratio of soil–structure system
- δ :
-
Displacement
- ϕ :
-
Scaling or eigen vector
- κ :
-
Modal participation factor
- θ :
-
Angular rotation of foundation
- ω :
-
Natural frequency
- ζ :
-
Damping ratio
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Chowdhury, I., Ghosh, A. & Dasgupta, S.P. Dynamic Soil Structure Interaction of Structures Resting on Soil Under Earthquake Motion. Indian Geotech J 46, 85–103 (2016). https://doi.org/10.1007/s40098-015-0153-7
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DOI: https://doi.org/10.1007/s40098-015-0153-7