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IS 2810:1979 is the Indian Standard (BIS) for glossary of terms relating to soil dynamics. IS 2810 provides a comprehensive glossary of standard terms and definitions relating to soil dynamics, machine foundations, and vibration analysis. It is intended to ensure uniform terminology across geotechnical investigations, seismic analysis, and dynamic structural design.
! Ensure terms used in dynamic analysis and soil investigation reports align with IS 2810 to avoid technical or contractual ambiguities.
! Serves as an essential companion document when interpreting provisions of IS 2974 (Machine Foundations) and IS 5249 (In-situ dynamic properties of soil).
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International Equivalents
Similar International Standards
ASTM D653-23ASTM International, USA
HighCurrent
Standard Terminology Relating to Soil, Rock, and Contained Fluids
Provides a comprehensive, continually updated terminology for geotechnical engineering, including a dedicated section on dynamic properties.
EN 1997-1:2004CEN (European Committee for Standardization), Europe
MediumCurrent
Eurocode 7: Geotechnical design - Part 1: General rules
Defines key geotechnical terms and symbols in the context of design, with some overlap on fundamental dynamics concepts.
ISO 4866:2010ISO (International Organization for Standardization)
MediumCurrent
Mechanical vibration and shock — Vibration of fixed structures — Guidelines for the measurement of vibrations and evaluation of their effects on structures
Defines core vibration and dynamics terms (frequency, amplitude, resonance) that are foundational to soil dynamics.
Key Differences
≠IS 2810:1979 is a static document from 1979, whereas standards like ASTM D653 are 'living documents' frequently updated to include modern concepts like cyclic mobility, advanced in-situ testing terms (e.g., SCPT), and refined liquefaction terminology.
≠IS 2810 defines several 'lumped' coefficients for foundation response (e.g., Coefficient of Elastic Uniform Compression, Cu) which are less common in modern international practice, which favors using fundamental soil properties like Shear Modulus (G) and Young's Modulus (E).
≠International standards like Eurocode 7 and the ASTM suite have tightly integrated terminology; terms in ASTM D653 are used consistently across dozens of related testing and design standards. The integration of IS 2810 with other Indian standards, while present, can be less consistent due to varying revision dates of the codes.
≠While IS 2810 is a dedicated glossary, major international codes like Eurocode 7 embed their key definitions within the design standard itself, linking terminology directly to design application.
Key Similarities
≈The fundamental physical principles and definitions for a single-degree-of-freedom (SDOF) system, such as free vibration, forced vibration, damping, and natural frequency, are conceptually identical across all standards.
≈Core parameters essential for any dynamic analysis, specifically Shear Modulus (G) and Damping Ratio (D or ξ), are defined and recognized as fundamental properties in both IS 2810 and international standards.
≈The mathematical definition of Logarithmic Decrement (δ) as a method to determine damping in a freely vibrating system is consistent across both IS 2810 and international glossaries like ASTM D653.
≈The primary purpose of IS 2810 and its international counterparts is the same: to establish a standardized, unambiguous vocabulary to ensure clear communication among geotechnical professionals.
Parameter Comparison
Parameter
IS Value
International
Source
Resonance
A state where any small change in excitation frequency causes a decrease in the system's response (i.e., the peak of the response curve).
The condition where a small change in excitation frequency causes a large change in the vibratory response.
ASTM D653-23
Damping Ratio (Symbol)
Primarily uses the symbol 'D' to represent the ratio of actual to critical damping (c/cc).
Commonly uses the symbol 'ξ' (xi), although 'D' is also recognized. 'ξ' is more prevalent in modern academic and international texts.
General International Practice / EN 1997-1
Coefficient of Elastic Uniform Compression (Cu)
Defined as the load per unit area for a unit elastic compression. It's a key parameter for block foundation analysis.
This specific term is not widely used. The concept is represented by the 'Modulus of Subgrade Reaction (ks)' or derived from fundamental elastic properties (E, ν).
General Geotechnical Practice
Shear Modulus (G)
The ratio of shear stress to corresponding shear strain below the proportional limit.
The ratio of shear stress to the corresponding shear strain. The phrase 'below the proportional limit' is often omitted as the modulus is recognized to be strain-dependent.
ASTM D653-23
Logarithmic Decrement (δ)
The natural logarithm of the ratio of any two successive amplitudes of like sign in free vibration decay.
The natural logarithm of the ratio of any two successive amplitudes of like sign, in the decay of a single-degree-of-freedom system with viscous damping. (Definition is identical).
ASTM D653-23
Magnification Factor
Ratio of the amplitude of motion in forced vibration to the static displacement that would be produced by the static force vector.
The ratio of the vibratory-response amplitude of a system to the static-response amplitude. (Essentially an identical definition).
ASTM D653-23
⚠ Verify details from original standards before use
Key Values0
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