5. Degrees of Freedom and SDOF
The chapter explores degrees of freedom (DOF) and single-degree-of-freedom (SDOF) systems in the context of seismic engineering. It delves into the definitions, classifications, and importance of DOF in structural analysis. Furthermore, the chapter addresses the idealization of complex structures into SDOF models, their formulation and assumptions, and their applications in seismic design, response spectrum analysis, and time history analysis.
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Sections
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What we have learnt
- A degree of freedom is necessary to define the motion of a system, particularly in structural engineering.
- Lumped mass idealization simplifies mass distribution, allowing for easier dynamic analysis.
- SDOF systems serve as a foundational model for understanding complex structural behaviors in seismic design.
Key Concepts
- -- Degrees of Freedom (DOF)
- The minimum number of independent coordinates required to define the motion of a system, including translational and rotational movements.
- -- Single Degree of Freedom (SDOF) System
- The simplest dynamic model where motion is described using a single coordinate, usually lateral displacement.
- -- Lumped Mass Idealization
- A method where mass is assumed to be concentrated at specific points, usually at floor levels, to simplify dynamic analysis.
- -- Response Spectrum Analysis
- A technique where an SDOF system is subjected to specific ground motion to derive peak responses, aiding in seismic design calculations.
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