Chapter 5
Earthquake Design and Analysis


The primary purpose of the seismic design of high-hazard facilities is to construct them so that there is no excessive exposure as a result of radiation or toxic substance release to the public and collocated workers. A major earthquake in relatively close proximity to the site may cause major damage to conventionally designed industrial facilities. For this purpose, a more stringent seismic design is usually required than would be required for conventional facilities to minimize potential for loss of structural and leak-tight integrity. For conventional facilities, in some cases ensuring the operability and life safety of its occupants is usually the primary concern, while for high-hazard facilities the confinement of radiological or toxic substances is the primary concern.

  • 5.1 Introduction
  • 5.1.1 Purpose of Seismic Design
  • 5.1.2 Seismic Design Procedures
  • 5.2 Earthquake Physical Phenomena
  • 5.2.1 Faults
  • 5.2.2 Focus and Epicenter Ground Motion
  • 5.2.3 Attenuation of Motion with Distance from the Epicenter
  • 5.2.4 Intensity
  • 5.2.5 Magnitude
  • 5.2.6 Seismic Hazard Curve
  • 5.3 Seismic Load Definition
  • 5.3.1 Static
  • Seismic Forces
  • Seismic Relative Static Displacements
  • Component and Systems Supports and Anchorage
  • 5.3.2 Equivalent Static
  • 5.3.3 Dynamic-Response Spectrum Modal Analysis
  • 5.3.4 Dynamic Time History
  • Equations of Motion
  • Modal Analysis
  • 5.4 Response Spectra
  • 5.4.1 Ground
  • Nuclear
  • Petrochemical and Biomedical
  • 5.4.2 Floor or in-Structure
  • 5.4.3 Equipment
  • 5.5 Determination of Seismic Loads on Structural Systems
  • 5.5.1 Introduction
  • 5.5.2 Cantilever Systems
  • Illustrative Problem
  • ASCE 7-05 Computations of Seismic Forces
  • Equivalent Static Analysis
  • Response Spectrum Modal Analysis
  • Dynamic Time History Modal Analysis
  • Dynamic Time History Direct Integration Analysis
  • Summary of Air Tank Analysis Results
  • 5.5.3 Piping Continuous Over Multiple Support Systems
  • Static
  • ASCE-7 Method of Design
  • Equivalent Static
  • Dynamic
  • Modal Response Spectrum S Analysis
  • Time History Modal Analysis
  • Time History Direct Integration
  • Summary
  • 5.6 Coupled Versus Uncoupled Dynamic Analysis of Mechanical (Secondary) Systems
  • 5.7 Development and use of Spacing Tables and Charts for Seismic Design of Piping and other Distribution Systems
  • 5.7.1 Introduction
  • 5.7.2 Development of Lateral Support Spacing and Inertia Acceleration
  • Span Lengths
  • Allowable Stresses
  • Seismic Loading
  • 5.7.3 Design Charts for Various Pipe Configurations
  • Derivation of the Charts
  • Use of Charts
  • 5.8 References

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