Design of Hazardous Mechanical Structures, Systems and Components for Extreme Loads
10 Seismic Evaluation of Buried Pipelines, Tunnels and Vaults
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Buried pipeline systems are commonly used to transport water necessary for heat removal and fire protection safety function for hazardous facilities. In some instances they may also conduct radioactive or other toxic and pathogenic fluids.
Safety-related cables such as emergency power supply and instrumentation and control lines between buildings are often routed in buried reinforced-concrete tunnels or vaults. All these types of structures are referred to in this chapter as buried systems.
These buried systems are often required to remain functional in case of an earthquake not exceeding a design-basis earthquake. This means that failure modes are considered that may induce large deformation in the pipes, tunnels or vaults; or that may produce pipe, tunnel or vault support failure; or that may produce tunnel or vault wall or roof collapse over the pipes or cables.