The design of buried piping systems requires special considerations. In the evaluation of seismic loads on buried piping, the associated stresses are typically considered to be secondary stresses as the piping is assumed to move with the soil during a seismic event and inertial seismic loads are considered to be negligible. During a seismic event, buried pipes are subject to relative displacement-induced strains, induced primarily by seismic wave passage. Typically, the areas of highest stress are found at offset locations as a result of applied moments (primarily due to axial loads into an elbow or tee) and/or at transition locations near entry into buildings or subgrade vaults as a result of seismic anchor movements and/or differential settlement.

This paper examines the relative influence of the number of diameters of straight piping between offsets and the number of diameters of straight piping in between building/vault entry and the first support on resulting seismic piping loads.

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