Earthquake Response of Buried Insulated Pipes

by Aly Hindy, Engr.; Stone & Webster, Toronto, Canada,
Milos Novak, (M.ASCE), Prof.; Univ. of Western Ontario, Ontario, Canada,


Serial Information: Journal of the Engineering Mechanics Division, 1980, Vol. 106, Issue 6, Pg. 1135-1149


Document Type: Journal Paper

Abstract: The effect of insulation on axial stresses induced in straight buried pipes due to earthquakes is investigated theoretically. Complex soil reactions are formulated for a viscoelastic medium composed of a softer inner ring and a stiffer outer layer. Seismic response of pipes is analyzed using both distributed and lumped mass models. The excitation is represented by traveling harmonic waves, fully-correlated transient waves, and partially-correlated random ground motion. It is found that insulation always reduces the stresses in straight pipes but this reduction is not as great as might be expected.

Subject Headings: Buried pipes | Building insulation | Axial forces | Earthquakes | Ground motion | Soft soils | Viscoelasticity | Seismic tests

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