Seismic Response of Pipes Supported on Complex Frames

by Ahmad F. Kabir, URS/John A. Blume Associates, San, Francisco, CA, USA,
Said Bolourchi, URS/John A. Blume Associates, San, Francisco, CA, USA,
Stephen J. Eder, URS/John A. Blume Associates, San, Francisco, CA, USA,

Document Type: Proceeding Paper

Part of: Recent Applications in Computational Mechanics


Analytical approaches and modeling techniques used to calculate seismic responses of piping systems, supported on complex open-frame structures, are evaluated. Seismic responses are obtained by the commonly used cascade analysis method for large-bore and small-bore pipe systems which are typically found in large industrial facilities. These responses are compared to those generated by a rigorous coupled analysis of the pipe-support structure system to assess whether adequate conservatism is preserved in the cascade analysis procedure. It is concluded that the cascade analysis may not be conservative for some large-bore pipes which have relatively similar stiffness as the supporting open-frame system. Cascade analysis, however, seems to be conservative for small-bore pipes, as their dynamic properties do not significantly influence the dynamic behavior of the supporting frame structure.

Subject Headings: Pipelines | Seismic tests | Seismic effects | Pipes | Frames | Structural analysis | Industrial facilities | Structural dynamics

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