Seismic Response of Pipes Supported on Complex Framesby 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,
Abstract: 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: Structural analysis | Seismic tests | Seismic effects | Pipes | Pipelines | Structural behavior | Frames | Industrial facilities
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