This report covers the seismic analysis of buried pipelines. The main focus herein shall be on the analysis of pipelines at building penetrations. To analyze buried pipelines at the pipeline structure interface a new computer modeling technique is used. Using SAP2000 (Computer and Structures, Inc., Berkeley, CA), a finite element analysis program, the buried pipeline is modeled as a pipe supported by springs. This method of analysis is versatile, and can be used for the design of new pipelines, the analysis of existing pipelines, and for pipeline failure investigations. The springs were designed to linearly model the properties of the soil supporting the pipeline. The pipeline is run between two structures. The structures are modeled using a lumped mass and a spring with a stiffness greater than the soil springs. The pipeline was subjected to the N-S horizontal component of the 1940 El Centro earthquake. Dynamic analyses were performed using time history analysis techniques. These results are compared with dynamic analyses that model the structure as a fixed support. Various parameters such as soil spring stiffness, structure lumped mass and structure spring stiffness were varied and their effects on the behavior of the pipeline discussed. The structure mass and spring model predicts higher pipeline deflections, forces and moments than does the traditional fixed end support model.
Seismic analysis of buried pipelines
1999
10 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
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