This series includes technical reports prepared by faculty, students and staff who are associated with the John A. Blume Earthquake Engineering Center at Stanford University. While the primary focus of Blume Center is earthquake engineering, many of the reports in this series encompass broader topics in structural engineering and materials, computational mechanics, geomechanics, structural health monitoring, and engineering life-cycle risk assessment. Each report includes acknowledgments of the specific sponsors for the report and underlying research. In addition to providing research support, the Blume Center provides administrative support for maintaining and disseminating the technical reports. For more information about the Blume Center and its activities, see https://blume.stanford.edu.
Four tall columns at the Richmond Refinery of the Standard Oil Company were investigated in detail. These columns are typical of tall refinery columns in general, and they were selected because they had various heights and configurations. On-site measurements of the behavior of these columns were made under ambient and forced-motion conditions. Suitable test procedures and measurement techniques were developed in the course of the work. Natural frequencies, mode shapes, and damping characteristics were determined from the power spectral density function analysis of the measurements. The platforms, reboilers, and other elements attached to the columns have a significant effect on some of the mode shapes. Damping is relatively small in these structures, generally being 1% of critical damping or less at the levels of vibration used in the tests. The tall columns were modeled mathematically using beam theory, shell theory, and the finite-element method. A major difficulty is presented by the inclusion of the effects of platforms, reboilers, ladders, and the like. Nevertheless, natural frequencies and mode shapes were calculated and compared with the results of the field measurements. All of the results are in reasonably good agreement, but given its simplicity and other advantages, beam theory is concluded to be the most practical approach for the analysis of these tall columns.
Kircher, CA, Czarnecki, RM, Scholl, RE, Shah, HC and Gere, JM. (1978). Seismic Analysis of Oil Refinery Structures, Part 1 - Experimental and Analytical Studies of Tall Columns. John A. Blume Earthquake Engineering Center Technical Report 31. Stanford Digital Repository. Available at: http://purl.stanford.edu/cj676tv9437
Scholl, RE, Czarnecki, RM, Kircher, CA, Shah, HC and Gere, JM. (1978). Seismic Analysis of Oil Refinery Structures, Part II - Evaluation of Seismic Design Criteria. John A. Blume Earthquake Engineering Center Technical Report 32. Stanford Digital Repository. Available at: http://purl.stanford.edu/zz855yq1681
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