Seismic Support: Speedy Determination of Frequency

by Anil K. Kar, (M.ASCE), Sr. Engr.; Ebasco Services, Inc., New York, N.Y.,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 7, Pg. 1289-1306

Document Type: Journal Paper


Seismic restraints are provided to support safety-related electrical cable trays or conduits and HVAC ductwork in nuclear power plant structures. It is shown that most of these restraints, in the form of frames, can be represented by single-degree-of-freedom models for analysis and design. Approximate formulas, based on the stiffness of the SDOF models, are presented to determine the natural frequencies very quickly and reliably. The formulas have the added advantage of demonstrating the contribution of different members to the frequency of a frame. The use of the formulas, presented in the paper, can considerably simplify the dynamic analysis of seismic supports for electrical cables and HVAC ducts in nuclear power plant and other structures.

Subject Headings: Cables | Electric power | Power plants | Seismic tests | Seismic effects | Structural safety | Frames | Nuclear safety

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