Abstract
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.
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