Composite-System Approach for Seismic Analysis of Secondary Systemsby Takeru Igusa, Univ of California, Berkeley, Dep of, Civil Engineering, Berkeley, CA, USA,
Armen Der Kiureghian, Univ of California, Berkeley, Dep of, Civil Engineering, Berkeley, CA, USA,
Document Type: Proceeding Paper
Part of: Structural Engineering in Nuclear Facilities
An accurate and efficient method for seismic analysis of multiply supported, multi-degree-of-freedom secondary subsystems is developed. The method accurately accounts for the effects of tuning, interaction, non-classical damping, and spatial coupling which are inherent characteristics of composite primary-secondary systems. The method consists of two steps: (a) synthesis of the modal properties of the composite primary-secondary system in terms of the known modal properties of the two subsystems, and (b) determination of the secondary subsystem response in terms of the derived modal properties and the ground response spectrum. The method is efficient since it avoids large eigenvalue solutions and time-history calculations.
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