文档介绍：Control of seismic response of
piping systems ponents
in power plants by base isolation
James M. Kelly
Department of Civil Engineering, University of California, Berkeley, California 94 720,
USA
Daniel E. Chitty
Applied Nucleonics Engineers 1nc, Santa Monica, California, USA
(Received August 19 70)
Standard approaches to the aseismic design of piping systems -
ponents for power plants - such as the floor spectrum method - are
costly and neglect equipment-structure interaction. Such interaction has
recently been shown to be severe when the natural frequency of -
ponent is close or equal to one of the natural frequencies of the primary
structure - a situation referred to as tuning and one almost ~ertain tO.
occur in a large structural system. A base isolation system :is described
that has been demonstrated to reduce dramatically the accelerations
induced in structures under earthquake motion. A series of further experi-
ments is described in the paper; this experimental work demonstrates that
the response of equipment in structures so isolated is also greatly reduced.
Thus, sensitive internal equipment can be protected directly from seismic
attack; interaction need not be considered and inelastic analyses need not
be performed during the design process. Due to rigid body action of the
primary system above the base isolation system, multiple support response
spectra design methods are not needed. It is anticipated that the use of
base isolation will reduce the cost of the design and construction of power
ponents, piping systems, and structures.
Introduction equipment at attachment points. Each analysis is deter-
An important consideration in the design of nuclear and, ministic and many must be performed to reflect the
recently, geothermal power plants in seismically active probabilistic nature of the problem. A plica-
regions is the assurance of the structural integrity of essen- tion