Gupta A.K. Response Spectrum Method in Seismic Analysis and Design of Structures

Blackwell Scientific, 1990. — 187.This book devoted to the Response Spectrum Method contains concise sections on a number of the major topics associated with the application of spectrum techniques in analysis and design. Although the theory of spectra has been understood for some extended period of time, it was only in the past twenty years approach was adopted in a major way by the profession for use in engineering practice. This development came about as a result of three major factors, that the theory and background of spectra was more fully understood, theory was relatively simple to understand and use, and because there was for such a simple approach by the building codes and by the advanced techniques needed in the design of nuclear power plants and lifeline systems.
The author rather directly presents his interesting and informative interpretations of various spectrum techniques in the topical chapters. He correctly out that much work remains to be accomplished, which is accurate, for spectra general only depict MAXIMA of various effects, and in many cases, especially where nonlinear effects are to be treated, it is often desirable to know more the response than just a maximum value. Research on such topics presently forward on such matters at a number of institutions, and in time will lead greater understanding of the theory, and to new approaches of application. In this connection one can cite subtle yet important differences in use and interpretation of spectra. For example, the term 'response spectrum' normally is used to a plot of maximum response parameters as a function of frequency or period, a given excitation of the base of a single-degree-of-freedom damped oscillator, for acceleration time history of excitation associated with a specific earthquake. On the other hand a design spectrum is a similar shaped plot selected as representative of some set of such possible or plausible excitations for design; as such it is a characterization of effects that might be expected as of some possible range of excitation inputs, and possibly adjusted to reflect uncertainty considerations, personal safety requirements, economic considerations, nonlinear effects, etc. One can immediately discern the differences, or subtly as may be the case.Structural dynamics and response spectrum
Design spectrum
Combination of modal responses
Response to multicomponents of earthquake
Nonciassically damped systems
Response of secondary systems
Decoupled primary system analysis
Seismic response of buildings
Numerical evaluation of response spectrum