Response Spectrum 4
Response Spectrum 4 : A graph of the output of a mathematical model which shows how an idealized ensemble of lightly damped, simple harmonic oscillators representing a complete spectrum of short (short periods of vibration) to tall (long periods of vibration) buildings will respond to a particular dynamic ground motion accelerogram. The accelerogram is used to excite the ensemble into vibration in the 0.05-10 seconds period range, the range of interest to engineers. The concept of the response spectrum is used in building codes and the design of essential and critical structures