readme.txt

生成地震波 可以参考一下大家 是我从网上找到的

* see bug_rpt.txt for additional information about this program

Program: SIMQKE-1

Title: Simulation of Earthquake Ground Motions

Developer: E.H. Vanmarcke, C.A. Cornell, D.A. Gasparini, and S.N. Hou,
Department of Civil Engineering, Massachusetts Institute of Technology, 
Cambridge, Massachusetts 1976.

Modified: T.F. Blake, Newbury Park, California [PC DOS version] 1990.

Category: Strong Motion Data Processing

Platform: PC DOS, MS Fortran v.4.1;
 
Reference: Gasparini, D.A., and E.H. Vanmarcke, "Simulated Earthquake
Motions Compatible With Prescribed Response Spectra," Department of Civil
Engineering, Research Report R76-4, Masschusetts Institute of Technology,
Cambridge, Massachusetts, January 1976. 

Vanmarcke, E.H., "Structural Response to Earthquakes," Chapter 8 in 
"Seismic Risk and Engineering Decisions," Edited by C. Lomitz and E. 
Rosenblueth, published by Elsevier Publishing Co., Amsterdam, 1976.

Summary: SIMQKE-1 generates statistically independent accelerograms, 
performs a baseline correlation on the generated motions to ensure zero 
final ground velocity, and calculates response spectra. One of the options
in the program generates ground motions whose response spectra "match", 
or are compatible with, a set of specified smooth response spectra. The 
basis for the spectrum compatible motion generation is the relationship 
between the response spectrum values for arbitrary damping and the 
"expected" Fourier amplitudes of the ground motion (Vanmarcke, 1976). 
The earthquakes are synthesized by superimposing sinusoidal components 
with pseudo-random phase angles, and by multiplying the resulting 
stationary trace by a user specified function representing the variation 
of ground motion intensity with time. The program SIMQKE-1 also has the 
capability to adjust, by iteration, the ordinates of the spectral density
function to improve the agreement between computed and specified response
spectra. Even without the last step, the average response spectrum (of a 
set of simulated motions) will match the smooth target spectrum very 
closely.