- SGS (Seismic data Generation System) extracts and plots graphs of earthquake history records, seismic response spectrums and design response spectrums using the MIDAS Family Program's built-in earthquake database.
- Built-in earthquake history records - about 30 earthquake records in North America from 1940 until 1990
- Design response spectrums - 7 types
- Design Response Spectrum in accordance with the "Rules on Structural Standards of Buildings (1992)" of the Korean Architectural Association
- Design response spectrum according to the Korean Architectural Association's "Building Load Standards and Explanations (2000)"
- Specification of design response according to seismic design standards of Korea Road Bridge Standard Specification
- ATC 3-06 Provision, Applied Technology Council
- UBC 88,94 Dynamic, Uniform Building Code
- UBC 97 Dynamic, Uniform Building Code
- Newmark & Hall Design Spectrum
From main menu, select [Apps] tab > [Application] group > [Seismic Data] > [Seismic Data Generator]
Print or save all types of data generated in SGS in various formats and open previously generated data.
Extract and plot graphs of earthquake history records, seismic response spectrums and design response spectrums using the earthquake database built-in SGS.
Select all types of options for graphs.
Select to view Toolbar and Status Bar. Zoom Out a zoomed in view. Convert between time domain and frequency domain views.
Open a previously created SGS file.
Close the current working window.
Save the current data in a file. The type of the file to be saved can be selected in [File type]. Possible file extensions are SGS extension for text formats and BMP, JPG and EMF extensions for graphic formats.
Hard-print the graph. The Page Setup dialog box appears as shown below. Printing formats can be controlled by Preview displayed to the right. Click OK to print.
Page Setup dialog box
Setup the printer, printing form and direction.
Open an earthquake history record and plot a graph.
Select Generate > Earthquake Record to display the Earthquake Record Generation dialog box shown below.
Select an earthquake component in the Earthquake field. Enter the scales for the amplitude and time step then click OK.
All the generated data are normalized accelerations in g (acceleration of gravity) and the initial time step is 0.02 sec. Data can also be generated by changing the time step and amplitude of the original data using the amplitude and time scales. When data other than the built-in earthquake history records are to be generated, click Import to open the data in [.dbs] (sgs dbase file) extension files generated by the user.
Earthquake Record generation dialog box
Earthquake Response Spectra
Generate and plot earthquake response spectra from the earthquake history records built in midas Civil or the seismic data previously created by the user.
Earthquake Response Spectra generation dialog box
1. Select an earthquake component in the Earthquake field. Enter the scales of the amplitude and time step. When data other than the build-in earthquake history records are to be generated, click Import to open the data in [.dbs] (SGS dbase file) extension files generated by the user.
2. Enter the damping ratio. When several graphs for different damping ratios are to be simultaneously plotted, click Add to add graphs.
3. Enter the period range and intervals in Output Period.
4. Select the type of spectrum to be generated from Spectrum Type.
- Pseudo Absolute Acceleration : Pseudo Absolute Acceleration Spectrum
- Pseudo Relative Velocity : Pseudo Relative Velocity Spectrum
- Absolute Acceletration : Absolute Acceleration Spectrum
- Relative Velocity : Relative Velocity Spectrum
- Relative Displacement : Relative Displacement Spectrum
- Combined D-V-A(Tripartite) : Combined Displacement-Velocity-Acceleration Spectrum
Check in the x-axis log scale field to generate the period intervals along the x-axis in a log scale.
Design Response Spectra
Generate various design response spectra and plot them in graphs. The detailed menus are as follows:
- KS-Code Design Spectrum : Design Response Spectrum in accordance with the "Rules on Structural Standards, etc. of Buildings (1992)" of the Korean Architectural Association
- KS-Code 2000 Design Spectrum : Design response spectrum according to the Korean Architectural Association's "Building Load Standards and Explanations (2000)"
- KS-Bridge Design Spectrum : A design response spectrum based on seismic design standards in Korea Road Bridge Standard Specification
- UBC 88-94 Design Spectrum : Design response spectrum according to UBC 88-94 Dynamic, Uniform Building Code
- UBC 97 Design Spectrum : Design response spectrum according to UBC 97 Dynamic, Uniform Building Code
- ATC 3-06 Design Spectrum : ATC 3-06 Provision, Design Response Spectrum according to Applied Technology Council
- Newmark & Hall Design Spectrum : Newmark & Hall Design Response Spectrum
Select the detailed menu corresponding to the design response spectrum to be generated to display the following Design Response Spectrum Data Entry dialog box. Enter the data necessary to generate the spectrum and click OK Button to generate the data and plot the graph.
Design Response Spectrum Data Input dialog box
From the Main Menu select [Option] to display the following detailed menus :
Each sub-menu becomes inactivated if it deems inapplicable for the current data type.
X Scale Log : Display the X-axis of the graph in a Log scale.
Y Scale Log : Display the Y-axis of the graph in a Log scale.
X Grid : Display gridlines in the X-direction of the graph.
Y Grid : Display gridlines in the Y-direction of the graph.
Diagonal Gird : 그Display gridlines in the diagonal direction of the graph.
Line Thickness : Adjust the thickness of graph lines. Convert between bold and thin lines.
Unit : Change the units for the generated data.
Edit Graph Title : Change the title for the graph.
From the Main Menu select [View] to display the following detailed menus:
Each sub-menu becomes deactivated when it deems inapplicable for the current data type.
Zoom Out All
When the graph is zoomed in, restore and display the original state. Select the desired part by left-clicking the mouse to zoom window. Right-click the mouse in the graph to restore the magnified part to its original size.
Time ↔ Frequency
When viewing the earthquake history records in a graph, the graph can be converted between the time domain and frequency domain. The frequency domain plot is calculated by FFT (Fast Fourier Transform)