Seismic Data Generator

 

 

 

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 - 8 types

- UBC 88, 94 Dynamic, Uniform Building Code

- UBC 97 Dynamic, Uniform Building Code

- ATC 3-06 Provision, Applied Technology Council

- NBC(1995)

- Newmark & Hall Design Spectrum

- IBC 2000

- Eurocode-8, 1996 (Design)

- Eurocode-8, 1996 (Elastic)

- China (GB50011-2001)

- China Shanghai(DGJ08-9-2003)

- China (JTJ004-89)

- China (GBJ111-87)

- Japan (AIJ, 2000)

- KBC (2005)

- Design response spectra per Structure Design Criteria of the Architectural Institute of Korea (1992, 2000)

- Design response spectrum per Seismic Design Criteria of the Korean Highway Bridges Standards Specifications

 

 

 

From the Main Menu select Tools > Generator > Seismic Data Generator.

Windows Menu : Execute SGS.exe in the midas Civil program folder.

 

 

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.

File

 Open
Open a previously created SGS file.

Close
Close the current working window.

Save
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.

 Print
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 to print.

Print Setup
Setup the printer, printing form and direction.

 

Generate

Earthquake Acceleration Record
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 .

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 to open the data in [.dbs] (sgs dbase file) extension files generated by the user.

 

Earthquake Response Spectra Generation
Generate and plot earthquake response spectra from the earthquake history records built in midas Civil or the seismic data previously created by the user.

 

          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 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 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.

Note
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:

- UBC 88-94 Design Spectrum: Design response spectrum specified in UBC 88~94 Dynamic, Uniform Building Code

- UBC 97 Design Spectrum: Design response spectrum specified in UBC 97 Dynamic, Uniform Building Code

- ATC 3-06 Design Spectrum: Design response spectrum specified in the ATC 3-06 Provision, Applied Technology Council

- Newmark & Hall Design Spectrum: Newmark & Hall Design response spectrum

- KS-Code Design Spectrum: Design response spectrum specified in the Korean Architectural Structures Design Criteria (1986)

- KS-Code 2000 Design: Design response spectrum specified in the Korean Architectural Structures Design Criteria

- KS-Bridge Design Spectrum: Design response spectrum specified in the Seismic Design Criteria of the Korean Highway Bridges Specifications

- IBC 2000 Design response spectrum

- Eurocode-8, 1996 Design response spectrum

- China (GB50011-2001) Design response spectrum

- Japan (AIJ, 2000) 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 to generate the data and plot the graph.

      • Option

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 Grid: Display gridlines in the diagonal direction of the graph.

Line Width: 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.

      • View

From the Main Menu select [View] to display the following detailed menus:

Note
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).