From the Main Menu,
select Tools > Tools > Ground Response Analysis > Model > Ground Acceleration Function
Add Acceleration
Define a new acceleration
data function.
Modify/Show
Check and modify previously
defined data.
Delete
Delete data.
Function
Name
Select the Time History
Analysis condition entered in the time history analysis Function. Click
the Seismic Wave button to define the function if not previously defined.
Time
Function Data Type
Normalized
Acceleration
Only the values obtained
through Time History Acceleration Spectrum divided by the gravitational
acceleration can be used.
Scaling
Specify a multiplier
for the Ground Acceleration function.
Scale
Factor
A scale factor to increase/decrease
the acceleration.
Maximum
Value
The spectrum data is
modified such that the maximum acceleration is set by the Maximum Value.
Gravity
Display the applied
acceleration of gravity.
Graph
Options
Specify whether or not
to produce the graph in a log scale along each axis.
Description
Enter the brief description
of the Ground Acceleration function. The default shows the peak acceleration
and duration used in ground acceleration generation.
Generate
Earthquake Response Spectrum
Calculate the seismic
response spectrum and display it in a graph either by using the seismic
wave data of the built-in earthquake record or by user-defined values.
Input the damping ratio. If a number of graphs
corresponding to a multiple number of damping ratios need to be simultaneously
generated, click the
button. Input the range of periods and the interval
for generating graphs at the result stage.
Select the spectrum
type. Check on to generate graphs in a log scale along each axis.
Note:The program supports the following 3 entry
methods
1.
Saving a frequently used time history load into a file and importing the
file.
Use
the method to import previously created Time History Load data. The data
are saved with a '*.sgs' or '*.thd' extension and written in the following
formats:
*SGSw
File is in "Seismic Data Generator" data format, which is
the SoilWorks module that auto-extracts seismic data.
*TITLE, Elcentro 1940, N-S Component
-
*X-AXIS, Second
-
*Y-AXIS, Normalized Acceleration
-
*UNIT&TYPE, GRAV, ACCEL
-
*FLAGS, 0, 0
-
*DATA
-
1.00000E-010, 3.50102E-001
-
5.00000E-002, 3.82861E-001
-
IN
-
1.50000E-001, 5.17459E-001
-
:
-
<fn.sgs file format>
Optional
**Comments &endash; can be entered anywhere.
-
*UNIT, M , N - Length: MM, CM, M, INCH, FEET, GRAV possible
-
*Load: KG, TON, KN, LBF, KIP
-
*TYPE, ACCEL - ACCEL, FORCE, MOMENT possible
Mandatory
*Data
-
X1 , Y1 (X: Period, Y: Time Function)
-
X2 , Y2
-
X3 , Y3
-
:
<fn.thd file format>
2. Accessing the built-in Time
History Load data in SoilWorks.
Use
the feature to create Time History Loads by importing various seismic
data from database.
3. Directly defining in the dialog box of Add
Ground Acceleration Function/Modify/Show
Directly
define Time and the corresponding Time History Loads in the table.
button. Input the range of periods and the interval
for generating graphs at the result stage. 