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Simple Modelling using SACS
February 2, 20124 Comments
Lets begin SACSing! ! !
Using SACS is (somehow) not as hard as it seem. We are going to learn by
directly modeling this basic structure. This tutorial uses SACS-EDI v5.3
The first window shown by SACS 5.3 is what I called theProgram Manager.
Why so? (because i like the name) Seriously, its simply because we have
many options inside this window, from modeling, run analysis, view result,
etc. Three (of many important) parts in this program manager are:
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Program Launcher(located on the very left of the window), where wechoose what we are going to do:
o Modeler, launchPRECEDEwhich we use to model the structureo Data File, launchDATAGENwhich we use to create the model in
text ways, or create run file (e.g. input for seastate analysis, input
for combine file, etc.)o View Results, shows the result in model-view (normally the
extension is psvdb)
o Some more.
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Joint name consists of 4 characters. The program can create the name
automatically, but we can (as always) override the joint name. Input asfollows:
Joint
Name
X Y Z
0001 0 0 0
0002 6 0 0
0003 6 6 0
0004 0 6 0
0005 0 0 6
0006 6 0 6
0007 6 6 6
0008 0 6 6
Let the fixity option blank, we will return to it later.
3.Choose MemberAdd
Member should be labeled with 3 characters. For example B01, which refers
to beam number 1; or B1x, which refers to beam at level 1 and x-
specification (e.g. tubular, I-beam, etc.). There is always the good and the bad
side of these kinds of naming.
+ Structural properties can be
modified one by one (forexample beam in the same
level has different properties)
+ Modeling is simpler, since
we dont define to many beamproperties
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- We must define each ofstructural membersproperties
- If somehow the model shouldbe changed. All thecorresponding structural
members change also.
For this example,
Member
Group
Label
Joint Number
B1I 0005 0006
0006 0007
0007 0008
0008 0005
C1T 0001 0005
0002 0006
0003 0007
0004 0008
You can either enter the joint number one by one, or select the joint directly
in the model.
Ps. To show the number of joint, click the joint symbol on the toolbar toshow joint name.
4.To create brace member, clickjointaddrelative.
Ps. you can either enter the join name manually or let SACS create itautomatically. If the joint name you entered already exists in the model, it
will show warning (theres also an option to select the subsequent number)
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There are 8 bracing (as shown in the figure). Thus, we create 12 new joint (it
has the same distance of 1.5m).
5.Add brace member, clickmemberadd
For this example, name the bracing group label with BR1
6.Add member section, clickpropertymember section
Create wide flange beam with properties as follows:
Width of beam= 20 cm
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Height of beam= 50 cm Flange thickness= 1.6cm Web thickness= 1 cm
Ps. we can also override the properties of our member by defining manually
the axial area, torsional moment of inertia, and moment inertia (strong or
weak axis)but not in this case.
Ps2. we only define the I-member. For the tubular member, we will define itdirectly in the member group (the following).
7.Add member properties, clickpropertymember group
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In Section labelclick , and choose I5020. You can also edit thedimension by clickEdit.
Modulus young (E) of steel is normally 2e5 MPa. Theshear modulus (G) isgiven by :
Where the poissons ratio () of steel is normally 0.3, Thus G would be
76923.08 MPa. We use the yield stress (Fy) of 358 MPa and the density of
7849 kg/m3.
Some other options, (but we dont need them in this tutorial)o Segment, in my opinion is when we have welding connection or segmented
part. For example, we have span of 8 m. Normally the length of member is 6m, so
we could either design 6m and 2m or 4m each. If we use segment, we could
define the length of segment and/or increase the yield strength of the segment(since the weld yielding stress is as great as 458 MPa for E70).
o Flooded memberaffects the hoop force calculation for hollowsection, (e.g. tubular or pipe member), also calculation for
buoyancy forces.
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o Tensile strength is used when we have plastic analysis. Tensilestrength is the same as ultimate strength where the member isfailed (rupture).
For BR1 and I1T, we will enter the member group properties withoutentering the member section properties first. This option not only allows us to
create the model quicker but also the ability to define the member shear area.Member
Group
Outside
Diameter
(cm)
Thickness
(cm)
Yield
Stress
(MPa)
BR1 13.2 1.1 358
I1T 30 2.5 358
By default SACS defines the shear area to be 0.5 (either API or ISO code use
0.5 as shear area coefficient). Though, you can override this value by clicking
miscellaneous.
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Variable load: 1 ton/m2To distribute the loading, we must calculate it manually first. The loads can
be distributed either by envelope method or one-way-slab method. Since we
have the ratio of length and width of 1 (less than 2.5), envelope method isused.
Using standard envelope of 45 angle, we have the center of envelope at(3,3).
Type of
Loading
Area
(m2)
Loading
(tonne/m2)
Total
load
(ton)
Member
Load
(ton/m)
Imposed DL
(Load
Condition
2)
36 1.5 54 2.25
Live Load
(Load
Condition
3)
36 0.75 27 1.125
Variable
Load (Load
Condition
4)
36 1 36 1.5
ClickLoadMember
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Select the corresponding member, and then input the load condition,load ID, load ID filter (optional). The load type we use is force, in
global Z coordinate. Input the corresponding load value (initial andfinal).
To check, whether if we have already define the loading or not, clickLoadDisplay/Modify
9.Add Self-Weight, by clicking LoadSelf Weight
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Input as follows:
Load condition: 1 Load ID: Dead Load direction: -Z Acceleration (G): 1 (its mean 1 gravity or 9.81 m/s2) Load disposition: Add
10. Create load combination.
Based on ISO code, we will create one load combination for dead load, live
load, and variable load. ClickLoadCombine Load Conditions
Load combination: 100 Combination: 1.3 DL + 1.3 IMPS + 1.5 LL + 1.5 VL
11.Dont forget the boundary condition or in this case Joint Fixities.
ClickJointFixities.
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Click joint (using ctrl) 0001000200030004 and choose 111000
(pinned condition).
SACS uses 6 degrees of freedom, and its fix X-Y-Z-Mx-My-Mz.
Voila, the final model
Save your work inside of folder (e.g. Desktop/Training/sacinp.model1)
Running Analysis
Go back to SACSprogram managerand find our last training folder, clickthe folder, hence we are working inside the folder.
Choose Analysis Generator
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Use Static AnalysisBasic with Solve options only. Choose your sacsmodel file and name the output and listing files as your wish.
ClickRun AnalysisTHERE WILL BE ERRORS (LOTS OF)
Why?? Because SACS depends on joint, especially 2 joints for 1 member.
Go back to Filesand use drag and drop method forsacinp.model1
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The problem of our model is a member having more than 2 joint. The columnhas 3 joints, since there is an added point for bracing modeling (Even the
beam has 4 joints :p).
To fix this model, clickMemberDivideExisting Joint. Choose theentire related member that has more than 2 joints for 1 member.
Finish for all the troubling members and save the job. Re-run the analysis by clicking sacmodel1.runx
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This is the end of the tutorial
next we will learn analyzing the results
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4 Responses to Simple Modell ing using SACS
1. Vikas says:March 1, 2012 at 3:38 am
Great !!Simplified the modelling !! Great!!
Reply
o marcieladewasays:March 1, 2012 at 10:03 am
hey, thank you for visiting my blog
unfortunately i havent yet uploading the pictures which are included normally. Iwill get them uploaded as soon as i get a good internet connection
thank you once again.
Reply
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2. Hendi says:March 1, 2012 at 8:21 am
Good Job Bro Keep Posting.. I have Sacs v5.3
I want to learn more.. even not related to my job now wkwkwkw
Input : could you add some picture.. hehehehe
Reply
o marcieladewasays:March 1, 2012 at 10:05 am
thats the spirit
thank you.
ps. i will get the pictures online by this weekend. cross my fingers.
Reply
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