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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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