B5 GeniE Deck With Detailed Joint

DET NORSKE VERITAS1

SESAM Frame deck with joint details

DNV Software Genie Deck Detail WorkshopRevised 12 March 2011

Modelling in GeniE

SESAM User Course in Advanced Topside ModellingGenie Workshop:

Topside with one joint detailed modelled with plate elements The purpose of this workshop is to create a global model initially and make one joint

detailed. The focus is primarily on making the structure and not the loads nor detailed mesh control.

There are 4 loadcases covering selfweight, various equipments and a combination of all. It is assumed that the user is familiar with regular structure modelling (beams and flat

plates using snap to point modelling techniques). There are no need for detailed knowledge on GeniEs user interface; this workshop

explains in detail how to make the model The workshop is also accompanied with input files for GeniE (Journal file)

You need to make mesh and run analysis to see results This workshop should be viewed on-line or on colour print out to best see the property

colour coding. All pictures have been created using paper background Default viewing settings have been modified

The structural data as well as the loads are fictitious This tutorial has been revised with GeniE version D5.3-07 (March 2011) it may be that

you need this or a later version to complete this workshop

Part 0 - General

DET NORSKE VERITAS2



Modelling in GeniE

Part 0 General introduction to the workshopPages 1-2

Part 1 Design premiseDefine the units, material and section typesPages 5-9

Part 2 Guiding geometryDefine the guiding geometry needed to define the cellar deck. The main deck will be made as a copy of the cellar deck and the frames in between is defined by referencing the cellar and main deckPages 10-11

Part 3 The cellar deckModel the beams interactively. You will se the symbols to the right that represent start and stop of beams during modelling. The material MAT1 and HE600A are used as default settingsNotice that the symbol for right mouse bottom click is different from left mouse bottom clickPages 12 - 14

Part 4 The main deckThe main deck is a copy of the cellar deck and the profiles are changed from section HE600A to HE400APages 15 17

Part 5 The columnsInsert the columns in between the cellar and main deck and make these segmented beams including the different section properties and transition zone (a cone) between a larger and smaller diameter Pages 18 22

Part 6 The deck rowsComplete one row in XZ plane (including offsets) and copy to other positions to make Row_1 > 6. The same approach is used to make Row_A -> E in YZ plane. This part finalises the frame modelling part by making a named set called Topside_completePages 23 26

Part 7 The loadsMake one equipment simulating the flare tower. The loads from the flare is controlled so that they act on a selected deck members (there are no specific footprints to this equipment). The other equipment represents a helideck the loads in this case is controlled by using footprints on the equipment. In addition, the loading condition includes self weight of the structure. Pages 27 37

Part 0 - General

Click start of beam

1

Click end of beam

2

Use right mouse button to activate the context sensitive menu

3

DET NORSKE VERITAS 3



Modelling in GeniE

Part 8 Boundary conditionsAdd boundary conditions at bottom of each columnPages 38 -38

Part 9 Run beam analysisDo analysis and learn how to find analysis results. This part also shows a typical example on how to visualize some results (bending moments)Pages 39 - 40

Part 10 Save frame analysisLearn how to save a model journal file with and without historyPages 41 - 41

Part 11 Start making detailed modelObjectives of the detailed shell modelPages 42 - 42

Part 12 Shell columnMake the column a shell model and connect properly to the beam modelPages 43 - 49

Part 13 Shell webMake the web a shell modelPages 50 - 52

Part 14 Shell flangeMake the flange a shell model and connect properly to the beam model Pages 53 - 59

Part 15 Adjust the meshLearn some of the alternatives for controlling and refining the mesh Pages 60 - 61

Part 16 Run combined analysisPerform a linear static analysis and learn how to change element types Pages 62 - 65

Part 0 - General

DET NORSKE VERITAS4



Modelling in GeniE

Define units meters and KN Start the program and open a new workspace File|New Workspace. Specify name

Deck_tutorial and change databse units to meters and KN, remember to tick Set database units. Click OK when done

Define materials Use the command Edit|Properties and select Material. Select Create/Edit Material to

give the details for MAT1 (remember to tick Allow edit). Click OK when done

Part 1 Design premise

DET NORSKE VERITAS5



Modelling in GeniE

Define section properties Section profiles HE400A and HE600A found from section libraries. Use the command Edit|Properties and select Section. Select Create/Edit section to

start defining the sections. Select Section Library

Find the right section library from Browse and select the library NSF_EN.KZY (a Norwegian standard library)





Modelling in GeniE

You may find the profiles HE400A and HE600A by searching the section list, but the quickest way is to use the filter for section type in this case I-profiles.

The sections are now selected by clicking on HE400A and then RMB+click on HE600A

Click OK and the profiles are now part of the design premise

Click create/edit sectiondefine the pipe sections


DET NORSKE VERITAS7



Modelling in GeniE

Define the pipe properties P_brace, P_leg_norm_15, P_leg_norm_35 and P_leg_large_35 as shown below. You may use mixed units as shown





Modelling in GeniE

The material and section properties may now be accessed from the browser. Since the modelling will start with the cellar deck, the section profile HE600A should be set as default Right click on HE600A and select set default. Notice also the default symbol that will appear.





Modelling in GeniE

Specify the mesh settings for automatic mesh creation as follows: Edit|Rules|Meshing The indicated tick-off marks are additions to the default settings


DET NORSKE VERITAS10



Modelling in GeniE

Insert a guiding plane from the command Insert|Guiding Geometry|Guide Plane Dialog and enter the values as shown.

Give z-value 4 m, number of spacings 5 in each direction and tick absolute values before entering the values for the spacings. The co-ordinate values for corner points are now automatically defined

Part 2 Guiding geometry




Modelling in GeniE

Using the view settings Default displayyou see the guide plane

If you cant see the guideplane, click Fit to screen button

View the guide plane from above before start modelling the beams of the cellar deck. Click the tool button View from Z or click F8

Part 2 Guiding geometry




Modelling in GeniE

You activate beam modelling modus by clicking at the beam symbol as shown below By doing so, the program sets itself into a modelling mode versus selecting mode

The beams are now defined by clicking at the reference points found on the guiding plane for the cellar deck

The below picture shows the definition of 5 beams (the beams are selected for better visibility)

Part 3 Cellar deck

Click start of beam

1

Click start of beamClick start of beam

1

Click end of beam

2

Click end of beamClick end of beam

2

Click start of beam3


Click end of beam

4

Click end of beam

44



Click end of beam

6

Click end of beam

66



Click end of beam

8

Click end of beam

88



Click end of beam

10

Click end of beam

1010




Modelling in GeniE

Continue modelling the beams shown below

You can also view the cellar deck from the view setting Modelling Structure and using the Iso-view (F5)

Part 3 Cellar deck




Modelling in GeniE

Make a named set of the cellar deck. Select all members, right click and select Named set.

Part 3 Cellar deck

Release mouse at end of rubberband selection

2

Release mouse at end of rubberband selectionRelease mouse at end of rubberband selection

2

Click and drag start of rubberband selection1Click and drag start of rubberband selection11




Modelling in GeniE

Select all members of the cellar deck and copy upwards 6 meters. The copy command may be activated by right clicking when all the members are

selected

If preview is activated you see the copy position before you accept the copy operation

Part 4 Main deck




Modelling in GeniE

Select all the members of the main deck (for example by viewing from y-direction (F7) and use rubberband select) and make a named set Main_deck.You may choose to view the main deck only from the set browser as shown

All the beams of the main deck is selected and one way of changing section profiles is to do it from the browser

Part 4 Main deck


1


1




Modelling in GeniE

You may verify the section properties from the section profile browser Make sure you see all structure prior to verification go to Utility Set browser,

RMB on one of the sets and select Visible model - show all.

You go back to normal modelling view by closing the colour code view (by clicking the paintbrush as shown

Part 4 Main deck


1




Modelling in GeniE

Change default section profile to P_leg_Normal_15. Note change in symbolfor default settings

Insert one column as follows (the beam is highlighted for better visibility)

Part 5 Columns


1

Click start of beam

1


1

Click end of beam

2


2




Modelling in GeniE

Extend the column length downwards so that it stops at elevation z = 0m, i.e. extend downwards with 4 meters.

Select the beam, RMB, choose Edit Beam|Move End

The column now extends down 4 meters from thecellar deck

The lengths are found by using the dimensioningtool and by clicking between two points

To remove dimensions from graphics click exclamation mark

Part 5 Columns

Click bottom of beam to find end point values

1

Define type of action, in this case along beam

2Add a positive length of 4m since the beam shall be extendedand not reduced

3




Modelling in GeniE

Add the correct section properties to the column beam by making it a segmented member

Double click the column to enter segmented modelling modus

Maximise the window (i.e. focusing the actual beam) by clicking the fit button or F9.

Right click the beam to access the commands for dividing the beam into segments and change section properties by clicking on individual segment, RMB and properties.

Continue the same process until you have specified 4 segments with length 0.5m, 1m, 3.5m and 5m (the latter is automatically calculated)

Beam rotated for visibility purposes You have to remember were the the bottom is, if you get it wrong, the beam

will be upside down.

Part 5 Columns




Modelling in GeniE

Change section types as follows:

Make a section type of Autocone and apply to the transition between large and small column diameters (1.3m and 0.8m)

Edit|Properties|Section|Create/Edit Section Or from section property browser and right click in the browser pane area

Part 5 Columns


1

Select the new section property

2

Apply the action

3




Modelling in GeniE

Change the section type like for the large column diameter part for the transition zone as well as for the middle part of the column such that:

Copy the column to the three other positions by selecting the beam, RMB and select Copy. Find the translation vector by referencing the start and stop position of the translation vector. Finally click OK.

Use the same way to copy to define the two remaining columns

Part 5 Columns

Click start of vector

1Click end of vector

2




Modelling in GeniE

Change default section property to P_brace

Insert beams for one of the rowsby finding start and stop end of the beams

Shown for one beam

Apply eccentricities to the lower part of the diagonal bracings (0.2 m in vertical direction). Select one of the beams, RMB and select Edit Beam|Offset Vector You may want to change to wire frame view to better see the selection of end 1 or

end2

The offset value maybe visualised bylabelling the beam

Part 6 Deck Rows

Click start of beam

1


1

Click end of beam

2


2

Select end of beam

1

Specify the offset vector

2




Modelling in GeniE

Apply the same offset vectors to the three remaining diagonal braces

Select the following beams and make a named set Row_1

Copy the Row_1 set five times to form basis for Row_2 ->6

The program will givea warning that it willnot copy over existingbeams

Click OK to accept Add vertical members at the

outer part of Row_4 -> 6 andinclude these in the respective sets

The picture below shows Row_ 1 -> 6

Part 6 Deck Rows




Modelling in GeniE

Make the rows in the YZ-plane using thesame modelling techniques as for Row_1 -> 6

Add diagonal bracings for one row Add offset vector at lower end

0.2 m in vertical direction (upwards) Make named set Row_A Copy Row_A and make named sets

Row_B -> E

Row_A shown withoffset vectors onthe lower part of thediagonal bracings

Below is shown rowsRow_A -> E highlighted

Part 6 Deck Rows




Modelling in GeniE

Delete all the diagonal bracings connected to the columns

Add diagonals at the outer deck corner as shown (use section type P_brace) Remember to add eccentricity at bottom of each bracing 0.2 meter upwards

Finally you may want to select all members and create a set Topside_complete

Part 6 Deck Rows




Modelling in GeniE

Make two equipments Flare and Helideck as follows. Use command Insert|Equipment|Prism Shape to generate the equipments

Helideck H = 15m, L = 13m, W = 10, Mass = 50 tonnes. The c.o.g. is in the middle of the equipment. There are 4 footprints in the corner, each with a size 2m x 2 m.

Part 7 The loads

Select footprint template

1




Modelling in GeniE

Flare H = 10m, L = 8m, W = 5, Mass = 24 tonnes. The c.o.g. is located outside the equipment box to simulate the effect of the entire flare. The footprint is the entire equipment bottom.

Make the loadcases LC1 In this case we make the analysis activity first, Activity1 There may be several analysis activities where you can have different load-cases or

combinations 3 basic loadcases will be made to be combined into 1 load combination.

Part 7 The loads

Specify the centre of gravity

1


1

Uncheck this to edit the footprint center offset




Modelling in GeniE

Define load-case LC1

Select the load-case to include self weight of the structure. Forces related to masses (structure, equipments, any point masses) will be computed based on the acceleration field (or gravity which is the default)

Part 7 The loads

Select the activity

1Right click in browser pane area to access the context sensitive menu

2

Select insert loadcase

3


1

Select Properties

2

Tick include selfweight

3




Modelling in GeniE

Rename LC1 to LC_mass

Make the two remaining loadcases to includethe equipments. Use same method as when

defining loadcase LC1, but use names LC_heli and LC_flare. Your browser now looks like

Include equipment Helideck in loadcase LC_heli Set loadcase LC_heli to active Notice the default symbol from the browser

and the identification in the graphic window

Part 7 The loads

RMB1

LMB

2

LMB

3

LMB

2

RMB1




Modelling in GeniE

From the browser select the equipment Helideck and place it to the structure in loadcase LC_heli.

Following action 2 above, move the mouse over to the graphical window (notice the symbol close to the mouse indicating place equipment).

Place the equipment at a reference point as close as possible to the actual position and move it afterwards.

In this case only the named set Main_deck is shown

Part 7 The loads

LMB

2

RMB1

LMB

1




Modelling in GeniE

Move the equipment to correct positionMove 1 meter in negative x-direction (-1, 0, 0)

The footprints are now located overthe desired joint areas

All loads are computed when running analysis or creating ananalysis model (create mesh)

You may verify the loads bymanually computing the loads

Part 7 The loads

LMB

1RMB

2

LMB

2

RMB1




Modelling in GeniE

More details may be found from the loadcase property sheet

Overall details for the loadcase. The applied load is the integral of line loads computed by the program. The conceptual load is the equipment mass multiplied with acceleration

Part 7 The loads

RMB1

LMB

2




Modelling in GeniE

Include equipment Flare loadcase LC_flare Set loadcase LC_flare to current Select the equipment Flare from the browser area

and load it initially to the model as follows (corner of main deck structure shown).

Move equipment 1.5 meters in negativex-direction (select equipment, RMB, Move)

Part 7 The loads




Modelling in GeniE

Rotate the equipment to intersect with Row_1 Select equipment, RMB, Move, Rotate The rotation point and vector is derived from the model by selecting the point

and clicking start and end position of the vector Notice the preview

Move the equipment 3 meters downwards Select equipment, RMB, Move

Part 7 The loads

Select a rotation point

2

LMB

1

LMB and click start and end position of rotation vector(green dots on the figure)

3

Give rotation angle

4




Modelling in GeniE

Direct the load transfer by indicating which beams to receive loads from equipment Flare. Make a load interface and connect this property to both equipment and the actual beams.

Generate the property Flare_loads from Edit|Properties||Load Interface

Apply the property to the beams as follows Select the beams, find the load interface from the browser and apply to

selected beams

Apply the load interface property to equipment Flare using same method

Part 7 The loads




Modelling in GeniE

Generate and verify the applied loads using same method as for loadcaseLC_heli.

Notice that the force couples inhorizontal directions are computed

Make the loadcombination where the loadcases are weighted with different scaling factors as shown below

From analysis browser define the loadcombination LC_total Double-click a loadcase to define the loadfactor

Part 7 The loads




Modelling in GeniE

Apply two pinned and two fixed conditions as bottom of columns Notice: If you want this model to be part of a superelement hierarchy you specify

supernodes in stead Insert four support points by activating the support tool button and clicking at the 4

positions. Then select two of the supports, RMB, Properties and change rotational degrees of

freedom to Free

Part 8 Boundary conditions

LMB

1

LMB

2

LMB

3

LMB

4

LMB

5




Modelling in GeniE

Run the analysis from Tools|Analysis|Activity Monitor (or by using the shortcut ALT+D) There are several ways of verifying analysis details. The example below shows how

to open the listing file from the analysis done by Sestra

It is not the objective of this tutorial to do results presentation, but the results are accessed as follows or from using short-cut ALT+P (in this case the bending moment diagram is shown for the whole structure using load combination LC_total)

Part 9 Run beam analysis




Modelling in GeniE

If you have problems to see results,Remember to click fit to view button andrefresh button

Or to set use this presentation as default.




Modelling in GeniE

Save the model for backup-purposes. By saving the model (which is recommended from time to time) you save a journal

file that can be used to generate a new model. This file contains all activities you have performed i.e. it contains a history log also. For large models and many modifications this file can become long.

Save by File|Save This will create a journal file with the same name as your workspace e.g . In this case the name will be Deck_tutorial.js.

Import in new model by File|Read Command File You may save a compressed file neglecting the history log. This file is ideal for

back-up purposes and easy recreation of you model. Save the compressed journal file from File|Export|Genie journal file (JS) and

call it Deck_tutorial_clean.js. The start of the clean file is shown below. This file will be used later when creating the detailed joint model

Exit the program from File|Exit

Part 10 Save frame model




Modelling in GeniE

Make new workspace and call it Deck_joint_tutorial and read in the clean journal file save in Part 10.

File|New Workspace File|Read Command File

Goal: To make a shell model of one joint and connect to the frame model at the ends of the highlighted beams.

Split the relevant beams Select relevant beams and divide them

Divide the relevant beams in two equal parts Select a beam, RMB, Divide and

use parameter 0.5

Part 11 Start making detailed model




Modelling in GeniE

Insert guide points at each connection Insert|Guiding Geometry|Guiding Point Change to wireframe view

for better visibility

Delete the beams These beams will be modelled with shell

elements Change back to outline view

Insert a guide plane at the bottom of the column (i.e. at Point1)

Specify the radius of larger and smaller column diameters (0.65m and 0.4m)

Move the guideplane and connect P1 to Point1

Part 12 Shell column




Modelling in GeniE

Insert guide circles to be used when making the circular column

Insert|GuidingGeometry|GuideArc Elliptic

Copy the guide circle with R=0.65m to where conical transition starts (up 0.5m)

Move the guide circle with R=0.4m to where conical transition stops (up 1.5 m)

Copy the guide circle with R=0.4m to top of shell column (up 7.5m)

Define plate thickness for column Edit|Properties|Thickness Pl_35

with thickness 35mm Set the thickness to default


Define origin

1

Define start of circle

2

Define end of circle

3




Modelling in GeniE

Define lower part of column by using skin curve modelling Insert|Plate|Skin Curves or by clicking the tool button

Define conical part of column using same technique


Define next line of surface

2

Define start of surface

1

Define end of surface

3

Define next line of surface

2

Define start of surface

1

Define end of surface

3




Modelling in GeniE

Define upper part of column using same technique

Copy and rotate the quarter part of the column 3 times each 90 degrees to make the complete column

The column shell model is not yetconnected to any of the beams

If you use command Tools|Structure|Verify it will report two disjoint parts





Modelling in GeniE

Connect the top of the shell column to the lower part of the beam column and ensure plane sections remain plane

Use a support rigid link Step 1: Select the independent point

The bottom point of the column beam

Step 2: Decide boundary conditions for independent point

Free in all degrees of freedom, i.e. free to move and rotate

Step 3: Decide dependent region Centre of volume is in the middle of the column (i.e. same as the independent

point) Ensure that all edges of the shell circle is part of region, use dx=1m, dy=1m,

dz=0.2m)

The symbols for the rigid support link looks like:





Modelling in GeniE

Add boundary conditions at bottom Remember to delete the support point connected to the bottom of the previous

column beam Select the guiding circle at bottom of column, RMB and select Create Support

Curve

Select the support curve and copy it with rotation90 degrees 3 times using Point1 as rotation point

Look at the finite element mesh at this stage Define an initial mesh density of 0.5 meters and apply to the plates

Edit|Properties|Mesh Property and give 0.5 m Apply Md_test to the plates





Modelling in GeniE

Click Alt+M to generate a test mesh and look at the mesh from the view Mesh All Blue colour is beam finite elements Green colour is shell finite elements





Modelling in GeniE

Create the webs as plate elements by using guiding lines as references Define Guiding Lines between end of the HEA600 beam to centre of column

(Curve5) and copy it twice The copy vector is the length from HEA600 centre symmetry line to mid of

flange - 0.2825m

Create the remaining guiding lines for the 3 other webs

Define the thickness for the web; Pl_13 = 13mm and set it to default

Part 13 Shell web




Modelling in GeniE

Define the plates by using Insert|Plate|Flat Plate Dialogue Notice the plates connect inside the column

Use same technique to model remaining three web plates

Part 13 Shell web

Point3

3

Point4

4

Point1

1

Point2

2




Modelling in GeniE

Click Alt+M to generate a test mesh and look at the mesh from the view Mesh All Remember to connect the mesh property Md_test to the new web plates

The plated web is not yet properly connected to the beams this will be done when the plated flanges are created using rigid support link

Part 13 Shell web




Modelling in GeniE

When making the shell flanges a top down modelling approach is used. This means making a large plate that is cut afterwards. It is also possible to do a bottom up approach by making small pieces and joining the them

Make the large plate by defining outer boundaries (copy guide lines) and inserting a regular plate.

Remember to make the flange thickness Pl_25 = 25mm and set it to default

Make guideplanes that will be used for creating the cut sections so that flangesincluding brackets are defined.

Part 14 Shell flange

P1

1

P1

2P2

3

P2

4

P3

6

P3

5

P4

7

P4

8




Modelling in GeniE

Move the guideplane 1 meter upwards, select it and show only this guideplane Need to move it so that the cut lines generated will punch through the plate

afterwards Change the relative spacings as follows (select the guideplane, RMB and Properties):


Notice: Use relative valueswhen calculating the spacingsIf you use Absolute the valuesfor P1 -> P4 will change




Modelling in GeniE

Make the guiding lines to be used for cutting the plate

Select all guidelines and perform the cut action from Specify vector 0 0 -1.5 to ensure that the punch

vector covers the plate elevation

One quadrant is now completed





Modelling in GeniE

Make a test mesh (Alt+M) Remember to connect Md_test to

the flange plate Mesh seems too coarse Change Md_test to 25mm Make a new mesh

Make the remaining guideplanes the same way I.e the remaining three quadrants

Change spacings





Modelling in GeniE

Change spacings





Modelling in GeniE

Make the cut lines and perform the punch operation to make the upper flange plate complete.

Copy the flange plate down to lower end of web

Make a test mesh (Alt+M)





Modelling in GeniE

Connect the ends of the plated HE600A to beam HE600A using rigid support links. See explanation on page 46

Use the highlighted points as independent points Use other values for dependent regions


dx=0.2

dy=1

dz=1

dx=1

dy=0.2

dz=1




Modelling in GeniE

Make a test mesh and look at the plate elements There are certain parts that is not meshed Change Md_test to 0.2m and make

new mesh. The mesh is improved, and

you may adjust even finer

You may want to ensure a straight mesh line at the end of brackets. Insert feature edges to ensure lines.

Before inserting feature edges click on tool buttonto see the feature edges.

Use command Insert|Feature edge to insert 8 feature edges shown below

Make a new mesh

More manual control is now built into the mesh and you may change the Md-test to a coarser value if you want, the picture shows Md_test = 0.5m

In the following 0.2 is used

Part 15 Adjust the mesh




Modelling in GeniE

You may test out other ways of refining and controlling the mesh Feature edges Split plates and assign more local control Mesh options example below shows using quadratic mesh and assign this

property to the web plates

Part 15 Adjust the mesh




Modelling in GeniE

Start the analysis from Alt+D There are warnings that you

might want to check out If you open up the analysis

listing file you see thatthere are warped elements

You may look at stresses (in this case VonMises) from Alt+P

Part 16 Run combined analysis




Modelling in GeniE

Change element types to higher order and re-run analysis

Edit|Rules|Meshing No warped elements occur

The new VonMises stresses are As can be seen the max stress increases with more than 35%





Modelling in GeniE

Make a new mesh option an apply to the flanges From browser Properties -> Mesh Option RMB Make a mesh option Flange and ensure that

Advancing Front Quad mesher is used Apply to flanges and brackets

This results in a better mesh in the brackets and a different result distribution (vonMisesshown)





Modelling in GeniE

Modify the mesh density Md_test to 0.075m and re-run analysis (not part of input file on GeniE help)

You may set the mesh density smaller to refine the model

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B5 GeniE Deck With Detailed Joint