Part 1 - Structural Modeling

8/10/2019 Part 1 - Structural Modeling

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Engineering Dynamics, Inc. Training in Malaysia 2010

Structural Modeling Page - 1

Part 1 Structural Modeling

Section 1 Start the model

In windows file explorer, Create Training Project directory, and create Structural

Modeling subdirectory.

Launch SACS Executive, go to Settings \Executive \Units Settings and set default units toMetric KN Force , and click on OK button. See picture below.

Set current working directory to Structural Modeling and launch Precede program byclicking on Modeler icon in Interactive window of Executive (See picture below).

Click here to launchPrecede


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Select Create New Model and then select Start Structure Definition Wizard (See two pictures below).

Section 2 Define the jack et/pile and conductor model

Define the jack/pile based on the drawing 101

Elevations:Water depth 79.5 mWorking point elevation: 4.0 mPile connecting elevation: 3.0 mMudline elevation, pile stub elevation, and leg extension elevation: -79.5mOther intermediate elevations: -50.0, -21.0, 2.0, 15.3 (cellar deck), 23.0m (main deck)(See picture below)

Click here to create the

new model


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Check Generate Seastate hydrodynamic data to create hydrodynamic data, such as pile and w.boverrides.

Legs

Click on Legs Tab to enter the data for jacket legs.

Number of legs: 4Leg type: UngroutedLeg spacing at working point: X1=15 m, Y1=10 m.Row Labeling: Define the Row label to ma tch the drawingPile/Leg Batter: Row 1 (leg 1 and leg 3, left two legs) is single batter in Y

Row 2 (leg 2 and leg 4, right two legs) is double batter(See picture below for the details of the input)

Conductors:

Click on Conductors Tab and then click-on Add/Edit Conductor Data to enter the data forconductors.

One well bay with four conductorsThe top conductor elevation: 15.3m

Number of conductors in X direction: 2 Number of conductors in Y direction: 2First conductor number: 5The location of first conductor: X= -4.5m, Y= -1.0m (See drawing 102/104)The distance between conductors: 2.0m in X and Y directions.Disconnected elevations: -79.5m, 3.0m and 4.0m.

Click here to define legspacing at the working point.


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(See picture below for the details of the conductor data input)

Click-on Apply to create the leg/p ile and conductor model as shown below.


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Save model

Go to File/Save As, click O.K from prompted window and give file name sacinp.dat_01.

Define properties of leg members

Go to Property/Member Group underPrecede pull down menu. The MemberGroup Manage Window will show up (See

picture on the right).

Undefined Group window shows all groupIDs which are assigned to members, buttheir properties have not been defined. TheIDs will be moved to Defined GroupsWindow after properties are defined.

Click LG1 from Unde fined Groups window and then click-on Add Tab to define the sectionand material properties of LG1 . This group is segmented and the data can be found in Drawing101.

Segment 1: D = 48.5in, T = 1.75in, Fy = 34.50 kN/cm 2, Segment Length = 1.0 mSegment 2: D = 47.0in, T = 1.0in , Fy = 24.80 kN/cm 2 Segment 3: D = 48.5in, T = 1.75in, Fy = 34.50 kN/cm 2, Segment Length = 1.0 mMember is flooded

The unit of each input filed can be modified to use available data. In the pictures below the unitof Outside Diameter and Thickness are changed to English. The segment length will be designedlate. See the pictures below for the details of the LG1 group data input.

Click here to add segment Click here to add the third

Click here after the lastsegment defined to finishgroup LG1


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Repeat above to define LG2 and LG3 group, the data can be found in Drawing 101.

Define group LG4 , DL6 , DL7, CON, PL* and Wishbone groups, find the section dimensionsfrom Drawing 101.

To define those non-segmented groups clickthe group ID from Undefined GroupWindow and then click-on Add Tab; enterthe data and Apply . The picture on the rightshows the LG4 data.

All above groups have section type ofTubular, and both the geometry and materialdata can be defined in Group Managewindow.

Save modelFile/Save As, and nam e the file to sacinp.dat_02.

Member groups defined at this time shall look like the following:-------------------------------------------------------------------------------------------------------------GRUP

GRUP CON 76.200 2.540 20.007.72424.80 9 1.001.00 0.500F7.8490GRUP DL6 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP DL7 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP LG1 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG1 119.38 2.540 20.007.72424.80 1 1.001.00 0.500F7.8490GRUP LG1 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG2 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG2 119.38 2.540 20.007.72424.80 1 1.001.00 0.500F7.8490GRUP LG2 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG3 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG3 119.38 2.540 20.007.72424.80 1 1.001.00 0.500F7.8490GRUP LG3 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.84901.00GRUP LG4 123.19 4.445 20.007.72434.50 1 1.001.00 0.500F7.8490GRUP PL1 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP PL2 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490

GRUP PL3 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP PL4 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP PL5 106.68 3.810 20.007.72424.80 1 1.001.00 0.500 7.8490GRUP W.B 76.200 2.540 20.007.72424.80 9 1.001.00 0.500F7.8490

-------------------------------------------------------------------------------------------------------------

Section 3 Create horizontal framings of the jacket

Open file sacinp.dat_02 or continue from last section.


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To create joint 1100, go toMember/Divide/Ratio from Joint A to getthe dialog box shown on the left.

Click-on Member 103L-104L

Enter 0.5 to Ratio from joint AEnter new joint name 1100Check on Use next availableLeave others blankApply to create the joint

You will be getting a new joint and two new elements, the original member 103L-104L has beenreplaced by two new created members.

Repeat this step to create joint 1101 and 1102.

Step 4 Divide the member by distance

Joint 1103 and 1104 can be defined by using Divide by Distance based on the availabledimensions on Drawing 101.

To create joint 1103, go toMember/Divide/Distance from Joint A to

get the dialog box shown on the left.

Click to select member 101L-103LEnter 11.35m to Length from Joint A

New Joint name should be 1103Keep Use next available name checkedLeave others blank

Joint 1004 can be added same way withdistance = 4.0m.

Step 5 Connect diagonal brace members

Add a member connecting Joint 1101-1100, and define group ID as H12.


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Add the members connecting Joint 1101-1102, 1102-1100, 1104-1100 and 1101-1103, anddefine group ID as H13.

Step 6 Create well head frame members

Joint 1105 and 1106 can be defined by using Divide by Distance based on the availabledimensions on Drawing 101, same as Joint 1103 and 1104.

To create joint 1105, go toMember/Divide/Distance from Joint A toget the dialog box on the left.

Click to select member 1101-1100Enter 11.35m to Length from Joint A

New Joint name should be 1105

Keep Use next available name checkedLeave others blank

Joint 1006 can be added the same way withdistance = 4.0m.

Add member 1104-1106 and 1103-1105, Group ID should be H13

Use Member/Divide/Distance from Joint to create Joint 1107, 1108, 1109 and 1110, anddistances can be found in the drawing; see pictures below for adding Joint 1107 and 1110.

Add Member 1107-1108 and 1109-1110 with Group ID H14.

Step 7 Define member group properties


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Define the group properties to H11, H12, H13 and H14, the dimensions and material can befound in the drawing; the pictures below show the sample of H11 and H12 definition.

Note that the unit of each input can be changed to match available data, following pictures showthe diameter and thickness have been changed to English Unit so the data from the drawing can

be input directly.

Repeat all the steps in Section 3 to create horizontal plans at elevation -50.0m, -21.0m and 2.0m.

All the data and dimensions needed to build the model can be found in Drawings 102 and 103.The joint name and group ID can be found in model plots Plan at EL-50, Plan at EL-20 and Planat EL+2 PDF files.

Section 4 Create conductor guide framing

Use Plan at EL-50.0 as a sample:

Step 1 Create the joints to connect the conductor guide

Divide members 2107-2109, 2108-2110 by ratios to create joints 2111 and 2112;

Add members 2107-2108, 2109-2110, and 2111-2112 and then divide them by ratios to create joint 2113, 2114, and 2115.

Connect members 2113-2115 and 2115-2114.

Step 2 Define member group for conductor guide frame


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Use Property/Member group to define the group property for conductor guide frame. Theconductor and frame connection model is shown in the picture below.

Repeat the steps above to build the conductor connections at elevation -21.0 and 2.0.

Save the file to SACINP.dat_03.

Section 5 Create diagonal members on jacket rows

Step 1:

Open sacinp.dat_03 with Precede, and go to Display/Face and pick Row A .

Step 2

Go to Display/Group Selections to turn off Pile and Wishbone elements from the view.

Step 3:

Turn-on the Joint and Group label by click-on the J and G icon on the toolbar.

Step 4:

Define the X-brace between elevation -79.5m and -50.0m

Go to Member/X-brace to get the dialog boxon the right, and enter the data:


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Center joint name 101XPick four joints 101L, 202L, 201L and 102L(Pick the joints diagonally)Enter BR1 as group ID of though members(The first pair)

Enter BR2 as the group of other membersUse 0.9 as the K factorClick-on Apply

Step 5:

Define the X-brace between elevation -50.0m and -21.0m

Go to Member/X-brace to get the dialog boxon the right, and enter the data:

Center joint name 201XPick four joints 201L, 302L, 301L and 202L(Pick the joints diagonally)Enter BR3 as group ID of though members(The first pair)Enter BR4 as the group of other membersUse 0.9 as the K factorClick-on Apply

Step 6

Repeat Step 5 to build the X-brace between Elevation -21.0m and 2.0m, and the new joint nameshould be 301X; group IDs should be BR5 for through members and BR6 for others.

The locations of center joints 101X, 201X and 301X are automatically calculated by the program.

Step 7


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Repeat Step 1 to Step 6 to build X-braces on Row B, Row 1 and Row 2; use same Group IDs andthe center joint ID starts from 102X on Row B, 103X on Row 1 and 104X on Row 2.

Step 8

Define the group properties for X-brace members. BR1, BR3 and BR5 are through memberswhich are segmented, BR2, BR4 and BR6 are non-segmented members; the dimensions can befound in Drawing 101.

Save model and give a new name sacinp.dat_04.

Section 6 Creating deck frame

Step 1 Cellar Deck (El +15.30m):

Go to File/Structure Definition and click-on Deck Girders Tab

Click-on Add/Edit Deck Girder Data to get following windowDeck elevation: 15.30Deck extension: 4.0m at structure North and South

Step 2 Main deck (El +23.0m)

Deck elevation: 23.00Deck extension: 4.0m at structure North and South, 5.0m at structure East

Check-on here to add thedeck extension beams


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Step 3

Go to Display/Plan and select Plan at 15.3, go to Display/Labeling/Special and turn off Show jacket rows to get larger view; turn on the Joint and Group Label from Toolbar icon.

Step 4

Change the member group ID to W01 and W02 as shown in model plot Plan at 15.3 , go toMember/Details/Modify and select the elements to change.

Step 5

The Member divide feature can be used to simplify modeling. Joint and group names should bedefined as shown in the model plot Plan at 15.3 . The dimensions needed to build the model can

be found in Drawing 202. The functions recommended to build the frame model are:

Member/Divide/Distance from Joint A

Member/Divide/Ratio from Joint AMember Divide/Perpendicular

The new created joints should be named starting from 7100. All the distances and ratios can befound in the drawing. The conductor guide should be connected to the deck using dummymembers same as the ones in the jacket.

Step 6

Check-on here to add thedeck extension beams


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Repeat Step 3 to Step 5 to build the frame in EL 23.00 plan, and the modeling results are shownin the model plot Plan at 23.0 .

Step 7

Define the properties for group W01 and W02; the sections should be selected from the AISC 9th

edition Library.

Above three pictures give the sample of defining W01 (From Left to Right); Repeat it to definethe properties for W02.

Deck member groups defined at this time shall look like the following:-------------------------------------------------------------------------------------------------------------GRUP W01 W24X162 20.007.72424.80 1 1.001.00 7.8490GRUP W02 W24X131 20.007.72424.80 1 1.001.00 7.8490

-------------------------------------------------------------------------------------------------------------

Save the model as sacinp.dat_05

Section 7 Joint connection design

Step 1

Select to include only the jacket in current active window; the deck, piles, conductors andWishbone element to be excluded from the current view.

Go to Display/Group selection and excludegroup PL1-PL5, W01, W02, CON, DL6-DL7 and W.B; check-off show unattached

joints, and then click-on Apply. See picture on the right

Click toselect

Sectionfrom theLibrary

Select wideflange only


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Step 2

Go to Joint > Connection > Automatic Design, choose Offset braces to outside of chord,use Move Brace for Gapping option, Along Chord for Brace Move, set Gap = 5 cm andGap size option to Minimum only, select Use existing offsets if gap criteria is met

In joint Can/Chord options, select Update segmented groups can lengths and set Can lengthoption = API minimum reqts, and select Increase joint can lengths only. See above two

pictures for the detail options to be selected and click-on Apply to create the joint can model.


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Section 8 Define deck beam offsets;

Step 1

Go to Display/Plan and select plan at 15.3m; exclude group W.B and CON from current view.

Step 2

Go to Member > Offsets and drag awindow to pick all members in current view(Selected members will be highlighted tored).

Change Offset Type to Top of Steel.Click-on Apply to create the offsets.

See picture on the right. Note: The deck beam properties mu st bedefined before define the offset using Topof Steel.

Step 3

Repeat above two steps to define the offset for the beams at Plan EL 23.00m.

Save the model to sacinp.dat_06.

Section 9 Define member code check properties

Define Ky/Ly for horizontal framings;

Using Property > K Facto r > Ky to modify Ky factor for H11 members in XY plane Z =-79.50 m and H21 members in XY plane Z = -50.0 m;

Using Property > Effective Length > Ly to modify Ly factor for H32 members in XY plane Z = -21.0 m and H42 members in XY plane Z = 2.0 m;

Section 10 Define deck weight (Area weight)

Step 1 Add cellar deck surface ID (CELLWT1)

Using Weight > Surface Definition , input CELLWT1 for Surface ID, pick up joint71BD, 71ED and 74BD for local coordinate joints, input 0.5 for Tolerance, and pick up 71BD,


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71ED, 74ED and 74BD by holding CTRL key for Boundary joints, select load direction =Local Y , then click Apply to add this surface ID definition.

Step 2 Add ma in deck surface ID (MAINWT1)

Using Weight > Surface Definition , input MAINWT1 for Surface ID, pick up joint81BD, 81FD and 84BD for local coordinate joints, input 0.5 for Tolerance, and pick 81BD,81FD, 84FD and 84BD by holding CTRL key for Boundary joints, select load direction = LocalY, then click Apply to add this surface ID definition.


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Step 3 Add weight group AREA by adding surface weight for deck

Using Weight > Surface Weight , input AREA as Weight Group ID and AREAWT asWeight ID, input weight pressure of 0.5 kN/m 2 for cellar deck and select CELLWT1 for

Included Surface IDs , input weight pressure of 0.75 kN/m2

for main deck and selectMAINWT1 for Included Surface IDs .

Step 4 Add weight group LIVE by adding surface weight

Add weight group LIVE by using surface weight feature. It includes the main deck weight pressure = 5.0 kN/m 2 MAINLIVE and the cellar deck weight pressure = 2.5 kN/m 2 CELLLIVE .


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The added surface IDs and surface weights shall look like following:-------------------------------------------------------------------------------------------------------------SURFID CELLWT1 LY 71BD 71ED 74BD 0.500SURFDR 71BD 71ED 74ED 74BDSURFID MAINWT1 LY 81BD 81FD 84BD 0.500SURFDR 81BD 81FD 84FD 84BDSURFWTAREA 0.500AREAWT 1.001.001.00CELLWT1SURFWTAREA 0.750AREAWT 1.001.001.00MAINWT1SURFWTLIVE 2.500CELLLIVE 1.001.001.00CELLWT1SURFWTLIVE 5.000MAINLIVE 1.001.001.00MAINWT1

-------------------------------------------------------------------------------------------------

Section 11 Define deck weight (Equipment weight)

Step 1 Define Skid1

Use Weight > Footprint Weight

Weight group ID = EQPT; Footprint ID = SKID1;Weight = 1112.05 kN; Footprint center (5.0, 2.0, 23.0); Relative weight center (0, 0, 3.0)Skid Length = 6 m; Skid Width = 3 m; 2 skid beams in X direction

Click Apply , the summation of forces is shown on a pop-up window. Select Keep to save theinput footprint weight.

Step 2 Define Skid2

Weight group ID = EQPT; Footprint ID = SKID2Weight = 667.23 kN; Footprint center (-5.0, -7.0, 23.0); Relative weight center (0, 0, 2.5)


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Skid Length = 6 m; Skid Width = 2.5 m; 2 skid beams in X direction

Step 3 Define Skid4

Weight group ID = EQPT; Footprint ID = SKID4Weight = 155.587 kN; Footprint center (10.0, 6.0, 23.0); Relative weight center (0, 0, 4.0)Skid Length = 6 m; Skid Width = 3 m; 3 skid beams in X direction

Step 4 Define Skid3


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Weight group ID = EQPT; Footprint weight ID = SKIDWeight = 444.82 kN; Footprint center (5.0, 0.0, 15.3); Relative weight center (0, 0, 2.0)Skid Length = 6 m; Skid Width = 2.5 m; 2 skid beams in X direction

The added EQPT footprint weights shall looks like following:-------------------------------------------------------------------------------------------------------------

WGTFP EQPT1112.05SKID1 5.000 2.00023.000R 3.0006.0003.000 2

WGTFP2 1.001.001.00.500G WGTFP EQPT667.230SKID2 -5.000-7.00023.000R 2.5006.0002.500 2 WGTFP2 1.001.001.00.500G WGTFP EQPT444.820SKID3 5.000 15.300R 2.0006.0002.500 2 WGTFP2 1.001.001.00.500G WGTFP EQPT155.587SKID4 10.000 6.00023.000R 4.0006.0003.000 3 WGTFP2 1.001.001.00.500G -------------------------------------------------------------------------------------------------------------

Section 12 Define misc weight on the deck and the jacket,

Step 1 Walkway on the deck

Go to Weight/Member weight and hold control key to select all members on the east side of thedecks, and enter the following data:


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Weight group: MISCWeight ID: WalkwayWeight Category: DistributeCoordinate system: GlobalInitial weight value: 2.773 kN/m

Final weight value: 2.773 kN/mLoad dir. factors: Defaults

Click-on Apply and keep the weight.

Step 2 Enter crane weight

Go to Weight/Joint Weightand pick up joint 804L andenter the data:

Weight Group: MISCWeight ID: CRANEWTWeight: 88.964kNLoad dir. Factors: Defaults

Click-on Apply to keepthe weight, see pictures onthe right.

Step 3 Enter the Firewall weight

Go to Weight/Member weight, select the following members: 703L-74BD, 7102-7103, 7106-7107, and then enter the following data:


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Weight Group: MISCWeight ID: FIREWALLWeight Cate: ConcentratedCoord system: GlobalConcen. Weight: 15.0kN

Distance: 1.5mLoad factors: Defaults

Click on Apply to keepthe weight, see pictures onthe right for details.

Step 4 Enter Padeye weight on the jacket

Go to We ight/Joint and pick up joint 501L, 502L, 503L and 504L, and enter the following data:

Weight group: LPAD Weight ID: PADEYE Weight: 2.0kNCheck-on Include

buoyancyDensity: 7.849 T/m^3

Click on Apply to keepthe weight, see pictures onright for details.

Step 5 Enter the walkway weight at boat landing elevation (EL 2.0m)

Go to Weight/Member weight and pick all the members at EL 2.0 plan except the wellbaymembers and then enter the data as following:


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Group ID: WKWY Weight ID: W LKWAY Weight Category: DistributedCoord. System: GlobalInitial weight: 1.5kN/m

Final weight: 1.5kN/mLoad dir. Factors: DefaultsInclude buoyancy& wave load: CheckedDensity: 1.5 T/m^3

Click-on Apply to keep the data, see picture on the right for details.

Step 6 Define Anode weight

Go to Display/Volume s and select Type of volume to Volumes to include. Select joint 101l toget the min. Z-coordinate, select joint 301X to get max. Z-coordinate, and then click Apply. Thiswill make the part of jacket with anode protection in the current view.

Go to Display/Group selection to exclude group PL1-PL5, W.B, CON, H13-H13, H23-H24 andH33-H34; this will exclude the wishbone, conductor, pile, and horizontal elements from thecurrent view.

Go to Weight/Anode Weight, drag a window to select all the members in the current view andenter the data as following:

Weight group ID: ANODWeight ID: AnodeAnode weight: 2.5kN# Anodes: 2/MemberAnode space: EqualInclude Buoyancy: OnDensity: 2.70 T/m^3

Click on Apply to keep the weight, see picture on right for details.

Save the mode to Sacinp.dat_07.

Part of jacket weights shall look like following:-------------------------------------------------------------------------------------------------------------

WGTMEMANOD101L101X 6.003 2.500 1.001.001.00GLOBCONC 2.700ANODE WGTMEMANOD101L101X 12.007 2.500 1.001.001.00GLOBCONC 2.700ANODE


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WGTMEMANOD101L103X 6.673 2.500 1.001.001.00GLOBCONC 2.700ANODE WGTMEMANOD101L103X 13.345 2.500 1.001.001.00GLOBCONC 2.700ANODE

WGTMEMANOD203L303L 9.715 2.500 1.001.001.00GLOBCONC 2.700ANODE WGTMEMANOD203L303L 19.430 2.500 1.001.001.00GLOBCONC 2.700ANODE WGTMEMANOD204L304L 9.763 2.500 1.001.001.00GLOBCONC 2.700ANODE WGTMEMANOD204L304L 19.526 2.500 1.001.001.00GLOBCONC 2.700ANODE

WGTMEMWKWY401L4103 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY41034104 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY4104403L 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY403L4100 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY4100404L 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY4102404L 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY402L4102 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY4101402L 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY401L4101 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY41014105 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY41054106 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY WGTMEMWKWY41064100 1.500 1.5001.001.001.00GLOBUNIF 1.500WALKWAY

-------------------------------------------------------------------------------------------------------------

Section 13 Deck Loads

To create inertia loads from various weights defined on deck structure, three steps need to be performed:

Step 1

Define the cener of the acceleration: Go toWeight > Center of Roll, and definecenter ID CEN1 at (0.0, 0.0, 0.0) location.


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ACCEL 1.000000.000000.000000.00000 N CEN1LOADCNMISCINCWGT MISC

ACCEL 1.000000.000000.000000.00000 N CEN1

-------------------------------------------------------------------------------------------------------------

Section 14 Environmental Loading

Step 1 Define drag and mass coefficients

Use Environmental > Global Parameters > D rag/Mass Coefficient to define the data(Shown in the picture).

Cd=0.6 and Cm=1.2 for both clean andfouled members, all the members have sameCd and Cm.

Step 2 Define marine growths

Go to Environment/Global

parameters/Marine growth to enter thedata shown in the picture on the right.

The added marine growth override lines shall look like following:-------------------------------------------------------------------------------------------------------------

MGROV

MGROV 0.000 60.000 2.500 1.400 MGROV 60.000 79.200 5.000 1.400

-------------------------------------------------------------------------------------------------------------


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Step 3 Hydrodynamic modeling

Override the jacket leg members with groupID LG1-LG3 to take into account for theload increase due to the appurtenant

structures like J-tubes and Risers.

The picture on the right indicates that thedrag and mass coefficients have beenfactored by 1.5 to account for the loadincreases.

The hydrodynamic mo del data should look like following:-------------------------------------------------------------------------------------------------------------GRPOVGRPOVAL LG1 1.501.501.501.50 FGRPOVAL LG2 1.501.501.501.50 FGRPOVAL LG3 1.501.501.501.50 FGRPOVAL PL1NN 0.001 0.001 0.001GRPOVAL PL2NN 0.001 0.001 0.001GRPOVAL PL3NN 0.001 0.001 0.001GRPOVAL PL4NN 0.001 0.001 0.001GRPOV W.BNF 0.001 0.001 0.001 0.001 0.001

-------------------------------------------------------------------------------------------------------------

Step 4 Environmental loading

Operating Storm (three directions considered: 0.00, 45.00, 90.00): load case P000 , P045 , P090

Jacket weight groups ANOD and WKWY should be included in all three load cases by using Environment/Loading/Weight/Include Weight Group to account for weight, buoyancy andwave/current loads.Go to Environment/Loading/Seastate to define the wave, current, wind and dead/buoyancy load

parameters. The data can be found in the design specification, and the pictures below show thedetails of load case P000.


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The 3 operating storm load case lines shall look like following:-------------------------------------------------------------------------------------------------------------LOADCNP000INCWGT ANODWKWY

WAVE WAVE1.00STRE 6.10 12.00 0.00 D 20.00 18MS10 1 WIND WIND D 25.720 0.00 AP08

CURRCURR 0.000 0.514 0.000 -5.000BC LNCURR 79.500 1.029DEADDEAD -Z M BMLLOADCNP045INCWGT ANODWKWY


CURRCURR 0.000 0.514 45.000 -5.000BC LNCURR 79.500 1.029 45.000DEADDEAD -Z M BMLLOADCNP090INCWGT ANODWKWY


CURRCURR 0.000 0.514 90.000 -5.000BC LNCURR 79.500 1.029 90.000DEADDEAD -Z M BML

-------------------------------------------------------------------------------------------------------------


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Extreme Storm (three directions considered: 0.00, 45.00, 90.00): load case S000 , S045 and S090

Extreme storm load cases can be defined similar as the operating storm load cases, except 100-year storm criteria are used to generate the environmental forces. The water depth should be

overridden to consider the high tide. The following pictures show the detailed input data from theSpecification.


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The 3 extreme storm load case lines shall look like following:-------------------------------------------------------------------------------------------------------------LOADCNS000INCWGT ANODWKWY

WAVE WAVE1.00STRE 12.19 81.00 15.00 0.00 D 20.00 18MS10 1 WIND WIND D 45.170 0.00 AP08


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CURRCURR 0.000 0.514 0.000 -5.000BC LNCURR 81.000 1.801DEADDEAD -Z 81.000 M BMLLOADCNS045INCWGT ANODWKWY


CURRCURR 0.000 0.514 45.000 -5.000BC LNCURR 81.000 1.801 45.000DEADDEAD -Z 81.000 M BMLLOADCNS090INCWGT ANODWKWY


CURRCURR 0.000 0.514 90.000 -5.000BC LNCURR 81.000 1.801 90.000DEADDEAD -Z 81.000 M BML

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Section 15 Load combination and code check options

Step 1 Load combination

Six load combinations OPR1 , OPR2 , OPR3 , STM1 , STM2 and STM3 will be added into themodel. Three of them are corresponding to operating storms and the other three arecorresponding to extreme storms. Load factor of 1.1 will be used for environmental loads. Thelive load will be included with a factor of 0.75 in extreme storm load combinations.

Go to Load/Combine load conditions to define the load combinations. The following two pictures show the combinations of operating and extreme storm conditions.

The load combination lines shall look like following:


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The LCSEL , UCPART and AMOD lines shall lo ok like following:-------------------------------------------------------------------------------------------------------------LCSEL ST OPR1 OPR2 OPR3 STM1 STM2 STM3UCPART 0.5 0.5 10. 1.0 300.

AMOD AMOD STM1 1.330STM2 1.330STM3 1.330

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Save the model to Sacinp.dat_09

Date post:	02-Jun-2018
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Part 1 - Structural Modeling

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