addendum v13 1

Powerful FE technology for specialist applications

Addendum

Version 13.1

FEA LtdForge House, 66 High Street, Kingston upon Thames,

Surrey, KT1 1HN, United Kingdom

Tel: +44 (0)181 541 1999Fax +44 (0)181 549 9399Email: [email protected]://www.lusas.com

Distributors Worldwide

Product Customisation

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Table of ContentsLUSAS Modeller Customisation 1

Product Customisation ....................................................................................................... 1The Bridge and Civil menu.................................................................................................. 1Grillage Wizard .................................................................................................................... 2Vehicle Loads ...................................................................................................................... 4Lane Load Wizard .................................................................................................................................. 4Abnormal Vehicle Load Wizard............................................................................................................. 5Knife Edge Load Wizard........................................................................................................................ 5Autoloader Wizard............................................................................................................... 6Prestress Wizard ................................................................................................................. 7Prestress for Beams ................................................................................................................................ 8Prestress for Plane Stress........................................................................................................................ 8Standard Sections ............................................................................................................... 9Beam Stress Recovery ...................................................................................................... 11The Composite Menu ........................................................................................................ 12Composite Failure Criteria ................................................................................................ 12

LUSAS Modeller Customisation

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Product Customisation

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LUSAS ModellerCustomisationThis addendum covers additions to the documentation required for version 13.1 for allLUSAS software products.

Product CustomisationAfter running LUSAS Modeller, a product specific menu entry will added to the menubar (with the exception of LUSAS Analyst) according to the product key that is in use.

The following menu bar entries will be added for each product:

• Composite - for LUSAS Composite

• Civil - for LUSAS Civil & Structural

• Bridge - for LUSAS Bridge

The Bridge and Civil menuThe LUSAS Bridge menu options will appear as shown:


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The LUSAS Civil & Structural menu options are similar and appear under the menubar name of Civil.

Grillage WizardThe grillage wizard enables LUSASusers to generate two differentskewed bridge deck grillageconfigurations as shown in Figure 1.

Dialogs allow straightforward inputof the data required. The wizardaccounts for multiple spans and alsoapplies support conditions. Groupsare also created to enable geometricand material properties to be easilyassigned.

Grillage Wizard

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Span

Width

Longitudinal Beams Transverse Beams

Skew AngleClockwise +ve

Grillage - Type 2

Span

Width

Longitudinal Beams

Transverse Beams


Grillage - Type 1

Figure 1 - Grillage Types Available from Grillage Wizard


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Vehicle Loads

Lane Load WizardThe Lane Load wizard generates auniform distributed lane load toBS5400 in which the intensity iscalculated as follows:

For lengths over 30m:

• Intensity = 151*(1/L)0.475 KN/m.

For lengths less than 30m:

• Intensity = 9 KN/m.

Once the load is defined by runningthe wizard the HA lane loadingshould be assigned to the model by selecting a point defined at the origin of loadingand dragging the load definition from the Treeview onto the graphics display.

The origin of the load is defined asshown on the accompanyingdiagram:

• 0 - centre

• 1 - bottom left corner

• 2 - left centre

• 3 - top left corner

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Vehicle Loads

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Abnormal Vehicle Load WizardThe abnormal vehicle load wizardgenerates HB vehicle loading toBS5400 for any number of axles.

The intensity of each wheel load =2.5 x the number of HB units (kN).

The origin or the HB vehicle is at thecentre of the vehicle.

As with HA lane loading theabnormal vehicle load should beassigned to the model by selecting apoint defined at the origin of loading and dragging the load definition from theTreeview onto the graphics display.

Abnormal Vehicle Loading Arrangement

Knife Edge Load WizardThe knife edge load wizard generatesknife edge loading to BS5400 wherethe intensity is load/unit width.

The knife edge loading should beassigned to the model by selecting apoint defined at the origin of loadingand dragging the load definition fromthe Treeview onto the graphicsdisplay.

Axle spacing

1m

1m

1m

1.8m 1.8m

Origin


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The origin of the load can be:

• 1 - centre

• 2 - bottom

• 3 - top

Autoloader WizardThe Autoloader Wizard substantiallyspeeds up the creation of the filesrequired to calculate worst caseloading effects.

The use of the Autoloader wizardand the interaction between theWizard, the Autoloader program, andthe LUSAS Modeller and Solver isdescribed fully in the AutoloaderUser Manual.


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Prestress Wizard

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Prestress WizardThe LUSAS Prestressfacility is intended toallow engineers todetermine the stressesin the concrete of pre-stressed structures.

The beam may either bemodelled as a series ofbeam elements or amesh of plane stresselements.

In both cases thelocation of each tendonor group of tendons isdefined by a set ofPoints that are connected by a spline.

The tendon (and in the case of prestress for beams, the lines representing the beam)must be selected prior to selecting the prestress wizard.

The prestress wizard takes account of the effect of losses due to the following effects:

• Friction and Wobble (Tendon profile losses)

• Draw-in

• Elastic shortening (as % loss in pre-stress force)

• Shrinkage of the concrete (as % loss in pre-stress force)

• Relaxation of the steel (as % loss in pre-stress force)

• Concrete creep (as % loss in pre-stress force)

The prestress wizard computes the equivalent forces due to the prestress cable inaccordance with BS5400 . The prestress forces are transferred to the beam or planestress elements automatically. After load assignment the forces may be visualised ifrequired.

Using this simplified force approach, the effects of prestress can be defined in aseparate linear loadcase which can be combined with the other load cases to computethe overall structural behaviour.


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Prestress for BeamsThe line defining the tendon should be defined as a spline passing through a set ofuser-defined points, ensuring sufficient points are defined on the cable to adequatelymodel the loading. Use the command Geometry>Line>Spline> Points to do this.

To compute the loading for one tendon:

• Select the line defining the tendon

• Select all of lines that define the concrete beam

• Select the Prestress wizard command

The prestress dialog will appear.

• Select the Analysis type and define the prestress parameters.

• Click the Apply button.

The wizard will compute the prestress loading and apply it to the beam. To enable theloading to be visualised the line should be meshed with the appropriate engineeringbeam elements (BEAM, GRIL or BMS3). Geometric and concrete properties shouldbe assigned and support conditions added in the normal way.

Notes. The sequence must be completed for each tendon in the model. Currently thebeam must lie in the XZ or XY plane with the cable eccentricity orthogonal to thebeam

Prestress for Plane StressThe line defining the tendon should be defined as a spline passing through a set ofuser-defined points, ensuring sufficient points are defined on the cable to adequatelymodel the loading. Use the command Geometry>Line>Spline> Points to do this.

2. Select all Linesrepresenting the beam

1. Select the Spline representing the tendon

3. Select the Prestress Wizard

Civil (or Bridge)Prestress Wizard

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Standard Sections

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To compute the loading for one tendon:

• Select the line defining the tendon

• Select the Prestress wizard command

The prestress dialog will appear.

• Select the Analysis type and define the prestress parameters.

• Click the Apply button.

The wizard will compute the prestress loading and apply it to the plane stress elementswhich should be assigned appropriate geometric and material properties.

Standard Sections

Within LUSAS Modeller a library of standard BS sections has been added. These canbe selected from the Standard Sections dialog.

1. Select the Spline representing the tendon

2. Select the Prestress Wizard

Civil (or Bridge)Prestress Wizard


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Steel Section Types available are:

• Universal Beams

• Universal Columns

• Joists

• Circular Hollow Sections

• Square Hollow Sections

• Rectangular Hollow Sections

• Channels

• Equal Angles

• Unequal Angles

• Castellated Universal Beams

• Castellated Universal Columns

• Castellated Joists

• Tees from Universal Beams

• Tees from Universal Columns

The user should select the local axes for the member based on the analysis type. Thesection may be turned through 90 degrees to reverse the Major and Minor axes. Sheardeformation may neglected by selecting the “Exclude Shear Deformation” option.This multiplies the shear area by 103. Once selected the user should add the chosensection properties to the Treeview using the Apply button. The section is thenavailable for assigning to the appropriate line members.

Beam Stress Recovery

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Beam Stress RecoveryBeam stress recovery has been madeavailable using the user definableresults utility.

To use this facility the results filemust be loaded on top of the modelfile. The user is required to input thebeam section modulus of eachmember type. These are assigned tothe appropriate line elements fromwhich the beam stresses arecomputed. As well as the sectionmoduli the yield stress may be input to enable the utilisation factor to be computed.

Results may be printed or displayed using the standard facilities or printed from thebridge/civil menu using the print options provided. A typical set of output results isshown.


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The Composite Menu

Composite Failure CriteriaComposite failure recovery has beenmade available using the userdefinable results utility.

To use this facility the user musthave the results file loaded on top ofthe model file. The user is required toinput the composite strength data.These are assigned to the appropriatesurface elements from which thecomposite failure criteria arecomputed.

The composite failure criteria available are:

• Tsai Hill

• Hoffman

• Tsai Wu

• Hashin Fibre

• Hashin Matrix

Results may be printed or displayed using the standard facilities or printed from thecomposite menu using the print options provided.

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