Learning SAP2000: Analysis Options

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(Last Updated On: April 27, 2016)

Set analysis options ->space frame

Moment releases assigned so no need to analyse as truss.

RUN ANALYSIS

Check out all shear and moment diagrams.

To change moment releases after analysis

Unlock model

Right click->releases-> none

Select-> frame->release partial fixity->none

MODAL ALIVE

Changes are automatically updated, no need to unlock model. Changes can be made without unlocking model.

STEEL DESIGN

Initial -> Analyzed State

Design (menu)->Steel Design->View/revise preferences

Design->Steel Design->Select Design groups->select all groups not ALL->OK

Design->Select Design Combos ->(created load combinations can be added) check automatically generated code-based load combinations

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Displacement Targets

Design->Steel Design->Set Displacements Targets

CTRL+W->Joints-> check labels

Design->Steel Design->Start Design/Check of structures

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Red colur shows FOS>1 and the design has failed.

Design->steel design->Verify all members passed

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Design->steel design->Verify analysis vs design sections

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Analysis must be done again because the analysis sections have changed. So, the forces and moments will also change. Repeat the process again. Repeat until all sections match.

Diagonals are still unsafe after design. The four diagonals are red coloured.

Select unsafe memebers->unlock member->create girder 2 group ISWB (400-600)->assign to girders

If self wt. is not set to 0, BM is created in truss members also.

If no-one section is safe, double channel may also be used.

MAKING DOUBLE CHANNEL FROM SECTION DESIGNER

Double ISMC 300(Back to Back), Clearence =15mm

Define->Section Properties->Frame Sections->Other->Section Designer

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Set appropriate values

Click Design Section

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Right Click Channel-> Change name to ISMC300

The list that was created earlier is shown.

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Select Member->Ctrl+r(Edit->Replicate)

Mirror about y-axis

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Select Member->edit Replicate->Linear->x-axis=-115

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Click Done.

Assign the newly created section to the unsafe members.

Run analysis again. And run design again. And verify all members passed.

This time all pass.

SAP designs linear members only. Does not design slabs.