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midas Gen Training SeriesBOUNDARY CONDITION COMPARISON
FOR STEEL BUILDING DESIGN
Angel Francisco Martinez
• Civil Engineer
Inspect Properties
• Material-Steel ASTM A36
-Concrete ASTM Grade C4000
• 9 Sections
Steel Section Concrete
C1 W18x258 0.7 X 0.7 m
C2 W18x211 0.7 X 0.7 m
SG1 W24x76 na
C3 W12x152 0.7 X 0.7 m
C4 W14x159 0.7 X 0.7 m
C5 W18x283 na
SG1 W24x76 na
BR1 W10x60 Na
Boundary Conditions
• Assign fixed all SUPPORTS to bottom nodes (footing)
1. Node/Element > Supports
2. Fix all DOF’s3. Select base nodes
Results: Deformations
• Check Deformations
1. Results > Deformations > Displacements Contours
2. DXYZ under Self Weight Load
Apply Spring Supports
• Assign Constant Soil Springs to bottom nodes (footing)
1. Node/Element > Spring Supports
2. Fix all DOF’s except SDz3. Select base nodes4. Apply SDz 15000 kN/m Spring stiffness
Results: Settlement
• Run Analysis, Check Deformations
1. Results > Deformations > Displacements Contours
2. DXYZ under Self Weight Load
Export to GTS NX
1. Export Building in MXT File to GTS NX2. Export Reactions DZ Nodal Results to GTS NX for FIXED BC
New Option inGen 2017v3.1
Spring Stiffness Calculation
1. Import Structurefrom Gen for node location info
2. Import Ground CAD Geometry
New Option inGTS NX 2017
Soil Springs from GTS NX
1. 3D Finite Element soil layers2. Import Reactions from Gen file3. Delete Building model
New Option inGTS NX 2017
Extract Results, Export to Excel
1. Settlement Results can be probed into table
2. Copy results into Excel Sheet
New Option inGTS NX 2017
Update Springs in Gen
1. Get Spring Stiffness K from Geotechnical engineer.
2. K = Reactions RZ / settlement DZ3. Update springs in Gen model
Spring Stiffness table
Steel CODE CHECK
1. Run Steel Code Check
2. Select Section 221 and Click Graphic to see detail report
3. Check Results
1. Run Steel Optimal Design
2. Analysis Option > 3 repetitions
3. Select All > Run Design
Steel Optimal Design
1. 1st Design Iteration, 1 section still fail2. 2nd Design iteration, all sections pass3. 3rd iteration was no necessary, no cha
nges in section. Click Graph Report4. Model Update Sections
Steel Optimal Design
SRC CODE CHECK
1. Run SRC Design > Code Check > Column Checking
2. Select Section 69 3. Click Graphic to see detail report
SRC DESIGN
1. Run SRC Design > Optimal Design2. Select 2013. Analysis Option > 3 repetitions4. Design > Update Model