midas Gen Training SeriesBOUNDARY CONDITION COMPARISON

FOR STEEL BUILDING DESIGN

Angel Francisco Martinez

• Civil Engineer

BOUNDARY CONDITION COMPARISON

FOR STEEL BUILDING DESIGN

Dimensions70m

48m

64m

48m

64m

6m

70m

3.8m

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

Perform Analysis

1. Run model with fixedbase

Results: Deformations

• Check Deformations

1. Results > Deformations > Displacements Contours

2. DXYZ under Self Weight Load

Results: Reactions

• Check Vertical Reactions

1. Results > Reactions > FZ

Update File for Soil Springs

1. Save As Soil Springs Constant File2. Delete Fixed Boundary

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

Perform Analysis

1. Run model with updated soil springs

Fixed BC Soil Spring

Result Comparison

Deformation vs Settlement

Steel CODE CHECK

1. Create Load Combinations for Steel Design with Design Code: AISC 14

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

Steel Optimal Design

Results after steel design

SRC CODE CHECK

1. Create Load Combinations for SRC Design with Design Code: SSRC79

SRC Concrete 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

SRC Concrete Design

After SRC Design

Steel Plants

Detail Section Report

Stadium

Beijing National Stadium, China

Airports

Beijing Airport, China

Inchon Airport,

S. Korea

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