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Project data
Project name
Project number
Author
Description
Date 04-Nov-23
Design code EN

Material
Steel S 355, S 235
Concrete C28

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Project item Center tube connection

Design
Name Center tube connection
Description
Analysis Stress, strain/ simplified loading

Beams and columns

β – Direction γ - Pitch α - Rotation Offset ex Offset ey Offset ez
Name Cross-section Forces in
[°] [°] [°] [mm] [mm] [mm]
B1 10 - BoxFl100x(50/50) 0.0 30.0 0.0 0 0 0 Node
B2 10 - BoxFl100x(50/50) 180.0 0.0 0.0 0 0 0 Node
M3 10 - BoxFl100x(50/50) 90.0 30.0 0.0 0 0 0 Node
M4 10 - BoxFl100x(50/50) -90.0 30.0 0.0 0 0 0 Node
M5 10 - BoxFl100x(50/50) -45.0 30.0 0.0 0 0 0 Node
M6 10 - BoxFl100x(50/50) 45.0 30.0 0.0 0 0 0 Node

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Cross-sections
Name Material
10 - BoxFl100x(50/50) S 235

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Cross-sections
Name Material Drawing

10 - BoxFl100x(50/50) S 235

Load effects (equilibrium not required)

N Vy Vz Mx My Mz
Name Member
[kN] [kN] [kN] [kNm] [kNm] [kNm]
LE1 B1 5.0 0.0 -0.1 0.0 0.6 0.1
M3 2.4 0.0 -0.1 0.0 0.9 0.1
M4 2.4 0.0 -0.1 0.0 0.6 0.1
M5 5.4 0.0 0.0 0.0 0.3 0.0
M6 6.0 0.0 0.0 0.0 0.4 0.0

Check

Summary
Name Value Status
Analysis 100.0% OK
Plates 0.0 < 5.0% OK
Welds 65.7 < 100% OK
Buckling Not calculated

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Plates
Thickness σEd εPl σcEd
Name Loads Status
[mm] [MPa] [%] [MPa]
B1-tfl 1 2.5 LE1 124.2 0.0 0.0 OK
B1-bfl 1 2.5 LE1 102.8 0.0 0.0 OK
B1-w 1 2.5 LE1 125.9 0.0 0.0 OK
B1-w 2 2.5 LE1 214.2 0.0 0.0 OK
B2-tfl 1 2.5 LE1 175.7 0.0 0.0 OK
B2-bfl 1 2.5 LE1 141.8 0.0 0.0 OK
B2-w 1 2.5 LE1 235.0 0.0 0.0 OK
B2-w 2 2.5 LE1 167.4 0.0 0.0 OK
M3-tfl 1 2.5 LE1 137.9 0.0 0.0 OK
M3-bfl 1 2.5 LE1 57.4 0.0 0.0 OK
M3-w 1 2.5 LE1 160.8 0.0 0.0 OK
M3-w 2 2.5 LE1 108.1 0.0 0.0 OK
M4-tfl 1 2.5 LE1 157.3 0.0 0.0 OK
M4-bfl 1 2.5 LE1 41.9 0.0 0.0 OK
M4-w 1 2.5 LE1 132.2 0.0 0.0 OK
M4-w 2 2.5 LE1 90.6 0.0 0.0 OK
M5-tfl 1 2.5 LE1 40.6 0.0 0.0 OK
M5-bfl 1 2.5 LE1 22.2 0.0 0.0 OK
M5-w 1 2.5 LE1 61.9 0.0 0.0 OK
M5-w 2 2.5 LE1 80.0 0.0 0.0 OK
M6-tfl 1 2.5 LE1 98.6 0.0 0.0 OK
M6-bfl 1 2.5 LE1 57.7 0.0 0.0 OK
M6-w 1 2.5 LE1 165.2 0.0 0.0 OK
M6-w 2 2.5 LE1 130.9 0.0 0.0 OK

Design data

fy εlim
Material
[MPa] [%]
S 235 235.0 5.0

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Overall check, LE1

Strain check, LE1

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Welds (Plastic redistribution)

Throat th. Length σw,Ed εPl σ⏊ τ|| τ⏊ Ut Utc
Item Edge Loads Status
[mm] [mm] [MPa] [%] [MPa] [MPa] [MPa] [%] [%]
B1-tfl 1 B2-tfl 1 2.5 50 LE1 OK
B1-bfl 1 B2-bfl 1 2.5 50 LE1 OK
B1-w 1 B2-w 2 2.5 98 LE1 OK
B1-w 2 B2-w 1 2.5 98 LE1 OK
B2-w 1 M3-tfl 1 ◢3.0 36 LE1 204.9 0.0 97.2 -58.5 -86.1 56.9 26.4 OK
B2-w 1 M3-w 2 ◢3.0 88 LE1 140.1 0.0 -75.1 -0.3 68.3 38.9 16.8 OK
B1-w 2 M3-tfl 1 ◢3.0 11 LE1 226.8 0.0 130.9 -31.0 102.3 63.0 63.0 OK
B1-w 2 M3-w 1 ◢3.0 109 LE1 145.4 0.0 -60.4 14.5 -75.0 40.4 16.0 OK
B1-w 1 M4-tfl 1 ◢3.0 11 LE1 41.1 0.0 -10.7 22.6 -3.7 11.4 11.4 OK
B1-w 1 M4-w 2 ◢3.0 109 LE1 160.4 0.0 -65.3 10.5 -83.9 44.6 9.4 OK
B2-w 2 M4-tfl 1 ◢3.0 36 LE1 236.5 0.0 114.4 65.6 -99.9 65.7 30.7 OK
B2-w 2 M4-w 1 ◢2.0 88 LE1 158.6 0.0 9.6 66.3 -63.0 44.1 12.3 OK
B1-w 1 M5-tfl 1 ◢3.0 29 LE1 37.5 0.0 20.9 1.9 17.9 10.4 9.5 OK
B1-w 1 M5-w 2 ◢3.0 109 LE1 107.8 0.0 28.6 -15.4 -58.0 29.9 9.1 OK
M4-w 2 M5-tfl 1 ◢3.0 29 LE1 32.7 0.0 20.8 2.0 14.4 9.1 8.9 OK
M4-w 2 M5-w 1 ◢3.0 109 LE1 46.8 0.0 24.0 19.2 13.0 13.0 4.4 OK
B1-w 2 M6-tfl 1 ◢3.0 29 LE1 127.1 0.0 67.2 24.2 57.4 35.3 25.2 OK
B1-w 2 M6-w 1 ◢3.0 109 LE1 224.6 0.0 -118.9 21.7 -107.9 62.4 19.1 OK
M3-w 1 M6-tfl 1 ◢3.0 29 LE1 67.3 0.0 46.6 0.7 28.0 18.7 17.8 OK
M3-w 1 M6-w 2 ◢3.0 109 LE1 87.6 0.0 -21.7 -0.1 -49.0 24.3 6.8 OK

Design data

βw σw,Rd 0.9 σ
[-] [MPa] [MPa]
S 235 0.80 360.0 259.2

Detailed result for B2-w 2 M4-tfl 1

Weld resistance check (EN 1993-1-8 4.5.3.2)
2
σw,Rd = fu /(βw γM 2 ) =
​ ​ ​ ​
360.0 MPa ≥ σw,Ed = [σ⊥
​ + 3(τ⊥2 + τ∥2 )]0.5 =
​ ​ ​
236.5 MPa

σ⊥,Rd = 0.9fu /γM 2 =

​ ​ ​
259.2 MPa ≥ ∣σ⊥ ∣ =
​
114.4 MPa

where:
fu = 360.0 MPa – Ultimate strength
​

βw = 0.80
​ – appropriate correlation factor taken from Table 4.1

γM 2 = 1.25 ​ – Safety factor

Stress utilization
σ ∣σ⊥ ∣
Ut = max( σw,Ed ; )= 65.7 %
​
​

w,Rd ​
​

σ⊥,Rd ​
​

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Buckling
Buckling analysis was not calculated.

Bill of material

Manufacturing operations
Plates Welds Length
Name Shape Nr. Bolts Nr.
[mm] [mm] [mm]
CUT1 Butt: a = 2.5 296.7
Fillet: a = 3.0 36.2
CUT2
Fillet: a = 3.0 87.9
CUT3 Fillet: a = 3.0 120.3
CUT4 Fillet: a = 3.0 120.3
Fillet: a = 3.0 36.2
CUT5
Fillet: a = 2.0 87.9
Fillet: a = 3.0 29.0
CUT6
Fillet: a = 3.0 109.4
CUT7 Fillet: a = 3.0 138.4
CUT8 Fillet: a = 3.0 138.4
Fillet: a = 3.0 29.0
CUT9
Fillet: a = 3.0 109.4

Welds
Throat thickness Leg size Length
Type Material
[mm] [mm] [mm]
Butt S 235 - - 296.7
Fillet S 235 3.0 4.2 647.6
Fillet S 235 3.0 4.2 306.7
Fillet S 235 2.0 2.8 87.9

Code settings
Item Value Unit Reference
γM0 1.00 - EN 1993-1-1: 6.1
γM1 1.00 - EN 1993-1-1: 6.1
γM2 1.25 - EN 1993-1-1: 6.1
γM3 1.25 - EN 1993-1-8: 2.2
γC 1.50 - EN 1992-1-1: 2.4.2.4
γInst 1.20 - EN 1992-4: Table 4.1
Joint coefficient βj 0.67 - EN 1993-1-8: 6.2.5
Effective area - influence of mesh size 0.10 -
Friction coefficient - concrete 0.25 - EN 1993-1-8
Friction coefficient in slip-resistance 0.30 - EN 1993-1-8 tab 3.7
Limit plastic strain 0.05 - EN 1993-1-5
Weld stress evaluation Plastic redistribution
Detailing No

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Item Value Unit Reference

Distance between bolts [d] 2.20 - EN 1993-1-8: tab 3.3
Distance between bolts and edge [d] 1.20 - EN 1993-1-8: tab 3.3
Concrete breakout resistance check Both EN 1992-4: 7.2.1.4 and 7.2.2.5
Use calculated αb in bearing check. Yes EN 1993-1-8: tab 3.4
Cracked concrete Yes EN 1992-4
Local deformation check No CIDECT DG 1, 3 - 1.1
Local deformation limit 0.03 - CIDECT DG 1, 3 - 1.1
Geometrical nonlinearity (GMNA) Yes Analysis with large deformations for hollow section joints
Braced system No EN 1993-1-8: 5.2.2.5

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