Modular Supports System Product Technical Guide June 2026 | Page 30

Modular Support Systems Technical Guide, Edition 2
3.0 Modular Support System
3.1.1 Cross-Section Properties of MT Profiles
Table 9- Cross-Section Properties of MT Girder Profiles 1, 2, 3, 4, 5
Description Symbol Units MT-70 MT-80 MT-90 MT-90H MT-100
Profile of cross-section--
Design thickness Width- Depth- Weight Minimum specified yield strength
Modulus of Elasticity Gross Section Properties 2 Gross cross-sectional area
Moment of inertia of the gross section about x- axis Moment of inertia of the gross section about y- axis
Gross section-modulus about x-axis
Gross section-modulus about y-axis
Radius of gyration of the gross section about x- axis Radius of gyration of the gross section about y- axis Effective Section Properties
Effective moment of inertia about x-axis
Effective moment of inertia about y-axis
Effective section modulus about X axis at stress = Fy Effective section modulus about Y axis at stress = Fy Allowable bending moment based on local buckling about x-axis( Ωb = 1.67) Allowable bending moment based on local buckling about y-axis( Ωb = 1.67) Allowable bending moment for distortional buckling about x-axis based on kΦ = 0( Ωb = 1.67) Allowable bending moment for distortional buckling about y-axis based on kΦ = 0( Ωb = 1.67)
Allowable shear about x-axis( Ωv = 1.6)
Allowable shear about y-axis( Ωv = 1.6) Torsional Section Properties 2 St. Venant Torsional Constant
Torsional warping constant t
w
Fy
E
Ag
Ix
Iy
Sx
Sy
rx
ry
Ix-eff
Iy-eff
Sx-eff
Sy-eff
Ma-x
Ma-y
Mad-x
Mad-y
Va-x
Va-y
J
Cw in( mm) in( mm)
in( mm) lbs / ft( kg / m)
ksi( MPa) ksi( MPa)
in 2( mm 2) in 4( mm 4) in 4( mm 4) in 3( mm 3) in 3( mm 3) in( mm) in( mm)
in 4( mm 4) in 4( mm 4) in 3( mm 3) in 3( mm 3)
k-in( kNm)
k-in( kNm)
k-in( kNm)
k-in( kNm)
lbs( N) lbs( N)
in 4( mm 4) in 6( mm 6) in( mm) in( mm) in( mm)
0.108
0.118
0.118
0.089
0.157
( 2.75)
( 3)
( 3)
( 2.25)
( 4)
1.97
1.97
3.94
3.94
3.94
( 50)
( 50)
( 100)
( 100)
( 100)
1.97
3.94
3.94
3.94
5.91
( 50)
( 100)
( 100)
( 100)
( 150)
2.63
4.43
6.01
6.16
10.0
( 3.914)
( 6.593)
( 8.944)
( 9.17)
( 14.882)
50.75
50.75
50.75
50.75
50.75
( 350)
( 350)
( 350)
( 350)
( 350)
29,500
29,500
29,500
29,500
29,500
( 203,400)
( 203,400)
( 203,400)
( 203,400)
( 203,400)
0.775
1.303
1.768
1.812
2.937
( 500.28)
( 840.82)
( 1140.80)
( 1169.30)
( 1894.80)
0.4382
2.5576
4.2536
3.9526
14.2854
( 182,390)
( 1,064,540)
( 1,770,469)
( 1,645,192)
( 5,946,036)
0.4382
0.8663
4.2536
3.5653
7.654
( 182,390)
( 360,568)
( 1,770,469)
( 1,483,982)
( 3,185,651)
0.4452
1.2993
2.1608
2.0078
4.838
( 7,296)
( 21,291)
( 35,409)
( 32,903)
( 79,280)
0.4452
0.8801
2.1608
1.8111
3.888
( 7,296)
( 14,423)
( 35,409)
( 29,679)
( 63,713)
0.752
1.401
1.551
1.477
2.205
( 19.09)
( 35.58)
( 39.39)
( 37.51)
( 56.02)
0.752
0.815
1.551
1.403
1.614
( 19.09)
( 20.71)
( 39.39)
( 35.63)
( 41)
0.4382
2.3832
3.8584
3.7254
12.0259
( 182,390)
( 991,957)
( 1,605,985)
( 1,550,611)
( 5,005,546)
0.4382
0.6451
3.8584
3.2861
6.4751
( 182,390)
( 268,521)
( 1,605,985)
( 1,367,793)
( 2,695,127)
0.4452
1.2107
1.9601
1.8924
4.0728
( 7,296)
( 19,839)
( 32,120)
( 31,011)
( 66,741)
0.4452
0.6555
1.9601
1.6705
3.2894
( 7,296)
( 10,741)
( 32,120)
( 27,374)
( 53,903)
15.137
41.759
61.75
64.48
134.73
( 1.710)
( 4.718)
( 6.977)
( 7.258)
( 15.222)
15.137
21.008
61.75
52.24
101.91
( 1.710)
( 2.374)
( 6.977)
( 5.902)
( 11.514)
------ N / A--
------ N / A--
6,329
6,727
15,579
7,760
19,828
( 28,132)
( 29,902)
( 69,249)
( 34,519)
( 88,135)
6,329
12,723
15,579
8,910
31,631
( 28,132)
( 56,554)
( 69,249)
( 39,634)
( 140,600)
0.7146
2.1217
6.6870
2.7256
15.8713
( 297,456)
( 883,107)
( 2,783,333)
( 1,134,474)
( 6,606,148)
0.00015
0.1693
0.0023
2.1380
1.2794
( 39,434)
( 45,468,000)
( 610,560)
( 574,110,000)
( 343,560,000)
Distance from the centroid to the shear center along the principal x-axis
X0
0
0
0
0
0
Distance from the centroid to the shear center along the principal y-axis
Y0
0
0
0
0
0
Net polar radius of gyration about the shear center
r0
1.063
( 27.00)
1.621
( 41.17)
2.193
( 55.71)
2.037
( 51.73)
2.733
( 69.42)
Coefficient for determining critical elastic lateral-torsional buckling stress
β
-
1
1
1
1
1
1. Tabulated values are in accordance with ICC-ESR 5019 and AISI-S100-16, the North American Specification for the Design of Cold-Formed Steel Structural Members.
2. Tabulated gross properties, including torsional properties, are based on the full unreduced cross section of the profiles, away from the punched holes and slots.
3. For deflection calculations, use the effective moment of inertia.
4. Allowable moment is the lesser of Ma and Mad.
5. C. G. is the center of gravity of the profile cross-section.
29