Modular Supports System Product Technical Guide June 2026 | Page 86

Modular Support Systems Technical Guide, Edition 2
3.0 Modular Support System
3.2.2 MT Base Connectors
MT-B-GS T OC
Description
Baseplate for attaching MT-70 or MT-80 girder to concrete or steel( X- BT / S-BT / F-BT compatible). Can also be used as a connector to other girders. Meant to be installed with the Hilti Thread Forming Bolt.
Material Specifications
Description
Standard
Grade
F y, ksi
( MPa)
MT-B-GS T OC
( GB / T 1591) 1
( Q355 B) 1
51.49
( 355)
MT-B-GS T US OC
( ASTM A1011 /
ASTM A1018) 2
HSLAS-F Grade
50 MOD 2
51.49
( 355)
F u, ksi( MPa) 68.17( 470)
68.17( 470)
1 Mechanical properties of GB / T 1591 Grade Q355 B meet or exceed the mechanical properties of ASTM A1011 SS Grade 50.
2 ASTM A1011 / ASTM A1018 HSLAS Grade 50 MOD is an enhanced version of ASTM A1011 / ASTM A1018 HSLAS Grade 50 with Fu >= 420MPa and Fy >= 350MPa.
Corrosion Protection
Description
Environmental Conditions MT-B-GS T OC Outdoor, low to moderate pollution( C3 / C4- low) MT-B-GS T US OC Outdoor, low to moderate pollution( C3 / C4- low)
Ordering Information
Description
Weight Per Piece, lbs( kg)
Quantity Piece( s)
Item No. MT-B-GS T OC 4.78( 2.17) 2 2272100 MT-B-GS T US OC 4.78( 2.17) 2 2487467
mm( in)
Figure 21 – MT Girder Anchoring to Concrete
Table 144- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4
Fx lb( kN)
Fy lb( kN)
Fz lb( kN)
My lb ft( kN m)
4,955( 22.03)
2,700( 12.00)
3,610( 16.06)
820( 1.11)
1 Minimum safety factor, Ω, for tabulated values is 2.2.
2 Multiply tabulated values by 1.5 to obtain minimum Load and Resistance Factor Design
( LRFD) values.
3 Load values are for base connector only. The design professional is responsible for
checking concrete and fastener strength.
4 See Figure 21.
Table 145- Limit State Design( LSD) Load Data 1, 2, 3
A. MT-70 / 80 Figure 22 – MT Girder-to-Girder Connection
A.
MT-70 / 80
B.
MT-90 / MT 90H / 100
Fx lb( kN)
Fy lb( kN)
Fz lb( kN)
My lb ft( kN m)
7,025( 31.27)
3,525( 15.70)
5,125( 22.80)
1,230( 1.67)
1 Maximum resistance factor, φ, for tabulated values is 0.6.
2 Load values are for base connector only. The design professional is responsible for
checking concrete and fastener strength.
3 See Figure 21.
Table 146- Allowable Strength Design( ASD) Load Data 1, 2, 3
Fx Fy
lb( kN)
lb( kN)
lb( kN)
4,235
1,870
3,120
( 18.84)
( 8.32)
( 13.89)
1 Minimum safety factor, Ω, for tabulated values is 2.2.
2 Multiply tabulated values by 1.5 to obtain minimum LRFD values.
3 See Figure 22.
Table 147- Limit State Design( LSD) Load Data 1, 2
Fz
My lb ft( kN m)
800( 1.09)
Fx
lb( kN)
lb( kN)
lb( kN)
6,010
2,810
4,360
( 26.74)
( 12.51)
( 19.40)
1 Maximum resistance factor, φ, for tabulated values is 0.6.
2 See Figure 22.
Fy Fz
My lb ft( kN m) 1,205( 1.64)
85