Modular Supports System Product Technical Guide June 2026 | Page 90

Modular Support Systems Technical Guide, Edition 2
3.0 Modular Support System
3.2.2 MT Base Connectors
MT-B-GXL S1 OC
Description
Base plate for fixation of MT-90 / MT 90H / MT-100 girder structures to 3.1”-6.9” steel flange widths( X-BT / S-BT / F-BT compatible). Slotted holes for spatial adjustments.
Material Specifications
Description
Standard
Grade
F y, ksi
( MPa)
MT-B-GXL S1 OC
( GB / T 1591)
( Q355 B)
51.49
( 355)
MT-B-GXL S1 US OC
( ASTM A1011 /
HSLAS-F
ASTM A1018) 1
Grade 50 MOD 1
51.49
( 355)
F u, ksi( MPa) 68.17( 470) 68.17( 470)
1 ASTM A1011 / ASTM A1018 HSLAS Grade 50 MOD is an enhanced version of ASTM A1011 / ASTM A1018 HSLAS Grade 50 with Fu >= 470MPa and Fy >= 355MPa.
Corrosion Protection
Description
Environmental Conditions MT-B-GXL S1 OC Outdoor, low to moderate pollution( C3 / C4- low) MT-B-GXL S1 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-GXL S1 OC
20.72( 9.4)
2
2272106
MT-B-GXL S1 US OC 20.72( 9.4) 2 2487437 mm( in)
Figure 26 – MT Girder Sandwiched to Steel
Table 154- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4, 5
Fx lb( kN)
Fy lb( kN)
Fz lb( kN)
My lb ft( kN m)
Mz lb ft( kN m)
16,795( 74.70)
3,345( 14.9)
3,345( 14.9)
4,835( 6.56)
2,450( 3.32)
1 Minimum safety factor, Ω, for tabulated values is 2.1.
2 Multiply tabulated values by 1.5 to obtain minimum Load and Resistance Factor Design( LRFD) values.
3 Tabulated values require that minimum grade 8.8 threaded rods must be used.
4 Tabulated values are for assembly shown in Figure 26. Design Professional is responsible for checking
strength of supporting steel member.
5 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.
Table 155- Limit State Design( LSD) Load Data 1, 2, 3, 4
A. MT-90 / 90H / 100
Fx lb( kN)
Fy lb( kN)
Fz lb( kN)
My lb ft( kN m)
Mz lb ft( kN m)
25,170( 64.0)
5,035( 22.4)
5,035( 22.4)
6,290( 8.53)
3,670( 4.98)
1 Maximum resistance factor, φ, for tabulated values is 0.7.
2 Tabulated values require that minimum grade 8.8 threaded rods must be used.
3 Tabulated values are for assembly shown in Figure 26. Design Professional is responsible
for checking strength of supporting steel member.
4 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.
Figure 27 – MT Girder Clamped to Steel Table 156- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4
Fx Fy
Fz
lb( kN)
lb( kN)
lb( kN)
lb ft( kN m)
lb ft( kN m)
14,380
1,545
1,545
4,835
2,100
( 109.7)
( 6.88)
( 6.88)
( 6.56)
( 2.85)
1 Minimum safety factor, Ω, for tabulated values is 2.3.
2 Multiply tabulated values by 1.5 to obtain minimum LRFD values.
3 Tabulated values are for assembly shown in Figure 27. Design Professional is responsible for checking
strength of supporting steel member.
4 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.
Table 157- Limit State Design( LSD) Load Data 1, 2, 3
Fx lb( kN)
Fy lb( kN)
Fz lb( kN)
My lb ft( kN m)
Mz lb ft( kN m)
21,580( 96.0)
2,315( 10.3)
2,315( 10.3)
6,290( 8.53)
3,145( 4.27)
1 Maximum resistance factor, φ, for tabulated values is 0.65.
2 Tabulated values are for assembly shown in Figure 27. Design Professional is responsible for checking
strength of supporting steel member.
3 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.
My Mz
89