Modular Supports System Product Technical Guide June 2026

Modular Support Systems Technical Guide, Edition 2

3.0 Modular Support System

3.2.4 MT Splice Connectors

MT-ES-70 OC

Description

Extension splice connector for coupling MT-70 or MT-80 girders end-to-end. Meant to be installed with the thread forming bolt.

Material Specifications

Standard 1 Grade 1 F y, ksi( MPa) F u, ksi( MPa)

GB / T 1591 Q355 B 51.49( 355) 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.

Corrosion Protection

Description	Environmental Conditions
MT-ES-70 OC	Outdoor, low to moderate pollution( C3 / C4- low)

mm( in)

Figure 86 – MT Splice Connection Table 274- Allowable Strength Design( ASD) Load Data 1, 2, 3

A. MT-70

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)
10,180( 45.30)	1,100( 4.90)	1,795( 8.00)
1 Minimum Safety Factor, Ω, for tabulated values is 2.05.
2 Multiply tabulated values by 1.5 to obtain minimum Load and
Resistance Factor Design( LRFD) values.
3 See Figure 86.

Table 275- Limit State Design( LSD) Load Data 1, 2

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)
13,240( 58.90)	1,435( 6.40)	2,335( 10.40)
1 Maximum Resistance Factor, φ, for tabulated values is 0.75.
2 See Figure 86.

Figure 87 – MT Splice Connection

Table 276- Allowable Strength Design( ASD) Load Data 1, 2, 3

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)	My ft lb( kN m)
20,360( 90.60)	2,200( 9.80)	3,595( 16.00)	3,340( 4.53)
1 Minimum Safety Factor, Ω, for tabulated values is 2.3.
2 Multiply tabulated values by 1.5 to obtain minimum LRFD values.
3 See Figure 87.

Table 277- Limit State Design( LSD) Load Data 1, 2

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)	My ft lb( kN m)
26,480( 117.80)	2,875( 12.80)	4,675( 20.80)	4,340( 5.89)
1 Maximum Resistance Factor, φ, for tabulated values is 0.6.
2 See Figure 87.

A. MT-80( long side)

Modular Supports System Product Technical Guide June 2026 | Page 135