Modular Support Systems Technical Guide, Edition 1
3.0 MODULAR SUPPORT SYSTEM 3.2.2 MT BASE CONNECTORS MT-B-GS T OC
Description
Base connector for anchoring MT-70 and MT-80 girder structures to concrete and steel( X-BT / S-BT / F-BT compatible).
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
Hot-Dipped Galvanized( HDG)
MT-B-GS T OC
Ordering Information
Description
Weight Per Piece lbs( kg)
Quantity Piece( s)
Item No. MT-B-GS T OC 4.78( 2.17) 2 2272100
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Figure 13- MT Girder Anchoring to Concrete
Table 83- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4
F x lb( kN)
F y lb( kN)
F z lb( kN)
M y lb ft( kN m)
4,950 |
2,695 |
3,615 |
815 |
( 22.03) |
( 12.00) |
( 16.1) |
( 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 13.
Table 84- Limit State Design( LSD) Load Data 1, 2, 3
A. MT-70 / 80
Figure 14- MT Girder-to-Girder Connection
F x lb( kN)
F y lb( kN)
F z lb( kN)
M y lb ft( kN m)
7,025 |
3,525 |
5,125 |
1,230 |
( 31.27) |
( 15.70) |
( 22.80) |
( 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 13.
Table 85- Allowable Strength Design( ASD) Load Data 1, 2, 3
F x lb( kN)
F y lb( kN)
F z lb( kN)
M y lb ft( kN m)
4,235 |
1,870 |
3,120 |
800 |
( 18.84) |
( 8.32) |
( 13.89) |
( 1.09) |
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. See Figure 14.
Table 86- Limit State Design( LSD) Load Data 1, 2
A. MT-70 / 80 B. MT-90 / 100
F x lb( kN)
F y lb( kN)
F z lb( kN)
M y lb ft( kN m)
6,010 |
2,810 |
4,360 |
1,205 |
( 26.74) |
( 12.51) |
( 19.40) |
( 1.64) |
1. Maximum resistance factor, Φ, for tabulated values is 0.6. 2. See Figure 14.
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