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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