Rev. 6-13-96

THREADED TIE BAR ASSEMBLIES

703-B-053

 

The Standard Specifications are revised as follows:

SECTION 703, LINE 5, INSERT AS FOLLOWS:

the plans or as directed. This work shall also consist of placing threaded tie bar assemblies with the reinforcing steel at the locations as shown on the plans.

SECTION 703, AFTER LINE 98, INSERT AS FOLLOWS:

Threaded tie bar assemblies may be used at the joint between a bridge deck slab and a reinforced concrete bridge approach pavement. The threaded tie bar assemblies may be placed in lieu of the longitudinal 20M x 1800 mm (No. 6 x 6'-0") length reinforcing bars as shown on the plans.

Threaded tie bar assemblies shall be of the minimum splice length and shall achieve the minimum load shown below for the grade of assemblies furnished.

 

MINIMUM SPLICE LENGTH, Millimeters

GRADE
AND
BAR SIZE
MINIMUM
PULLOUT LOAD,
Newtons
SPACING
< 150 mm
SPACING
> 150 mm
    PLAIN
STEEL
EPOXY
COATED
STEEL
PLAIN
STEEL
EPOXY
COATED
STEEL
GRADE 300 STEEL        
10M 30,000 340 520 300 420
15M 60,000 490 730 390 580
20M 90,000 670 1000 540 800
25M 120,000 1110 1670 890 1340
30M 210,000 1560 2330 1250 1860
35M 300,000 2230 3340 1780 2670
GRADE 400 STEEL        
10M 40,000 460 690 370 550
15M 80,000 650 980 520 780
20M 120,000 890 1340 710 1070
25M 200,000 1480 2230 1180 1770
30M 280,000 2080 3120 1660 2500
35M 400,000 2970 4450 2380 3560

 

MINIMUM SPLICE LENGTH, Inches

 

GRADE
AND
BAR SIZE
MINIMUM
PULLOUT,
Pounds
SPACING
< 150 in.
SPACING
> 6 in.
    PLAIN
STEEL
EPOXY
COATED
STEEL
PLAIN
STEEL
EPOXY
COATED
STEEL
GRADE 40 STEEL        
#4 10,000 14 16 12 13
#5 15,500 17 20 14 16
#6 22,000 22 26 18 21
#7 30,000 30 35 24 28
#8 39,500 40 46 32 37
#9 50,000 50 58 40 46
#10 63,500 64 73 51 59
#11 78,000 78 90 62 72
GRADE 60 STEEL        
#4 15,000 21 24 17 19
#5 23,250 26 30 21 24
#6 33,000 33 38 27 31
#7 45,000 45 52 36 42
#8 59,250 59 68 48 55
#9 75,000 75 86 60 69
#10 95,250 95 109 76 88
#11 117,000 117 134 93 107

 

The minimum splice lengths shown above shall be used for reinforcing bars not considered to be top bars. Top reinforcement will be defined as horizontal reinforcement placed such that more than 300 mm (12 in.) of concrete is cast in the member below the bar. Minimum splice lengths for such top bars shall be as shown on the plans.

SECTION 703, AFTER LINE 128, INSERT AS FOLLOWS:

Threaded tie bar assemblies will be measured by the number of assemblies placed.

SECTION 703, AFTER LINE 141, INSERT AS FOLLOWS:

Threaded tie bar assemblies will be paid for at the contract unit price per each, complete in place. If epoxy coated reinforcing steel is specified, such assemblies will be paid for at the contract unit price per each for threaded tie bar assembly, epoxy coated.

SECTION 703, AFTER LINE 147, INSERT AS FOLLOWS:

Threaded Tie Bar Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EACH
Threaded Tie Bar Assembly, Epoxy Coated. . . . . . . . . . . . . . . . . . . . . . . . .EACH

SECTION 703, LINE 153, INSERT AS FOLLOWS:
place, and laps shall be included in the cost of epoxy coated reinforcing steel. If threaded tie bar assemblies are used in lieu of longitudinal 20M x 1800 mm (No. 6 x 6'-0") reinforcing bars, the cost of such assemblies shall be included in the cost of reinforcing steel.