Question

A 150 foot long footing has 3 ea. #5 reinforcing bars continuous the length of the footing. The bars are 20 foot long each and the design requires a 30 bar diameter lap splice at each splice. If #5 reinforcing weighs 1.04 pounds per linear foot and has a bar diameter of 5/8 inch, how many tons of rebar are in the footing? (Note: 1 ton = 2,000 pounds) Disregard concrete cover.

Answer 1

Hi,

Solution as follows:

1. Lap Length Calculation:

Bar Diameter = 5/8 inch

Lap Length as per design = 30 time diameter

Lap Length in inches = 5/8 x 30 = 18.75 inch

Lap Length in feet = 18.75/12 = 1.56 feet

2. Effective length of each bar:

Total Length of one Rebar = 20 ft

Lap Length = 1.56 ft

Effective length = 20 – 1.56 = 18.44 ft

3. Required Number of Bars and laps:

Hence the required number of bars in single run would be 9. 8 bars will be of full length and one bar will be short length. Accordingly number of laps in single run would be 8.

4. Rebar Schedule:

Rebar schedule of footings is given below:

TABLE 1: REBAR QUANTITY OF FOOTING
Sl. No.	Particulars	Bar No.	Bar spacing (ft)	Spacing Distance (ft)	Each Bar Length (ft.)	No. of Bars	Unit Wt (lbs per ft.)	Total Weight (lbs)
1	Continuous bar	#5			150.00	3	1.040	468.00
2	Overlap	#5			1.56	24	1.040	38.94
		Total weight in pounds						506.94
		Since 1 ton = 2000 pounds, rebar weight in ton						0.253

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