In this development instructional exercise, you will get familiar with the procedure for making the structure and estimation of the volume of concrete or steel for U-shape staircase. Today in this instructional exercise, we give count to an arrangement and section of a u-shape staircase.
The greatest riser of the staircase ought to be 7 inches and least 4 inches. The base tread ought to be 10 inches and most extreme 12 inches or 1 feet. The broadness of the stair ought to be 5 feet. The landing of the stair ought to be at least 10 feet 6 inches. The dividing among two flights ought to be at least 6 inches. The steps in the stair run from 1 to 9. The midsection thickness of the piece ought to be at least 6 inches.
So, total steps along with landing = 10 nos.
With the use of following formula, the volume of concrete will be determined for steps:-
Volume of one step
= 1/2 x riser x tread x length of step
After putting all the values, we get the following:-
1/2 x 0.5 x 0.83 x 5
= 1.03 cubic feet
As there are 9 number of steps in a flight, so the volume of steps for first flight
= 9 x 1.03 = 9.27 cubic feet
Now, it is required to determine the concrete volume for the waist slab. Before that, you have to find out the inclined length of the waist slab by applying the following formula:
(horizontal length)2 + (height)2
But, the horizontal length height is unknown here.
The horizontal length will be computed as follow:-
Horizontal length of waist slab
= Tread x Number of Steps
After putting the values, we get the following:-
0.8333 X 9
= 7.4 feet
Now, it is required to determine the height of the top of the landing from floor as follow:-
Number of riser x Height of riser = 10 x 0.5 = 5 feet
So, inclined length of waist slab = v(horizontal length)2 + (height)2
= v(7.4)2 + (5)2
= 8.93 feet
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Video Source: Civil Engineers