Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

384 Chapter Thirteen
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curve BC. Let the horizontal distance from the y axis to a point P be x
and let the distance down from the x axis be y.
For x = 0, y = 0
2
For x = l/10, y = R – R −( l
2 /100)
2
For x = 2l/10, y = R – R −( l
2 /25)
The sign of x can be plus or minus without changing the value of y.
Thus, the curve is symmetrical about the y axis. Table 13-1 gives the
equations for determining y for different values of x.
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Value of x Value of y
0 0
l
10 R − R
2
2
l
−
100
2l
10
3l
10
4l
10
5l
10
6l
10
7l
10
8l
10
9l
10
R −
R −
R −
R −
R −
R −
R −
R −
R
R
R
R
R
R
R
R
2
2
2
2
2
2
2
2
2
l
−
25
9l
−
2
100
4l
−
2
25
2
l
−
4
9l
−
2
25
49l
−
2
100
16l
−
2
25
81l
−
2
100
10 R − R − l
10
2 2
TABLE 13-1 Value of x and y for
Construction Centering for Thin-Shell
Roof (See Figure 13-1)
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