ML12213A334
| ML12213A334 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/27/2012 |
| From: | Office of Information Services |
| To: | |
| References | |
| FOIA/PA-2012-0121 | |
| Download: ML12213A334 (1) | |
Text
SB-0034.
Calculation C-CSS-099.20-054, Revision 0:
Page 9: At the top of the page, equation y = Max (0, c-h)
Please explain how this is used in the calculation. Given that c is always less than h, the above equation will always return y = 0.
BECHTEL RESPONSE Please refer to Figure 1 below for a graphical explanation of the meaning of y. As can be seen, the variable y is always measured from the location of the neutral axis, which lies outside of the concrete cross section only when the compression force P is very large (i.e., for demands nearing the compressive capacity of the section). Therefore, for a section under the large compression demand shown in figure 1, the internal compressive force C is obtain by integrating the compressive stress between (c-h) and c.
El TC mC.
_Fle~xure... c-_A-----
Compression
- -4 Neutral axis Section Strains Total Strain Figure 1: Strains and demands for a section under large compression demand and moment
/