ML20094G977
| ML20094G977 | |
| Person / Time | |
|---|---|
| Site: | 05000605 |
| Issue date: | 02/19/1992 |
| From: | Ehlert G GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20094G975 | List: |
| References | |
| NUDOCS 9203050230 | |
| Download: ML20094G977 (10) | |
Text
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Iladwaste 13uilding Seismic Analysis Prepared by: G.W. Ehlert Dated: February 19,1992 9
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1 :
- 1.0 Introduction i
?. 0 Description of Analytical Model and Analysis Metlind !
t 30 AnalyIical Results i
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1.0 Introduction The radwaste building is of reinforced concrete construction. It has 4 levels, two above grade and two below (see figures 1 through 5). A reinforced concrete frame is used to support dead load and hve loads. Exterior shear walls are used to resist lateralloads hke earth pressure, wind, and seismic loads. That portion of the exterior walls below grade, anel the basemat shall be designed as a category I structure. The portion above grade is nonseismic.
2.0 Description of Analytical Model and Anal3sis Method Since there are no category 1 equipment contained inside the radwaste building, No response spectra are required. The response spectrum method was used to determine the seismic response of the structure. For this analysis Ileg Guide 1.60 llesponse Spectrum normalized to 0.3g for 4% critical dam iing was used as input.
A fixed base analysis neglecting embedment was performet 'I he results are presented in secuan 3.
The radwaste building major structural elements (shear walls and columns) are shown in figures 1 through 5.
The model for the seismic analysis is a simple stick model. One mass point is
, provided for each level of the stucture (see figure 6).
The computed natural frequencies of radwaste building are shown in table 1.
3.0 Analytical Results The verticallorces. shear forces, and overturning moments vs height of the building are shown in table 2.
These results are considered conservative for the waks below grade. Since the actual building lower two floors are restrained by soil. This restraint will reduce the seismic loads on the lower 2 floors compared toit surface founded building.
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Table I itaduaste ilullding Natural Frc<tuencies MODE CYCLES Direction N O. (hr) 1 4 60 X 2 5 57 Y 3 8 94 X 4 10 93 Y 5 11 23 2 6 I? O9 X 7 20 91 Y 8 21 64 Z 9 30.50 X Table 2 SSI'. Selsinic Forces, and Moments Element Axia. X-Shear X-Moment Y-Shear Y-Moment (t) (t) (t-m) (t) (t-m) 1 8.034. 12,924. 227,618- 9 638. 206.142.
2 8.638. 12,760. 161,082. 10.242. 14 d.t'G2.
3 7.222, 11,058. 99,280. 8.604. 77,250.
4 278. 440. 3.074. 344, 2,402.
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