veoexrmpzt
Dołączył: 21 Lut 2011
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 Wysłany: Pon 22:28, 04 Kwi 2011 Temat postu: tory burch flats yts kba mmre vkk |
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Large storage stability under external pressure
ucklinganalysisandnonlinearbucklinganalysisinloadcombinationofease2 can be seen from Table 3, non-linear buckling analysis results than the eigenvalue buckling analysis is small, is to strengthen the case Nonlinear Analysis of the ring results than the eigenvalue buckling analysis of a small 27.68%. Shows the critical nonlinear buckling analysis is only about external pressure buckling eigenvalue buckling analysis results about 70% ~ 8O%. 2.3 The instability of initial imperfection on the critical external pressure of the critical initial imperfection on buckling under external pressure of large storage tanks greater impact,[link widoczny dla zalogowanych], 6 (from 75 inches, the soil 19nlill. This section of the nonlinear buckling analysis for the radius of the initial defect protrusions or depressions on the tank without stiffening ring of the critical buckling under external pressure. Table 4 corresponds to the radius and diameter tolerances Tab. 4radiustolerancetothediameters foot radius diameter tolerance range of the value of D inches disabilities O. O. 5 persons 75 ± l ± 1.25 ∞: 2D Liaoning Technical University (Natural Science) Vol 28 with the former method, in accordance with the eigenvalue buckling analysis of the first order imposed by the initial defect mode, the maximum initial imperfection along the radial projection or depression 2.5Iilin to 20min. Figure 2 model without stiffening ring buckling Fig. 2bucklingmodeofthemodelwithoutstiffeningring model of Figure 3 a stiffening ring buckling Fig. 3bucklingmodeofthemodelwithoutstiffeningrings the data in Figure 4, linear regression analysis of the availability curve in Figure 5. Coefficient of determination R is the regression sum of squares of the total sum of squares and the ratio of, which reflects the linear regression line fitting the degree of the range in 【0, l】 between the value closer to 1, indicating that the regression equation The better fit, the value closer to 0, indicating that the worse fitted regression equation. Here, the coefficient of determination R2 = 0.99649, very close to 1,[link widoczny dla zalogowanych], indicating the degree of fitting the regression line is very good, that is the critical buckling under external pressure and the linear relationship between defect size. From the figure shows that each additional 1n scorpionfish defects, the critical buckling under external pressure will reduce the 1.22%. The critical defect size to 19mnl buckling under external pressure to 0.233kPa; eigenvalue buckling analysis is only 69.3%. If the defect size is too large, the critical external pressure will reduce a lot of instability,[link widoczny dla zalogowanych], a large storage tank carrying capacity will be greatly weakened, in order to make the critical buckling instability of the critical external pressure of not less than 70% of the maximum load, so ((API650)) in provides for appropriate manufacturing tolerances. 3 Conclusions (1) Nonlinear Analysis of the results of eigenvalue buckling analysis results than the small eigenvalue buckling analysis only 70% ~ 80%,[link widoczny dla zalogowanych], eigenvalue buckling analysis (linear buckling analysis) can not be used in engineering practice. (2) the critical buckling under external pressure and a linear relationship between defect size. Figure 4 Critical buckling under external pressure and the radius of the relationship between depression defects Fig. 4relationshipbetweencriticalpressureandradiuscaves Figure 5,[link widoczny dla zalogowanych], the radius of the critical buckling under external pressure and depression defect curve fitting Fig. 5curvefiringofrelationshipbetweencriticalpressureandradiuscavesinthetank
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