Research Article
Dynamic Characters of Stiffened Composite Conoidal Shell Roofs with Cutouts: Design Aids and Selection Guidelines
Table 5
Clamping options for 0/90/0/90 conoidal shells with central cutouts having
ratio 0.2.
| Number of sides to be clamped | Clamped edges | Improvement of frequencies with respect to point supported shells | Marks indicating the efficiencies of number of restraints |
| 0 | Corner point supported | ā | 0 |
|
0 | Simply supported no edges clamped (SSSS) | Good improvement | 35 |
| 1 | (a) Higher parabolic edge along (SSCS) | Marked improvement | 46 | (b) Lower parabolic edge along (CSSS) | Marked improvement | 49 |
(c) One straight edge along (SSSC) | Marked improvement | 52 |
| 2 | (a) Two alternate edges including the higher and lower parabolic edges and (CSCS) | Marked improvement | 57 | (b) 2 straight edges along and (SCSC) | Remarkable improvement | 88 | (c) Any two edges except for the above option (CSSC, CCSS) | Marked improvement | 63 |
| 3 | 3 edges including the two parabolic edges (CSCC, CCCS) | Marked improvement | 45 | 3 edges excluding the higher parabolic edge along (CCSC) | Remarkable improvement | 96 |
| 4 | All sides (CCCC) | Frequency attains the highest value | 100 |
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