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In order to study the influence of multiple damage modes on the ultimate bearing capacity of ship beams, the nonlinear finite element method was used to calculate the ultimate bearing capacity of multiple groups of stiffened plates including pitting, fracture and sag damage modes and their combinations. The influence of multiple damage modes on the ultimate strength of the stiffened plate structure under axial compression is obtained, the ultimate strength calculation formula of the damaged stiffened plate is regressed, and the end shrinkage curves of the stiffener elements under the condition of depression, fracture and corrosion damage modes and their different combinations are constructed. The step-by-step iterative approach of the ultimate strength of the combined damaged hull beam under monotonic load is proposed, and the calculation procedures have been prepared. The actual ship calculation shows that the proposed method is simple to calculate, and the error between the proposed method and the ultimate bending moment calculation result of the finite element method is within 10%, which can be applied to the evaluation of the ultimate strength of old ships.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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