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In ships’voyaging conditions, the global hull girder is subjected to the combination action of cargo loads on ship decks, still water moment and wave moment on hull bottom, and correspondingly partial ship stiffened panels suffer complex loads including longtudinal, transverse forces and pressures. Lateral loads could to some degree influence the ultimate compressive strength in the longitudinal and transverse directions. Thus, it is needed to establish the interaction formulae of ultimate strength for stiffened panels under combined loads. The stiffened panel structures in hull bottom of bulk carrier was selected as the research object. Based on the two-bays-and-two-spans geometrical extent model of stiffened panel with periodic boundary conditions, a nonlinear numerical method was employed to investigate the interaction formulae of ultimate strength for hull girder structures under longitudinal, transverse and lateral loads. It is found that lateral loads always reduce the ultimate strength in longitudinal and transverse directions, meanwhile the larger the lateral loads are, the more the ultimate strength decreases. It is suggested to increase stiffener size and plate thickness for improving the longitudinal and transverse ultimate strength under lateral pressures, respectively. The interaction formulae were developed to assess the ultimate strength of stiffened panels under combined loads and the interaction relationship of ultimate strength under multiple loads. It can be used to perform rapid calculation on the structural strength design under complex combined loads.
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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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