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GUO Kai-ling(1989-), male, Ph.D., associate professor
ZHU Ling(1962-), male, Ph.D., professor, corresponding author, E-mail: lingzhu@whut.edu.cn.
Outline
Marine structures are frequently subjected to repeated impact loadings, resulting in failure of the structures, even causing serious accidents. The analytical expressions of dimensionless permanent deflection and impact force of a metal beam based on maximal normal yield surface are derived by membrane factor method (MFM), then the results are compared with repeated impact tests. It can be found that the solutions based on MFM are between the upper and lower bounds, and very close to the results of the repeated impact tests, indicating the theoretical model proposed can predict the plastic responses of the metal beam accurately. What’s more, the influences of impact location and boundary condition on the dynamic responses of the beam subjected to repeated impacts are determined. Results show that, as the distance of impact location from the middle span of the beam increases, the permanent deflection decreases, while the impact force increases. Meanwhile, the influences of impact location enhance as the impact number increases. When the permanent deflection is smaller than the thickness, the effect of boundary condition on the plastic responses is significant. However, when the deflection is larger than the thickness, the beam will be like a string and only axial force works, resulting in little influence of boundary condition on the plastic responses of the beam.
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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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