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In order to obtain the load-bearing characteristics of large diameter bolt under typical connection structure, ground test research on the basis of finite element analysis is carried out, which obtains the axial force and additional bending moment of large diameter bolt and revealsits failure mechanism. Analysis and test show that the additional bending moment is an important factor affecting the load-bearing capacity of large diameter bolts. After considering the additional bending moment, the equivalent axial force is several times of the initial axial force, which must be paid attention to in the design work. The formula for calculating the strength of large diameter bolt considering the influence of additional bending moment is proposed, which improves the accuracy. In addition, the method of reducing the additional bending moment of large diameter bolt is studied, and the direction of structural optimization is pointed out.
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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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