| 摘要: |
| 本文指出:由于塑料大棚的钢拱架采取冷弯成形工艺,从而一方面使拱架在承受载荷之前就具有自应力;另一方面使拱架材料的屈服极限发生变化,最后导致强度发生严重的畸形:负弯矩处过份安全,正弯矩处强度则严重不足。这一畸形必须设法克服。 |
| 关键词: 拱形塑料大棚,冷弯成形,应力畸形 |
| DOI： |
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| An Urgent Problem to be Solved in Design Strength of Arched Frame Plastic Tent |
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Zhang Zikai
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| Abstract: |
| This paper points out that since the cold-bending technology is adopted in Working the arched steel frame of plastic tent,on the one hand,arched frame has been made to have its own stress before its being subject to load,on the other,the limit of yielding of materials of arched frame has changed,eventually leading to the occurence of serious strength malformation;thus,there is much allowable strength in the negative bend,being over safe,but there is serious shortage of allowable strength in the positive bend.Hence,this malformation must be overcome. |
| Key words: arched frame plastic tent,cold bending technology,strength malformation |
