中国科技论文
中國科技論文
중국과기논문
Sciencepaper Online
2014年
5期
611-615,619
,共6页
解恒燕%柴冬冬%郑鑫%葛建锐
解恆燕%柴鼕鼕%鄭鑫%葛建銳
해항연%시동동%정흠%갈건예
圆弧拱塑料大棚%极限承载力%矢跨比%长细比
圓弧拱塑料大棚%極限承載力%矢跨比%長細比
원호공소료대붕%겁한승재력%시과비%장세비
circular arch greenhouse frame%ultimate bearing capacity%rise-span ratio%slenderness ratio
针对单杆型圆弧拱塑料大棚平面内稳定性研究较少的现状，基于有限元平面梁大变形几何非线性屈曲理论，应用 AN-SYS 有限元软件，研究了无边立柱及带边立柱两种形式单杆型圆弧拱塑料大棚骨架承受竖向均布荷载下的几何非线性屈曲性能。研究结果表明：在相同的几何参数条件下，无边柱骨架的极限承载力远高于带边柱骨架，且结构的破坏点集中于1/2跨、1/4跨和底部柱脚处；单杆型圆弧拱塑料大棚结构的极限承载力随着矢跨比的增加而增加；无边立柱骨架合理的矢跨比在0．3左右，带边柱单杆骨架无最优矢跨比；单杆型圆弧拱塑料大棚结构的极限承载力随着长细比的增加而减小；带边立柱单杆圆弧拱塑料大棚结构表现出更强的几何非线性。
針對單桿型圓弧拱塑料大棚平麵內穩定性研究較少的現狀，基于有限元平麵樑大變形幾何非線性屈麯理論，應用 AN-SYS 有限元軟件，研究瞭無邊立柱及帶邊立柱兩種形式單桿型圓弧拱塑料大棚骨架承受豎嚮均佈荷載下的幾何非線性屈麯性能。研究結果錶明：在相同的幾何參數條件下，無邊柱骨架的極限承載力遠高于帶邊柱骨架，且結構的破壞點集中于1/2跨、1/4跨和底部柱腳處；單桿型圓弧拱塑料大棚結構的極限承載力隨著矢跨比的增加而增加；無邊立柱骨架閤理的矢跨比在0．3左右，帶邊柱單桿骨架無最優矢跨比；單桿型圓弧拱塑料大棚結構的極限承載力隨著長細比的增加而減小；帶邊立柱單桿圓弧拱塑料大棚結構錶現齣更彊的幾何非線性。
침대단간형원호공소료대붕평면내은정성연구교소적현상，기우유한원평면량대변형궤하비선성굴곡이론，응용 AN-SYS 유한원연건，연구료무변립주급대변립주량충형식단간형원호공소료대붕골가승수수향균포하재하적궤하비선성굴곡성능。연구결과표명：재상동적궤하삼수조건하，무변주골가적겁한승재력원고우대변주골가，차결구적파배점집중우1/2과、1/4과화저부주각처；단간형원호공소료대붕결구적겁한승재력수착시과비적증가이증가；무변립주골가합리적시과비재0．3좌우，대변주단간골가무최우시과비；단간형원호공소료대붕결구적겁한승재력수착장세비적증가이감소；대변립주단간원호공소료대붕결구표현출경강적궤하비선성。
Given that little research has been done on in-plane stability of single-bar circular arch plastic greenhouse frame,based on the finite element of large beam deformation theory of geometrical nonlinear buckling,two styles of finite element models (ANSYS)for greenhouse frames with and without side columns were established in order to investigate the geometrical nonlinear buckling subjected to vertical uniform load.The results indicate that:under the same geometrical parameters,the ultimate bear-ing capacity of greenhouse frame without side columns is much larger than that of greenhouse frame with side columns.And the failure position occurs at half-span,quarter-span and bottom foot.The variation of ultimate bearing capacity of circular arch plas-tic greenhouse frame with rise-span ratio was analyzed,and then it was found that the ultimate bearing capacity increases with the increase of rise-span ratio.The optimal rise-span ratio of greenhouse frame without side columns is 0.3,and there is no optimal rise to span ratio for the frame with side columns.The variation of ultimate bearing capacity of circular arch plastic greenhouse frame with slenderness ratio was analyzed,and it was found that the ultimate bearing capacity decreases with the increase of rise-span ratio.It suggests that the circular arch plastic greenhouse frame without side columns is much stronger in geometrical non-linearity than the circular arch plastic greenhouse frame with side columns.
