独塔斜拉桥水滴形钢结构主塔力学特性
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摘要
研究了独塔斜拉桥水滴形钢结构主塔在成桥状态下的力学特性。以安徽涡河三桥为工程实例,通过有限元计算分析,得到了水滴形钢结构主塔的位移及应力分布、三角形隔板及凹槽的局部应力以及主塔中应力最大部位的应力分布等力学规律。研究结果表明:在成桥状态下,主塔的变形以竖向变形为主,其整体变形较小,主塔刚度较大,截面设计合理;主塔的正应力、剪应力均以竖向为主,顺桥向和横桥向均较小,主塔主要处于受压状态;主塔第一主应力较小,第三主应力较大,Mises应力的变化规律与第三主应力较为一致;三角形隔板、凹槽以及主塔应力最大部位的应力值,在材料的容许应力范围内并具有适当的安全储备。
Mechanical behavior of water-drop-shaped steel tower under completion state of bridge was studied.Based on the bridge on Guohe city in Anhui province,finite element method( FEM) was applied to calculate and analyze displacement and stress distribution of steel tower,the local stress of the triangle partitions and grooves,and the stress distribution of the maximum stress section. The results show that vertical deformation of the main tower is the major deformation under completion state of bridge,and the overall deformation is relatively small. The stiffness of the main tower is relatively big,and the section design is reasonable.Furthermore,the normal stress and shearing stress of steel tower are dominated by vertical stress,while longitudinal and lateral stresses are relatively small. The main tower is in the compression situation. The first main stress is relatively small,while the third main stress is relatively big. Variation of Mises-stress is similar with that of the third main stress. Finally,the stress values of the key joints are reasonable,which are in the allowable range of materials and has sufficient safety reserves.
Mechanical behavior of water-drop-shaped steel tower under completion state of bridge was studied.Based on the bridge on Guohe city in Anhui province,finite element method( FEM) was applied to calculate and analyze displacement and stress distribution of steel tower,the local stress of the triangle partitions and grooves,and the stress distribution of the maximum stress section. The results show that vertical deformation of the main tower is the major deformation under completion state of bridge,and the overall deformation is relatively small. The stiffness of the main tower is relatively big,and the section design is reasonable.Furthermore,the normal stress and shearing stress of steel tower are dominated by vertical stress,while longitudinal and lateral stresses are relatively small. The main tower is in the compression situation. The first main stress is relatively small,while the third main stress is relatively big. Variation of Mises-stress is similar with that of the third main stress. Finally,the stress values of the key joints are reasonable,which are in the allowable range of materials and has sufficient safety reserves.
引文
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[2]曾明根,苏庆田,吴冲.上海长江大桥组合索塔锚同区受力数值计算[J].桥梁建设,2007(5):34-37.
[3]卓卫东,房贞政,林清.墩塔梁固结体系斜拉桥固结节点受力分析[J].福州大学学报:自然科学版,1999,27(4):81-85.
[4]庄冬利.宁波外滩大桥—异型独塔斜拉桥设计关键问题研究[D].上海:同济大学,2008.
[5]李艳凤,梁力,王福春.折线塔斜拉桥主塔力学特性的研究[J].东北大学学报:自然科学版,2013,34(9):1361-1364.
[6]魏俊龙.波形钢腹板箱梁斜塔无背索斜拉桥地震响应分析[J].河南科技大学学报:自然科学版,2013,35(3):64-68.
[7]吴万忠,庄冬利,肖汝诚.某大跨异型独塔斜拉桥关键节点空间应力分析[J].石家庄铁道学院学报:自然科学版,2008,21(3):24-28.
[8]龚一琼,郑宪政,汪至刚,等.余姚弯塔斜拉桥结构静力分析[J].城市道桥与防洪,2004(3):33-36.
[9]孙叔禹,谢尉鸿.赣州飞龙鸟大桥斜拉桥设计[J].桥梁建设,2007(3):48-51.
[10]张雷.琴式斜拉桥构思与实践[J].桥梁建设,2004(6):28-30.
[11]李武生,王贵春,陈卫丽,等.大跨度公路斜拉桥车桥耦合振动竖向相应分析[J].郑州大学学报:理学版,2013,45(2):115-120.
[12]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.
[13]中华人民共和国建设部.GB50017—2003钢结构设计规范[S].北京:中国建筑工业出版社,2003.
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