小型灌排U型槽施工期结构受力分析与优化研究
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摘要
渠槽预制构件在施工期破损现象较为普遍,亟需提高构件的结构承载能力.本文以预制U型槽为研究对象,分析构件在实际施工中的受力特征,采用材料力学和有限元法分析构件应力状况;若构件最大拉应力超过混凝土极限弯拉强度,构件会发生脆性破坏,从混凝土材料角度阐释了构件破损机理,同时对构件结构提出了优化建议:增加构件槽底局部厚度或提高混凝土强度等级,实现降低构件承受的最大拉应力、增大混凝土极限弯拉强度的效果,进一步增强构件结构实际的承载能力,有助于提升农田水利工程质量.
Damage of prefabricated canal members is common in construction period, so it is urgent to improve the structural bearing capacity of components. Taking prefabricated U-shaped grooves as the research object, the stress characteristics of components construction period are analyzed, and the stress state of components is analyzed by material mechanics and finite element method. If the maximum tensile stress exceeds the ultimate flexural strength of concrete,brittle failure of components occurs. The damage mechanism of components is explained from the perspective of concrete materials. At the same time,some optimization suggestions are put forward for the structure of components such as increasing the local thickness of groove bottom or increasing concrete strength grade. It's a good way to reduce the maximum tensile stress and increase concrete ultimate flexural strength. The actual bearing capacity of component structure could be further enhanced,which is helpful to improve the quality of farmland water conservancy projects.
Damage of prefabricated canal members is common in construction period, so it is urgent to improve the structural bearing capacity of components. Taking prefabricated U-shaped grooves as the research object, the stress characteristics of components construction period are analyzed, and the stress state of components is analyzed by material mechanics and finite element method. If the maximum tensile stress exceeds the ultimate flexural strength of concrete,brittle failure of components occurs. The damage mechanism of components is explained from the perspective of concrete materials. At the same time,some optimization suggestions are put forward for the structure of components such as increasing the local thickness of groove bottom or increasing concrete strength grade. It's a good way to reduce the maximum tensile stress and increase concrete ultimate flexural strength. The actual bearing capacity of component structure could be further enhanced,which is helpful to improve the quality of farmland water conservancy projects.
引文
[1]王斌. U形渠道衬砌防冻机理与数值模拟研究[D].宁夏大学，2017.
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[3]祝小靓，徐镇凯，傅琼华. U型槽有限元分析[J].江西水利科技，2011,37(04):257~260.
[4]SL191-2008，水工混凝土结构设计规范[S].北京：中国水利水电出版社，2008.
[5]J. M. Raphael. Tensile-strength of concrete[J]. Journal of the American Concrete Institute,1984,81(02):158~165.
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[7]M. A. Rashid,M. A. Mansur,P. Paramasivam. Correlations between mechanical properties of high-strength concrete[J].Journal of Materials in Civil Engineering-ASCE,2002,14(03):230~238.
[8]American Concrete Institute. ACI 318-11 building code requirements for structural concrete and commentary[S].2011.
[9]武明鑫，张楚汉，陈振富.混凝土直拉、劈拉、弯拉强度关系的试验与仿真研究[J].水利学报，2015,46(8):981~988.
[2]戴素娟. U型断面薄壳渡槽应力分析的简化计算方法[J].山东矿业学院学报，1994,13(03):258~263.
[3]祝小靓，徐镇凯，傅琼华. U型槽有限元分析[J].江西水利科技，2011,37(04):257~260.
[4]SL191-2008，水工混凝土结构设计规范[S].北京：中国水利水电出版社，2008.
[5]J. M. Raphael. Tensile-strength of concrete[J]. Journal of the American Concrete Institute,1984,81(02):158~165.
[6]S. Popovics. Strength and related properties of concrete:a quantitative approach[M]. New York:John Wiley&Sons Inc,1998.
[7]M. A. Rashid,M. A. Mansur,P. Paramasivam. Correlations between mechanical properties of high-strength concrete[J].Journal of Materials in Civil Engineering-ASCE,2002,14(03):230~238.
[8]American Concrete Institute. ACI 318-11 building code requirements for structural concrete and commentary[S].2011.
[9]武明鑫，张楚汉，陈振富.混凝土直拉、劈拉、弯拉强度关系的试验与仿真研究[J].水利学报，2015,46(8):981~988.