THE RATIONAL STRUCTURE OF ANCHOR BLOCK BASED ON FINITE ELEMENT ANALYSIS
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摘要: 锚固块是体外预应力混凝土桥梁的关键构造之一,其结构的合理性对桥梁的疲劳、耐久性、承载能力起着至关重要的作用。对实际桥梁锚固块进行ANSYS分析,将模型按间距0.2 m等分为若干截面,得到各截面横向、竖向、纵向应力分布云图,接着从锚固块的最大应力路径着手,比较各截面应力变化。基于应力变化规律,再分别考虑锚固位置、锚固厚度等方面对锚固块三向应力的影响,最终得到合理的锚固结构构造。其结论对今后相类似的锚固体系设计有一定的参考作用。Abstract: Anchor block is one of the key structure in the externally prestressed concrete bridges, whose rationalityplays a very important role in the bridge fatigue, durability and load capacity. Taking use of the large common finiteelement program ANSYS on the actual bridge anchor block, the model was divided into several sections by the spacing 0. 2 m, by which horizontal, vertical and vertical stress contours in each section were got, then change in the crosssection stress was compared from the maximum stress path in the anchor block. Based on the pattern of the changes ofthe stress, the effect of position and thickness of anchorage on the three-directional stress in the anchor block wasconsidered, at last the reasonable anchorage structure was got, which had some references for the similar design of theanchorage system.
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Key words:
- anchor block /
- finite element analysis /
- stress path /
- reasonable structure
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罗如登.Ansys中混凝土单元Solid65的裂缝间剪力传递系数取值[J].江苏大学学报,2008(2):169-172. [2] 沈殷,李国平,陈艾荣.体外预应力混凝土梁的非线性有限元分析[J].同济大学学报,2003(7):803-807. [3] 江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2004. [4] BSI∶BS 5400.Part 5:Steel,Concrete and Composite Bridges[S].1979. [5] Eurocode 4∶Design of Composite Steel and Concrete Structures[S].Part 2:Bridge.ENVl994-2,2001. [6] Jayas B S,Hosain M U,Behavior of Headed Studs in CompositeBeams:Full Size Test[J].Can J Civ Eng.,1989,16(5):712-724.
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