大跨度桥梁拉索端头的有限元分析  

Finite-Element Analysis of Long Span Bridge Dragline Tip

作　　者：鞠洪海[1] 

机构地区：[1]烟台职业学院,山东烟台264670

出　　处：《煤炭技术》2010年第2期189-192,共4页Coal Technology

摘　　要：应用大型有限元分析软件ANSYS对大跨度桥梁拉索端头进行了基于材料非线性的弹塑性分析,在模型的加载中,第一荷载步所施加的预紧力没有超过材料的屈服强度,第二和第三荷载步所加的预紧力过大,均超过了材料的屈服强度,致使拉杆和螺纹端头进入了塑性状态,原预紧力下降,结构设计失效。如果进入塑性状态的范围过大,则结构将受到破坏,如果不采用弹塑性方法计算,而采用弹性方法计算,则第二和第三荷载步的应力会更大,因此,调整拉杆或拉索的过程最好使用弹塑性方法计算。It is analysed based on material nonlinearity elastic - plasticity of big span bridge tip by large finite - element analysis softwarc（ANSYS）. During loading on model, the pretightening force of the first load - step applied to doesn＇ t exceed yield strength of material, but that the second and the third load - step applied to both exceed yield strength of material, which leads to drag link and thread tip going to plastic stage, the original pretightening force failing and structural design out of work. If the range going to plastic stage is too big, the structure will be damaged; if the calculation method is not an elastic - plastic method but elastic method, the stress of the second and the third load - step will be bigger. Therefore, the elastic - plastic method will be better applied to in the course of adjusting drag link or drag line.

关 键 词：拉索端头 有限元模拟 材料非线性 应力调整 

分 类 号：U445[建筑科学—桥梁与隧道工程]