两种不同有限元模型的拉索弯曲性能

Two Different Finite Element Models for Structural Cable Bending Performance

由于拉索内部的力学性能比较复杂,采用有限元方法进行拉索分析。对于钢绞线的有限元模型,目前多采用Solid164单元来进行建模,而对于半平行钢丝束拉索的有限元模型,目前多采用Pipe16单元来进行建模。该模型的特点是由短梁单元和弹簧单元组成。分别采用Pipe16单元和Solid164单元来建立拉索模型,分析了两种有限元模型的弯曲荷载-挠度曲线和拉索的有效弯曲刚度,并与试验数据进行了对比分析。结果表明,对于无预应力条件下,Pipe16单元的模型结果与试验数值误差比Solid164模型的要大;对于有预应力条件下,两种不同的有限元模型结果与试验数据都比较接近,误差很小。因此,采用Solid164单元建立的模型,可以用于对半平行钢丝束的弯曲性能研究。

Since the mechanical properties of the cable are very complex,finite element method is used for cable analysis.For the finite element model of spiral strand cable,Solid164 element is usually used for modeling.For the semi parallel wire cable,finite element model is usually modeled by Pipe16 element,this model is composed of short beam elements and spring elements.Pipe16 element and Solid164 element are used to build the model of cable respectively.The bending load-deflection curves of two kinds of finite element models are analyzed and compared with the experimental data.The results show that the error between Pipe16 model results and experimental data is larger than that of the Solid164 model for unstressed conditions.For pre-stressed conditions,the results of the two different finite element models are comparable to the experimental data and the difference is small.Therefore,the model established by the Solid164 element can be used in the study for the mechanical properties of semi parallel wire cable.