不同膜面张力下索膜间摩擦接触对谷索拉力的静力影响分析

Friction contact effect static analysis between cable and membrane on valley cable forces with variable membrane initial pre-tensions

对带有一条稳定索(谷索)的双曲张拉索-膜结构,应用ANSYS软件进行算例分析,谷索与膜面之间的摩擦接触问题用接触单元Contact175来模拟,接触表面的摩擦作用仅用摩擦系数来考虑,膜面初始预张力分别取2,3,4kN/m,对模型进行初始形态分析和静力荷载分析。分析表明,摩擦接触对谷索实际拉力的影响与膜面初始预张力、荷载形式及荷载大小均有关。相同膜面初始预张力下,外荷载较大时,共享节点的谷索拉力最小,考虑摩擦接触的谷索拉力分析才是偏于安全的。

The model is a tensioned cable-membrane structure which has a stable cable（valley cable）,and all analyses were completed by finite element program ANSYS.The friction contact between the valley cable and membrane surface was simulated by unit Contact 175 in ANSYS,and the effect of friction contact surface was considered by the introduction of friction coefficients.For form-finding analysis and static loading analysis,three different membrane initial pre-tensions were selected.Analysis show that fricional contact influeces on valley cable force are relevant to membrane initial pre-tension,load form and load values.Compared with valley cable force considering frictional contact,valley cable force of sharing nodes is the smallest.So frictional contact should be considered in some cases for security.