ANSYS索结构找形及悬链线的模拟

ANSYS Form Finding and Catenary Simulation of Cable Structure

索结构的形态确定是一个非线性大位移问题。由于索结构的形状确定和预应力分布是一对相互影响的参数,因此,其工作阶段的几何状态一般是难以事先确定的,必须通过找形来确定。本文总结出了利用ANSYS对索结构进行找形的步骤,并通过计算实例,验证了ANSYS程序找形计算的准确性。对于比较长的单索,例如斜拉桥、悬索桥、索道等,具有很强的几何非线性,其垂度的影响是不可忽略的。然而,ANSYS软件单元库不包括曲线索单元,利用二节点直杆单元来模拟索单元仅在索长度不太大的情况下满足要求。基于此,本文提出了采用多段link10单元来模拟悬链线索单元。最后通过算例模拟悬链线索单元,验证由多段link10单元模拟悬链线索单元计算方法的可行性和准确性。

How to decide the form of cable structure is the issue of great nonlinear displacement.The form of cable structure and the distribution of pre-stress are both parameters which influence each other,so its working geometrical state is difficult to decide beforehand,the way to make sure is form finding.This paper is about how to use ANSYS for form finding of cable structure and the steps have been concluded,some account cases also been given to verify the accuracy of ANSYS calculation program for form finding.For the long single cable,such as cablestayed bridge,suspension bridge and cableway which have gecometric nonlinearity,its verticality can not be ignore.However,ANSYS element library don＇t include cable element,only when cable isn＇t long can we use link10 to simulate cable.Based on this,this paper proposes a multi-segment link10 unit to simulate the catenary unit.At the end,an account case which used to stimulate catenary is given to verify that it is feasible and accurate enough to use several link10 to stimulate catenary as computational method.