摘要
为了更加准确地模拟索托结构中的索托节点,本文利用ANSYS软件进行整体桁架的模拟并进行相关的有限元分析,提出一种新的索托节点数值模拟方法,即不变刚度短梁法,并与其他3种数值模拟方法(自由度耦合方法、自由度耦合加变刚度弹簧单元方法、点-点接触方法)进行分析对比。结果表明:4种方法对桁架结构挠度和构件内力引起的差别并不明显,结果基本吻合,内力走势一致。由于自由度耦合加变刚度弹簧单元方法已得到验证,故说明本文提出的不变刚度短梁法是合理可行的;自由度耦合加变刚度弹簧单元方法和不变刚度短梁法能更好地模拟索托节点处的摩擦力行为,而且这两种方法理论明确且计算简单方便,是相对较好的索托节点数值模拟方法。
To more accurately simulate cable-supported joints, in this study, we simulated an overall truss by using ANSYS model, and carried out finite element method （ FEM） analyses. As a new method, the constant stiffness short beam method was advanced for simulating cable supported joints. It was also compared with other three meth-ods, the degree-of-freedom coupling method, the degree-of-freedom coupling with variable stiffness spring method, and the joint-joint contact method. The results show that：there are no obvious differences in the deformation and in-ternal forces for the four methods, which are basically same. The trend of the internal forces is consistent. Because the free coupling with variable stiffness spring method has been verified, the proposed constant stiffness short beam method we proved is both reasonable and feasible. The degree-of-freedom coupling with variable stiffness spring method and the constant stiffness short beam method can better simulate the friction forces in cable-supported joints, which represents a better way to model cable-supported nodes, and the theory underlying these two methods is clear and convenient.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2016年第8期1050-1056,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51178041)
中央高校基本科研业务费专项资金项目(2011JBM260)
中国航空规划建设发展有限公司项目(技13研-51)
关键词
索托节点
数值模拟
不变刚度短梁法
自由度耦合
变刚度弹簧
点-点接触
摩擦力
cable-supported joints
numerical simulation
constant stiffness short beam method
degree-of-freedomcoupling method
variable stiffness spring
joint-joint contact method
friction force
