摘要
该文以某大跨越格构式输电塔风致响应为例进行向量式有限元的应用分析,采用C++语言编写杆系结构向量式有限元的计算程序,获得输电塔的响应并与传统有限元结果进行比较,探讨阻尼处理方法和计算步长对计算结果的影响,最后针对输电塔进行风荷载作用下的倒塌分析。研究表明,两种方法算得的位移响应非常接近;向量式有限元法的计算效率比传统有限元高,该文算例中计算时间相差约20倍;计算步长对有限元计算结果有影响,建议计算时进行试算;向量式有限元可以用来求解输电塔的倒塌问题。
The wind-induced response of a long-span lattice transmission tower was taken as an example to illustrate the usage of Vector-Form Intrinsic Finite Element（VFIFE）. A program was written in C＋＋ language to solve the mechanical problem of truss structures using the principle of VFIFE. The responses of the tower were calculated using the VFIFE program and were compared with the results obtained by traditional finite element methods. The influence of damping setting and calculating time step to the responses were investigated. Finally, the collapse analysis of the transmission tower under wind load was carried out using the VFIFE program. The results show that the displacements of the tower obtained by the two methods are very close. The total calculating time using the VFIFE program is about 1/20 of the time using the traditional finite element method, indicating that the computational efficiency of VFIFE is significantly higher than that of traditional finite element method. The results obtained by finite element methods are influenced by calculating time step and therefore trials on different time steps are suggested. VFIFE can be used to study the collapsed problem of transmission towers.
出处
《工程力学》
EI
CSCD
北大核心
2015年第11期63-70,共8页
Engineering Mechanics
基金
国家自然科学基金项目(51178425)
关键词
输电塔
风致响应
向量式有限元
动力分析
倒塌分析
transmission tower
wind-induced response
vector form intrinsic finite element
dynamic analysis
collapsed analysis
