基于杆系离散单元法的单层网壳结构屈曲行为研究  

Buckling behavior of single-layer reticulated shells based on member discrete element method

作　　者：叶继红 张梅[2] YE Jihong;ZHANG Mei(Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Concrete and Pre-stressed Concrete Structure of China Ministry of Education, Southeast University,Nanjing 210018,China)

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116 [2]东南大学混凝土与预应力混凝土结构教育部重点实验室,江苏南京210018

出　　处：《建筑结构学报》2019年第3期50-57,共8页Journal of Building Structures

基　　金：国家重点研发计划(2017YFC1500703)

摘　　要：离散单元法因适合处理大位移、非线性和非连续等问题而逐渐被应用于结构工程中,但采用离散单元法进行结构屈曲全过程分析还有待研究。为此,基于杆系离散单元法的基本理论和计算方法,提出离散元力控制法及离散元位移控制法,研究上述方法在结构弹性屈曲全过程分析中的特点及适用性,同时给出离散元位移控制法(力控制法不需要单独处理)对不同荷载工况的处理方法及离散元法在进行结构弹性屈曲分析时的计算流程。采用Fortran语言自编程序,对典型算例进行弹性屈曲全过程分析,与传统方法相比,该方法无需组集刚度矩阵,对几何非线性问题不需特殊处理即可模拟结构的屈曲行为,更具优越性,并通过结果对比,验证了离散单元法在单层网壳结构弹性失稳全过程分析中的有效性。Discrete element method(DEM) has been gradually applied in structural engineering due to its capabilities of dealing with large displacement, nonlinearity and discontinuity issues. However, using the DEM for structural buckling process analysis remains to be studied. Therefore, the discrete element force control method and displacement control method were proposed on the basis of the member discrete element method in this study, and the characteristics and applicability of the above methods for whole process structural elastic buckling analysis were investigated. Meanwhile, treatment scheme for the displacement control method under different load conditions(no need for separate treatment for the force control method herein) as well as the calculational procedure of the DEM for structural elastic buckling analysis were proposed in this study. Finally, buckling process analyses of several typical examples were carried out using the program complied by Fortran language. Compared with other conventional numerical methods, the DEM which can simulate the buckling behavior of the structure without assembling the stiffness matrix and special treatments, is more advantage for handling geometric nonlinearity issue. Additionally, the effectivity of the DEM in the whole elastic buckling process analysis of single-layer reticulated shells was verified through the comparison between buckling behaviors obtained using DEM and those of the published studies.

关 键 词：单层网壳结构 杆系离散单元法 屈曲分析 位移控制法 力控制法 数值模拟 

分 类 号：TU393.3[建筑科学—结构工程] TU312.1