Numerical evaluation of buckling behavior in space structure considering geometrical parameters with joint rigidity
来源期刊：中南大学学报(英文版)2014年第3期
论文作者：Su-Deok Shon Kyung-Ju Hwang Seung-Jae Lee
文章页码：1115 - 1124
Key words：space frame; geometric nonlinearity; snap-through; bifurcation; initial imperfection; joint rigidity
Abstract: The buckling behavior of single layer space structure is very sensitive. The joint rigidity, moreover, is one of the main factors of stability which may determine the entire failure behavior. Thus, the reasonable stiffness of joint system, which is neither total pin assumption nor perfect fix condition, is very important to apply to the real single layer space one. Therefore, the purpose of this work was to investigate the buckling behavior of single layer space structure, using the development of the upgraded stiffness matrix for the joint rigidity. To derive tangential stiffness matrix, a displacement function was assumed using translational and rotational displacement at the node. The geometrical nonlinear analysis was simulated not only with perfect model but also with imperfect one. As a result, the one and two free nodal numerical models were investigated using derived stiffness matrix. It was figured out that the buckling load increases in proportion to joint rigidity with rise-span ratio. The stability of numerical model is very sensitive with the initial imperfection, responding of bifurcation in the structure.
Su-Deok Shon1, Kyung-Ju Hwang2, Seung-Jae Lee1
(1. School of Architectural Engineering, Korea University of Technology and Education,
Cheonan Chungnam, 330-708, Republic of Korea;
2. School of Architecture, University of Seoul, Seoul 130-743, Republic of Korea)
Abstract:The buckling behavior of single layer space structure is very sensitive. The joint rigidity, moreover, is one of the main factors of stability which may determine the entire failure behavior. Thus, the reasonable stiffness of joint system, which is neither total pin assumption nor perfect fix condition, is very important to apply to the real single layer space one. Therefore, the purpose of this work was to investigate the buckling behavior of single layer space structure, using the development of the upgraded stiffness matrix for the joint rigidity. To derive tangential stiffness matrix, a displacement function was assumed using translational and rotational displacement at the node. The geometrical nonlinear analysis was simulated not only with perfect model but also with imperfect one. As a result, the one and two free nodal numerical models were investigated using derived stiffness matrix. It was figured out that the buckling load increases in proportion to joint rigidity with rise-span ratio. The stability of numerical model is very sensitive with the initial imperfection, responding of bifurcation in the structure.
Key words:space frame; geometric nonlinearity; snap-through; bifurcation; initial imperfection; joint rigidity
