Effective length factors for branching structures

被引：0
作者：
Wu Y. [1 ,2 ]
Xu Y. [3 ]
Li Q. [1 ]
机构：
[1] Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin
[2] Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin
[3] China Resources Land(Beijing)Co., Ltd, Beijing
来源：
Li, Qingpeng (hitssrclqp@gmail.com) | 2018年 / Science Press卷 / 39期
关键词：
Branching structure; Displacement method; Effective length factor; Eigen value buckling analysis; Structural stability;
D O I：
10.14006/j.jzjgxb.2018.06.006
中图分类号：
学科分类号：
摘要：
The members of branching structure are mainly subjected to compressive force under external loads, and the stability of the structure or its members is the governing factor in design. However, because of the complexity of branching structures, recommended values of the effective length factors are not covered in the current specification. To solve this problem, this paper starts with analytical studies. A displacement method is used to derive the analytical formulas of effective length factors for simple plane branching structures, and several influential factors of these recommended values are determined. Subsequently, an improved first-order global buckling method for branching structures is proposed. Effective length factors of the structural members of each level in the spatial branching structures are investigated by using eigen value buckling analysis. Moreover, the changing characteristics influenced by the height-span ratio and the stiffness ratio between two adjacent structural members are revealed. Finally, recommended values for the effective length factors for the trunk and branches of varying levels are obtained based on a statistic analysis. Based on the study above, it is found that the buckling modes of branching structures with lateral deformations are similar to free-stand columns, and the buckling modes of branching structures without lateral deformations are similar to simply-supported columns. According to this feature, the global effective length factors can be determined rapidly, then the effective length factors for the trunk and branches of each level can be calculated, which provides a basis for the stability design of branching structures. © 2018, Editorial Office of Journal of Building Structures. All right reserved.
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页码：53 / 60
页数：7
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