（1 江西省电力设计院， 南昌 330096； 2 南昌大学工程力学研究所， 南昌 330031）

［摘要］建立了双支撑杆的主材或斜材横向位移稍大时的失稳模式，寻找出双支撑杆的两种失稳模式与结构尺寸、主材或斜材横向位移的关系，给出两种失稳模式间的转换临界值，该值的准确性得到了试验的验证。研究成果对于指导双支撑杆的尺寸设计、提高输电铁塔主材或斜材的抗失稳能力均具有应用价值。

［关键词］主材; 斜材; 双支撑杆; 失稳模式; 弯曲变形; 转换临界值

中图分类号：TU391      文献标识码：A      文章编号：1002-848X(2014)17-0015-05

Influence of the double-supporting bracing on buckling modes of legs or diagonal bracings in transmission tower

Wang Dengke1, Liao Gongyi1, Cheng Huahu2, Huang Mojia2

 (1 Jiangxi Electric Power Design Institute, Nanchang 330096, China; 2 Institute of Engineering Mechanics, Nanchang University, Nanchang 330031, China)

Abstract:The buckling modes were established for legs or diagonal bracings of the double-supporting bracing under the large transverse deformation. The two buckling modes  of the double-supporting bracing were studied as well as its relationship with structure sizes and transverse deformations of legs or diagonal bracings. The transition threshold values between the two buckling modes were presented and the values were checked by buckling experiments. The results have practical significances in the guidance of the double-supporting bracing size design and developing the anti-buckling capacity of legs or diagonal bracings in transmission towers.

Keywords:leg; diagonal bracing; double-supporting bracing; buckling mode; bending deformation; transition threshold value

*国家自然科学基金项目（11172122, 51268043），江西省“赣鄱英才555工程”项目，江西省电力设计院项目。

通讯作者：黄模佳，教授，博士生导师， Email: mojiahuang@hotmail.com。

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