Steel and Composite Structures

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Stability analysis of prestressed stayed steel columns with split-up crossarm systems

  • Li, Pengcheng (School of Civil Engineering, Chongqing University) ;
  • Li, Zhiqiang (School of Civil Engineering, Chongqing University) ;
  • Jia, Bin (Sichuan Institute of Building Research) ;
  • Wang, Hao (School of Civil Engineering, Shandong Jianzhu University)
  • Received : 2019.07.29
  • Accepted : 2019.10.21
  • Published : 2020.03.10
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Abstract

A Prestressed stayed steel column is an efficient and lightweight way with regard to enhancing the stability behaviour of a compression column. In the past, researchers primarily concentrated on investigating the behaviour of stayed steel columns with horizontal crossarms. However, this article focuses on prestressed stayed steel columns with split-up crossarm system, in which the crossarms are aslant and rotational symmetrically arranged. A mathematical formula calculating the optimal pretension that corresponds to the maximum critical buckling load was established according to geometric analysis based on the small deformation assumption. It was demonstrated that critical buckling mode of this stayed column is different from the one with horizontal crossarms. The governing imperfection direction that should be adopted in the nonlinear buckling analysis was determined in this work. In addition, the effects of crossarm inclination, stay diameter, and crossarm length on the stability behaviour were investigated. An influencing factor denotes the ratio of the load carrying capacity of the prestressed stayed steel column to the Euler load of the main column was also obtained.

Keywords

Acknowledgement

Supported by : Central Universities, National Natural Science Foundation of China

The research was supported by the Fundamental Research Funds for the Central Universities (No. 2019CDXYTM0032), the National Natural Science Foundation of China (No. 51808070), and the Fundamental and Frontier Research Project of Chongqing (No. cstc2018jcyjAX0535). These financial supports are gratefully acknowledged.

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