Abstract

Info

Title:: Research on Unbalanced Support Sliding Technology of Long-span Bidirectional Beam String Structure

Author(s):: GUO Meng; GAO Wei-wei; LIANG Cun-zhi; GAO Ding-ding; YUAN Quan; NIU Gong-ke; China Academy of Building Research

Keywords:: beam string structure; sliding construction; unbalanced support; temporary support; finite element analysis; force mechanism

Abstract:: The authors presented a new method of sliding construction — the technology of unbalanced support sliding construction, which increased the vertical reaction forces of the original bearing reaction and weakened the middle sliding temporary supports through imposing appropriate prestress on cables during construction. Taking the National Stadium as an example, the stress of different key bars with different prestress imposing on the cable, vertical displacement of certain key points, and reaction force of support, etc,were analyzed. Moreover, the possibility of unbalanced sliding construction for longspan bidirectional beam string structure was discussed. The study results show that the middle sliding temporary supports can be weakened, and the amount of intermediate temporary supports for steel under the premise of ensuring structural safety can be reduced. Furthermore, the total costs of sliding construction will reduce.