About the author:

1. China Railway Construction Group Co. , Ltd. , Beijing 100040, China;2. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China

Abstract:

The large⁃span irregular roof of Changde Railway Station building on Changde⁃Yiyang⁃Changsha High⁃speed Railway is supported by an irregular frame and a spatial steel truss structure. Theproject features include uneven structural stiffness and limited on⁃site construction space. Therefore, thelifting point scheme is designed for different lifting zones of the roof, and reasonable lifting point schemesare selected based on structural force and deformation analysis. For the larger central area of the roof, theeffects of the deformation caused by single point asynchronous lifting, vertical rail direction staggeredasynchronous lifting, and irregular frame beam segment asynchronous lifting on the roof are compared.The structural stiffness near the irregular frame beam of the roof is relatively high, and the lifting has abroader impact range. Lifting at the outer lifting points mainly causes the outer cantilever section to archupwards, with minimal impact on the deformation of the internal roof along the rail direction. Based onthe analysis of the effect of the single point asynchronous lifting, a quantitative analysis method andadverse condition determination strategy for the response of multi⁃point asynchronous lifting of the roof areproposed. Using this method, the impact amplitude and adverse conditions of asynchronous lifting atdifferent lifting points can be quickly determined by referring to tables.