Abstract

Info

Author(s):: TAN Li-xin; GUO Peng-xin; HE Chang-jie; ZHANG Yao-kang; China Construction Fifth Engineering Division Corp., Ltd

Keywords:: large-span beam net; prestressing; analysis model; subarea tension; once-tension forming; technical measure

Abstract:: Aiming at the construction of 3×10⁴ m² prestressed platform of central part of Ice and Snow World project at the 100 m deep pit in Changsha, in order to compare the differences between subarea construction and onetime construction, based on the finite element software MIDAS/Gen, the finite element simulation of whole construction process was carried out. Under the action of self weight load, the bending moment diagrams of the subarea construction and the oncetension forming beam were contrasted. Under the combined action of self weight load and prestress load, the moment diagrams of the beam and the stress nephograms of the bottom and top of the beam were contrasted. The technical measures of subarea construction were put forward from the angle of engineering construction. The results show that the total bending moment of beam midspan is equal to that of the support, so the simulation analysis of subarea construction is feasible. The effect of subarea tension construction is basically consistent with the effect of oncetension forming.