Structural Analysis Of The Construction Stages Of Extrodosed Cable-Stayed Bridge With Extension Pylon

Firstly, this paper systematically analyses the relevant literatures and introduce the latest progress in many aspects of research about extradosed cable-stayed bridge. Based on one bridge across the Yangzi river of China, the structural behavior of the extradosed cable-stayed bridge in construction stages and the completed bridge is analyzed using Midas/Civil, a general commercial finite element software. And the structural behavior of the pylon in construction stages is analyzed comprehensively, using another finite element software BSAS. The calculated stress, internal forces and displacements are studied on by statistical comparison method.The extradosed cable-stayed bridge is a type of bridge between cable-stayed bridge and continuous beam (rigid frame) bridge. The bridge in this paper is a rigid beam extradosed cable-stayed bridge. In completion state, static behavior of the main beams and cables under individual loads and load combination is showed, the response of the beam because of the moving load proves that the beam of this bridge is rigid; The tensile stress of main beam produced by system heating-up and cooling cannot be ignored; Cable force plays a key role on the main beam properties.In construction stage, comparatively analysis of the impact of construction loads on the cable and main beam during the construction process for the cast-in-place cantilever method are made. And according to the result, the load effect of dead weight, concrete shrinkage and creep, Cradle and other loads and the variation of cable force during the construction process are analyzed. In addition, further analysis of the extension pylon in construction stages is made. The medial tensile stress produced by moment is canceled out by the compressive stress generated by the deadweight and the temporary rod. The tensile stress in outside of pylon, because of prestress, gradually faded away following the concrete casting.