Finite Element Analysis of Steel Box Girder Construction Process of Cable-Stayed Bridge

For this study,the installation process of the steel box girder of the main bridge of Xiazhang Sea-Crossing Bridge was taken as the background.The lifting points for installation were optimized through the finite element calculation of the steel box girder sections.Originally,there was a small number of lifting points and the problem of stress concentration also existed,after the optimization,a sound installation condition of multiple lifting points and good stress distribution were created.The natural vibration property of the sections of the steel box girder was studied to guide the application of the equipments which showed vibration during the construction process.The maximum stress near the derrick crane under the transient working condition was analyzed and calculated,so as to control the most unfavorable working stress during the construction process and ensure the safety of the construction.