The Steel Box Girder Incremental Launching Construction Local Stability Analysis Of Large Span Self-anchored Suspension Bridge

The paper takes the incremental launching of steel box girder of TaohuayuYellow River Main Bridge in Zhengzhou as project background, applying major finiteelement software ANSYS to carry out simulation calculation, this paper studied thekey questions during the incremental launching process from integral stress, localstress, and local stabilization respectively. Also, it analyzes the mechanics character ofsteel box girder and part of components relevant parameters’ effect on its stabilityunder the status of finished bridge. It plays a guiding role on local stability analysis ofsuch type of these bridges in the future.Completed the major work of this paper is asfollows:1) Traditional analysis method is adopted. From the perspective of main beam’smaximum negative moment and maximum reaction force, it discusses a reasonableoptimal design theory of guide beam.2) Using numerical method to analyze the stress character and changingregulation of temporary piers during the launching process, determining the mostunfavorable condition which is used as the calculation condition of local analysis onsteel box girder.3) Consider the stress mode of steel box girder in chute, contrast the stress statebetween with rubber pads and without rubber pads under the beam. Moreover, bychanging the constraint length of different rubber pads, and conducting bucklinganalysis on local stability under a number of typical operating conditions, itdemonstrated that rubber pads greatly improve the local stability of steel box girder.4) Through using plate and shell elements to build finite element model of bridgecompletion stage, and analyzing parameter changes of each components (roof,baseboard, longitudinal clapboard, ribbed stiffener and diaphragm, etc) before andafter the change of steel box girder design, it analyzes how the parameter changeseffect the performance of local stability of steel box girder under the status of finishedbridge.5) In view of the actual situation of Taohuayu bridge project, this paper putsforward a detailed and reasonable construction monitoring program, which is providesa reference for bridge construction design of the same type.