Study Of Bearing Behavior For Main Beam Of Single Pylon Cable-stayed Bridge Without Backstays

In the course of bridge development to long span and light type, Cable-stayedBridge has become the most popular bridge type of long span bridge due to itsaesthetic appeal and economic advantages. Many Cable-stayed Bridges withinimitable sculpt have become the symbol architecture for function and sight. SinglePylon Cable-stayed Bridge without Backstays is a kind of Cable-Stayed Bridge,which has inimitable modeling, complex structure and stress.Because the cable-stayed bridge is the highly statically indeterminate structure,some key parts are in the complex stress state in the course of the construction.General structure analysis method can't analyze its complex stress. In order to assurethe security of the engineering design, it should be applied three dimensions stressanalysis.The Single Pylon Cable-stayed Bridge without Backstays on the Yi Tong River ismainly studied in this thesis。Three stress finite element analysis of its girder has beenfinished by large currency software ANSYS. And model test has been made in orderto analyze the girder's bearing behavior. Finite element calculation and model testanalysis are complementary, and they can be proved by each other. In the finite element analysis, Two kinds of models with bar and without barin the middle of girder have been made in order to compare the effect on the stress ofgirder produced by bar and pre-stress in the middle section of cable point. At thesame time, the finite element calculation has been divided into12 load cases in orderto compare the state of the girder's stress distribution produced by each load. The organic glass girder model is designed, and the sling force and pre-stressare controlled by the sensor designed by author. Corresponding to the finite elementcalculation, model test realized 4 load cases simulation.ANSYS modeling, loading and post process are realized by use of the APDL,secondary development of later disposal technology is finished, macro file is written,the pre disposal and later disposal speed is improved.The stress distribution rule summed up by the finite element calculation accordswith the result of model test, which proves the results by two methods and offers thesufficient basis for the bridge's mend design. These rules and characters can be usedas reference to the design of other Single Pylon Cable-stayed Bridge withoutBackstays.Dynamics character is analyzed in the last, and dynamics character parameter isobtained which offers the important parameter for stability design of the bridge.