Research On Behaviors Of Cable Anchorage Zone Of Self-anchored Suspension Bridge With Single Pylon ? Composite Beam

Self-anchored suspension bridge is welcomed in urban bridge construction because it is an aesthetical attractive and economical bridge type and not dependent on suitable foundation ground.With the development of self-anchored suspension bridge,the use of steel-concrete composite stiffening girder in self-anchored suspension bridge is increasing.Ii is significant to research the mechanics performance of the cable anchorage zone of self-anchored suspension bridge with steelconcrete composite stiffening girder.The mechanics performance of the cable anchorage zone is studied in this thesis in the backdrop of Jiahe Bridge,which is a self-anchored suspension bridge with steel-concrete composite stiffening girder.The main work and research contents are described as follows:(1)The research methods of the cable anchorage zone are introduced and the disadvantages of the traditional research methods are indicated.The principle and merits are elaborated of multi-scale modeling method researching on behavior of the cable anchorage zone of self-anchored suspension bridge,which can effectively remedy the shortcomings of traditional research methods with elastic boundary.(2)In order to study the static performance of the whole bridge structure of Jiahe Bridge and study the behavior of the main cable anchorage zone preliminarily,a three-dimensional beamcolumn finite model of the whole bridge is established by using Midas Civil.(3)The strain of main components of the cable anchorage zone is monitored during the system transformation to analysis the stress distribution in cable anchorage zone preliminarily.The local finite model of main cable anchorage zone and the multi-scale model of Jiahe Bridge are established by ANSYS.By comparing the FEA results with the measured results,the rationality and scientific nature of the multi-scale modeling method are verified.The multi-scale modeling method has higher precision for the analysis of the cable anchorage zone.(4)The stress state and the force transfer path of the main cable anchorage zone under design load are analyzed based on the multi-scale model.The analysis results show that the safety reserve of the main stress components is high,the transmission path of the cable force among the main components is clear and smooth,the cable force is distributed among the main components rapidly and evenly.(5)The steel anchorage system is optimized to composite anchorage system.The calculation shows that the maximum stress of the composite anchorage structure decreases greatly and the stress distribution is more uniform due to the composite effect between steel and concrete.The composite anchorage can reduce the steel consumption and improve the reliability of the anchorage structure.The research contents of this paper can direct the anchorage structure design of self-anchored suspension bridges.