Research On Static Performance Of Cable-girder Anchorage For Combined Road And Railway Cable-stayed Bridge

In this paper, taking combined road and railway truss cable-stayed bridge in ChongqingHongyan Village as the engineering background, and on the basis of referring to relevantpapers, through numerical finite element analysis, the local spatial finite element model of earplate Cable-Girder Anchorage is established. Taking anchor structures of the largestcable-stayed cable force, the maximum horizontal component of cable force and themaximum vertical component of cable force as the research object, under the action ofpermanent loads into bridge and operational design cable force, analysis stress distributionand displacement distribution of anchorage zone plates.Besieds anchoring force transmissionmechanism, destroying properties and ultimate bearing capacity of anchor structure is studied.The main contents are as follows:1. Overview of the development and application of cable-girder anchorage, researchstatus and existing problems of the cable-girder anchorage was discussed, and summarized themain forms of cable-girder anchorage and design principles;2. Summarized ear plate Cable-Girder anchorage structural features and mechanicalcharacteristics, introduced three analysis methods of ear plate cable-girder anchorage, andcompared national specifications on the relevant provisions of the pin connection structure.3. Analysised the stress distribution and displacement distribution characteristics of thelargest cable-stayed cable force, the maximum horizontal component of cable force and themaximum vertical component of cable force corresponding to the anchor plate area underdesign cable force with the finite element simulation. Evaluated safety reserves of the plateswith each anchor structure, while the pin and lug plate contact characteristics were analyzed,and finally studied the anchoring structure for force transmission mechanism. The resultsshowed that the force transmission plate smooth and reliable, but the plate on the distributionof cable force is uneven, the lateral plate safety margin is low.4. Analysis the ear plate girder anchorage cable structure ultimate load analysis to studythe failure mechanism with nonlinear finite element, given the limit load anchorage, trackanchorage zone main panels to stress, displacement with load, and to explore the anchor boxboard piece of cable force distribution with load variation. 5. To further understand the structure of anchor plates force performance, analysis itsparameter sensitivity, the main research anchor box plate thickness variation on the anchoragezone plate stress and the impact of cable force distribution, show the causes of board memberstress concentration.