Mechanical Properties And Experimental Research Of Single Pylon Cable-stayed Curved Bridge Without Backstays

Single pylon cable stayed bridge without backstays is a new form of bridgestructure. A thorough, in-depth and systematic research on this new kind of bridge israrely seen, for its later occurrence and uniqueness. More than ten bridges of this kindwere built in China with linear shape of their transverse pylon and longitudinal girder.In contrast, Lichuan Bridge has a curve shape according to its plane-design methods,while the tower is also set with a curve pylon. The bridge has a complex structuresystem, and its design method is innovative both home and abroad. Therefore, relativeexploration, research and practice was conducted, in order to ensure the bridgestructure safety, reasonableness and controllable, and provide reference for designand construction of bridges of same type.In this article, based on the engineering background of Lichuan Bridge, actualstress characteristics and distribution rule of stress of this special structure wasdiscussed through the finite element analysis and model test study. The main contentscan be listed as follows:Firstly,whole bridge calculation was held through the bridge general softwareMIDAS2010to build a space finite element model. Bridge integral static calculationresults were analyzed, as well as the content of local spatial fine analysis and theboundary conditions of curved tower section model test were determined. Stabilityanalysis of the bridge under completed bridge states was also conducted with abovemodel.Secondly,through1:15curvilinear tower model experiment, stress distributionand performance of the most unfavorable section of the most unfavorable tower wasstudied. With comparative analysis of the model test results and the elastic-plasticfinite element analysis results, the fidelity of planar and spatial calculation resultswas discussed.Thirdly,local fine analysis of the LIchuan Bridge was conducted using the finiteelement analysis software Ansys. Analysis of the consolidation part among beam,tower and pier was for achieving the stress state of the key parts under mostunfavorable load during construction and completed stage, in order to improve stressstate of the weak areas by adjustment of prestressing. Moreover, analysis of the cabletower anchoring area under various loads was for obtaining the weak stress region of the structure, and further understanding of the real stress state. Besides, analysis ofcable anchorage zone of the beam was to achieve its stress state under combinedconditions of long term effect during normal-using limit state, through which theactual stress state could be simulated, and rationality and safety of the structure couldbe testified.