Study On Some Key Technologies Of Wide Cable - Stayed Bridge

As a new type of bridge structure, the wide extradosed cable-stayed bridge havecame out only more than30years,but it has developed more perfect, whatever instructure, material properties or in the theoretical study. With rich designexperience and the use of advanced technology, bridge designers optimizestructure system, further innovation of the wide extradosed cable-stayed bridgeconstantly refresh the breakthrough in span length and width,etc. In our country,because of the densely populated, urban road generally is very wide, in order tobetter the combination of the development of the city road, extradosedcable-stayed bridge is also more and more wide,the extradosed cable-stayedbridges which have builted are more than30meters wide, obviously,the wideextradosed cable-stayed bridge has occupies the dominant position. Althoughthe wide extradosed cable-stayed bridge got great development in China, and thewhole structure internal force distribution are also very familiar to relevantprofessionals, but the stress distribution in some local locations are still not veryclear,such as zero block of bridge girder, not only the structure is complex, butalso the load is very changeable, so it is difficult to grasp at designtime;meanwhile the wide extradossed cable-stayed bridge’s wide deck makes itsmain beam structure usually a multi-cell box girder, which under external loadswill produce uneven distribution of stress, especially under the influence of thecable, the uneven distribution phenomenon is very serious; also in theconstruction monitoring there are some key technologies affected the full-bridgesecurity, and not yet been widely used. For the above, this article detailedlyintroduces the wide extradosed cable-stayed bridge’s some key technologies andresearch methods in the design and construction monitoring, and using the YingRiver extradosed cable-stayed bridge as the engineering background, first usingthe bar system finite element software bridge Dr.3.1.0detailedly analyze thewhole force performance of the Ying River extradosed cable-stayed bridge, thencombined with the spatial entity finite element software ANSYS12.0analyzedthe stress changes of zero block before and after system conversion and thestess distrbution during the completed bridge phase, finally after making a littlechange on the the standard section of the Ying River extradosed cable-stayed bridge, and using the symmetry principle, established the entity ANSYS model,and combining with the truss model which estabished by using the softwareMIDAS/CIVIL2010analyzed the shear lag effect of main girder and itsvertical displacement function, the whole paper has certain referencesignificance for the design, construction monitoring and multi-cell box girde’sshear lag effect theory study of the same type bridge.