Research Of The Space Force Performance Of Double Main Ribbed Concrete Cable-stayed Bridge

Large span prestressed concrete cable-stayed bridge often use double main ribbed girder, The bridge deck force performance directly affects the force performance of whole bridge. Under the vehicle load, the stress of bridge deck is very complex. In order to study the mechanical behavior of the deck of double main ribbed girder, this paper takes Liuchonghe Bridge as the engineering background, establishes the space finite element model of the girder segment, analyzes the internal force, stress and displacement in the section of the longitudinal, transverse pivot and cross and the corner of the bridge deck when it under the most unfavorable vehicle load, and to further explore the calculation method of the effective distribution width and the crack resistance of the deck of double main ribbed girder. The main work is as follows.1)Introducing the overview of the concrete cable-stayed bridge, the trend of the concrete cable-stayed bridge, the development and the characteristic of the concrete cable-stayed bridge girder, the research status of the deck of double main ribbed girder. Discussing the thin plate bending theory.2) Research to the modeling of the double main ribbed girder of the concrete cable-stayed bridge, application of ANSYS to build space finite element of the main girder bridge deck of Guizhou Liuchonghe bridge. By using the influence line to study the most unfavorable vehicle load of the section of the longitudinal, transverse pivot and cross and the corner of the bridge deck. And analysis the internal force of the above section when it under the most unfavorable vehicle loads. Analysis mechanical properties of key sections of the bridge deck when it under the most unfavorable vehicle load of longitudinal pivot section.3) Calculate the effective distribution width of the bridge deck when it under the most unfavorable vehicle loads of the longitudinal pivot and cross section,and compared the results with values calculated in accordance with national norms, proposed the formula of the effective distribution width of the bridge deck. Study the transverse tensile stress of the bridge deck when it under the vehicle loads, analysis the crack resistance of longitudinal cracks of the double main ribbed girder.