Research On Collapse Behavior Of Wide Box Girder Of Cable-stayed Bridge With Single Cable Plane

Single cable plane cable-stayed bridge, with its unique shape is increasingly being adopted city bridge, but the city bridge traffic volume and partial load of issues are outstanding. In addition, the cable’s space effect can’t increase the torsional rigidity of the single cable plane cable, and torsional rigidity is generally believed that the bridge is mainly provided by the main beam. The width of the cable-stayed bridge with a span compared to conventional beam bridge’s are larger. it is necessary to careful calculate and analysis the anti overturning performance of the cable-stayed bridge. Relying on a single cable cable-stayed bridge project, analyzing its maximum cantilever stage and the final stage of the anti-overturning torsional performance.Specific content:1.On the comparison to the existing calculation methods for modeling, determining a suitable method for computing study of single cable plane cable-stayed bridge wide-body torsional performance of the method. According to comparative analysis, by using the theory of plate and shell analysis model is set up;2.Based on a single cable plane wide-body cable-stayed bridge, using finite element analysis software for its typical construction stage and into a bridge phase were analyzed, and the calculation of partial load caused by the section torsion Angle of key indicators, such as analysis of torsion caused by bridge eccentric loading stress of each part of the bridge. According to the calculation and analysis, it is concluded that bridge resistive overturning safety factor is high;3. For further proven single box room wide box girder of each detail feet against the performance impact sensitivity, the article is going to analysis selection of different thickness on the parametric and various parameters on the bridge of the torsional stress sensitivity;4. For further proved the central double cable plane cable-stayed bridge compared to the single cable in the face of the influence of the torsional, in the case of other conditions unchanged, the article is going to compare the corresponding section torsion Angle and torsion stress caused by partial load with changing central double cable plane line spacing. According to the analysis, cable plane distance change from 0.1 cm to 300 cm girder bear the torque reduced less than 1%;5. Against torsion performance impact analysis of the pylon of beam connection way, the other partial load effect, auxiliary piers and the risk of side piers will inevitably have a negative reaction, so the parametric analysis was carried out on the bearing transverse distance, analysis of various parameters on the bridge of the torsional stress sensitivity. According to the analysis, the change of the pylon of beam connection mode of cross section torsion Angle effect is very small, change bearing transverse distance against torsion performance improve significantly.