The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
In order to study the degree of influence of the structural design parameters of the inclined-bent single-tower mixed-beam cable-stayed bridge in the completed state of the bridge, a finite element model was established with the Zhangjiakou Wei'er Bridge as the engineering background. Based on the perturbation principle of structural parameter sensitivity analysis, a sensitivity analysis index was introduced. The sensitivity of structural parameters such as the position of the bridge steel-concrete joint section, the local temperature load of the bridge tower, the initial tension of the stay cable and the vertical inclination angle of the back cable were studied with the bending moment at the consolidation of the tower and girder, the longitudinal displacement of the bridge top, the back cable force, and the maximum deflection of main beam selected as the control targets. The analysis results show that the position of the bridge steel-concrete joint section, the initial tension of the stayed cable, and the vertical inclination angle of the back cable have a greater influence on the deflection of the main girder and the line shape of the pylon of the oblique curved single-tower hybrid cable-stayed bridge. When the span ratio of the concrete beam and the steel beam changes by 15.73%, the longitudinal displacement of the tower top and the mid-span deflection of the main beam will increase by 5.14% and 29.4% respectively from the initial position. The local temperature load of the pylon mainly affects the longitudinal deformation of this type of pylon, and it is less sensitive to the force of the pylon. Among them, the vertical inclination angle of the back cable has the most significant impact on the diagonally curved single-tower mixed-beam cable-stayed bridge. When the vertical inclination angle of the back cable changes by 7%, the maximum change in the longitudinal displacement of the tower top from the initial position also reaches 205.8%.
杨懋,缪长青,王旭东. 斜弯独塔混合梁斜拉桥参数敏感性分析[J]. 科学技术与工程, , ():复制