论文部分内容阅读
深圳大学1#桥主桥采用双层桥面钢桁腹预应力混凝土组合结构。主桥结构采用空间放射性钢管混凝土组合桥墩,提高了主梁无横隔板状态下的抗弯与抗扭性能。钢桁腹采用整体式组合节点,用Twin-PBL键加抗剪栓钉的组合连接方式。全桥采用三向预应力布置,上下桥面板纵横向均设置预应力,保证了结构的整体工作性能,同时形成悬臂组合结构;三角形钢管混凝土桁架拉杆施加预应力,在无体外预应力束状态下,起到了降低拉杆的应力、增强节点的连接、满足主梁抗剪要求等三个方面的作用。主桥采用预制拼装、无模板支架施工建造方法。对主桥结构采用Midas/Civil 2010空间有限元分析程序进行分析的结果表明,空间放射性钢管混凝土组合桥墩、整体式组合节点处于弹性工作状态;主梁第1阶自振频率1.13Hz,结构整体刚度好;第1阶屈曲稳定分析特征值为74.6,结构稳定性好。
The 1 # bridge main bridge of Shenzhen University adopts double deck steel truss belly prestressed concrete composite structure. The main bridge structure adopts space radio frequency (CFST) composite pier to improve the bending and torsion resistance of the main girder under the condition of no diaphragm. Steel truss belly with integrated combination of nodes, with Twin-PBL key plus shear studs combination connection. The whole bridge adopts the three-way prestressing arrangement, and the prestressing force is set in the vertical and horizontal directions of the upper and lower bridge deck to ensure the overall workability of the structure and form the cantilever combination structure. The prestressing force is applied to the triangular steel pipe concrete truss rod, , Played a role in reducing the stress of the tie rod, enhancing the connection of the node, meeting the requirements of the main beam shear resistance and so on. The main bridge with prefabricated assembly, no template support construction method. The analysis of the main bridge structure using the Midas / Civil 2010 space finite element analysis program shows that the space radioactive CFST composite piers and monolithic composite joints are in elastic working condition. The first order natural frequency of main girder is 1.13Hz, the overall structural stiffness Good; first-order buckling stability analysis of eigenvalues of 74.6, good structural stability.