Optimization Study On Closure Technics For Multi-span Continuous Girder Bridge

With the deepening of the design theory and the development of the construction methods, especially with the application of the high strength prestressed materials and large deformation joints, prestressed concrete continuous beam bridge is advancing toward multi-span and long associated. During the long and great bridge construction period, the main beam of the construction methods and the sequence of construct closure and the system conversion have a significant impact on the main beam dead load internal forces.The paper rely on the Mian Bridge of Shi-gu Mountain continuous beam bridge as the engineering background, consulted a large number of references home and abroad. Summed up the multi-span continuous beam bridge force characteristics and the home and abroad development status of closure skill of prestressed concrete continuous bridge. Systemly introduced the continuous bridge construction control structure calculation theory. By the Mian Bridge of Shi-gu Mountain continuous beam bridge construction control, beam stress and deformation was measured.Besides,the finite element model of real bridge was built,Actual value and theoretical value of beam stress and deformation for different construction phase were compared. In the end,the influence of multi-span continuous beam bridge force and deformation with different closure sequences and the removal time of temporary consolidation was deeply studied.Finally, the study results has been applied in the construction control of this bridge.