Research On The Deformation And Force State Of The NXZT Asymmetric Single-tower Swivel Cable-stayed Bridge

the NXZT bridge is a three-span single-tower double cable plane swivel cable-stayed bridge with a span-arrangement112m+80m+32m and single-track railway prestressed concrete. The section of the beam is "U" shape, two-direction constructure of inverted-Y in shape was adopted on tower,112m+80m beam employ swivel construction. The bridge has the advantages of a novel structure and complex stress. This thesis will systematically study the mechanical performance of the bridge before swivel, in swivel and after swivel.1. Using Finite Element Method to ensure the press of the80m cross beam body, which will guarantee the balanced of the tower’s bottom in swivel and benefit the construction of the NXZT bridge.2. Repeatedly calculate the target cable force, stretching sequence and tension force in swivel, by which the prestressing process safety, the balance of the beam bodies in swivel and the reasonable force of beams and towers can be ensured. It can also guarantee the safety of the NXZT bridge in swivel and the successful seating of the beam ends after swivel.3. Repeatedly calculate the target cable force, stretching sequence and tension force when the bridge having been finished,by which the prestressing process and the reasonable stress on the bridge after tension can be guaranteed, the number of cable tension reduced and the working efficiency of the staff improved.4. Considering the process and methods of construction, the research on deformation and mechanical performance of the NXZT bridge under the combined action of the dead load and the most unfavorable live load is conducted, whose results show that the construction of the bridge, being with sufficient strength and stiffness, is safe.This thesis will provide reliable basis for the design and Construction monitoring of he NXZT bridge and reference to other similar asymmetric swivel cable-stayed bridges.