The Three Main Truss Three Cable Plane Cable Tension Optimization And Space Force Performance

With the three cable planes-three trusses cable-stayed bridge of Tianxingzhou in Wuhan as its engineering background,the paper studies the static properties of this bridge. The primary works in this paper are presented as follows:1.With the geometric nonlinearity considered, the space model of the three cable planes-three trusses cable-stayed bridge is established in ANSYS to simulate the composition of steel and concrete and the connection way between tower and beam.2. With the internal force and geometrical linetype of the plane structure as controlling condition, longitudinal optimum cable tension is obtained in 1stOpt based on the influence matrix method. According to the longitudinal optimum cable tension,the relationship among cable tension,displacement and internal force of main truss is studied based on the space model in this paper.3. The mechanical characteristics of main member under live load, temperature, braking force and wind in large span cable-stayed bridge with plate-truss composite beam is studied, influence of design parameters upon the mechanical characteristics of main member, such as transverse beam rigidity, longitudinal bracing rods and "K" staying, is also researched.4. Simulation contrast analysis is done to three trusses and double trusses structure system. The system rigidity, mechanical characteristics of main member, transverse beam and lateral combination is compared. The advantages and disadvantages of the two kinds of structure system are summarized.