Pc Cable-stayed Bridge Is Reasonably Constant Load Cable Force And Construction Of Cable Forces Determined

Prestressed concrete cable-stayed bridge is a highly coupling structure in design and construction, and cable tensile force of dead load and that during construction are crucial influencing factors. In this paper, researches in four aspects are done taken Wu hekou Bridge as example. (1)Using synthetically Minimum Bending Energy method and Stress Balance method together, the optimization model of cable force of dead load is established, and the reasonable completed cable force is obtained by linear programming principle. (2)A finished state is obtained with forward-calculation by presuming the controlling cable forces. After compare it with ideal finished state, a new finished state is calculated by amending the cable force resolved by the optimization model of cable force during construction. Finally, iterate above steps until differences between them are neglectable. (3)Taking into account actual construction schemes and practical stresses of cable-stayed bridge, a simple feasible computation way is put forward in the cable midst tensile forces. (4)The sag nonlinear impacts of cables on elastic modulus, cable forces and slope angles are analyzed and results are modified correspondingly. The above results can be applied to actual construction controlling of Wu hekou Bridge.