Abstract:To study the specific factors affecting the swing construction results of asymmetric composite beam cable-stayed bridge, an asymmetric steel-concrete composite beam cable-stayed bridge is taken as the research background. The parameter sensitivity analysis is carried out by using finite element method, focusing on the effects of bracket stiffness, initial tension force of cables and the balance weight on the structure force and alignment of bridge during construction. The results show that: 1) the bracket stiffness has little effect on the internal force of the composite beam of the cable-stayed bridge; 2) Increasing the initial tensioning force can reduce the bending moment at the mid span of the beam, it also increase the bending moment of the beam at the tower root. Properly adjusting the initial tensioning force can reduce the displacement of the beam after it is separated from the support and the displacement difference between the asymmetric cantilever ends in the mid span on both sides; 3) Excessive counterweight will extremely increase the hogging bending moment in the side span, which may become a controlling factor of the design, but appropriate counterweight weight can reduce the downward deflection of cantilever end in the middle of main beam span.