Stiffness sensitivity study of upper structure components in extradosed cable-stayed bridges

Based on an extra-dosed cable-stayed bridge under construction,the sensibility comparisons of stiffness between pylon,girder and cables are done under evaluation criteria of cable force,internal force of girder and pylon,structural displacement and fundamental frequency. Due to the calculation of sensitive factor,the order arrangement of stiffness design in the three components is raised,which the conclusions will be the important references for similar engineering and providing basis for parameters design.