Design and analysis based energy dissipation for self-anchored cable-stayed suspension bridge based-on elastic-plastic theory

The fiber model of Dalian Bay Bridge is established with simulating plastic hinge by distribution hinge model, nonlinear time-history is analyzed by Midas/Civil based-on elastic-plastic theory. Compared of time-history results between elastic to elastic-plastic stage showed: the internal forces of structure are reduced mainly in bending moment and axial-force on tower root, because of dissipation of seismic energy inputting after into elastic-plastic stage, but longitudinal displacement increased on top of tower and middle span of beam due to the rotation of plastic hinge. After setting viscous dampers between beam and tower, longitudinal displacement of tower roof and beam has a more reduced significantly, but also reduced tower root bending moment and shearing.