ABSTRACT
Since the time of the construction of the rst extradosed bridge, the dierences between cable-stayed bridges and extradosed bridges have been debated. Both of these bridge types have structures that use stays for reinforcement (Figure 11.4). However, rather than simply assuming that an allowable stress of 0.6fpu could be used in the case of an extradosed bridge, it became desirable to provide some structural rationale. At that point, attention focused on the distribution ratio of vertical load borne by the girders and the stay cables. en aer investigation of many existing bridges, the fact that there are no clear boundaries between extradosed and cable-stayed bridges was found (Ogawa and Kasuga 1998).
