Chapter 4: The Construction Process of Segmental Bridges
above, called top down construction, helped protecting the natural environment at the site as far as technically possible.
Figure 4-3: The Linn Cove Viaduct, North Carolina, U.S. (taken from Rives 1997, p41)
22.214.171.124 Concluding the Cantilevering Process
The cantilevering process will finally have reached its end when both girders meet at midspan and need to be connected. Three different ways exist to achieve this connection in the structural system (Mathivat 1983). A hinged connection can be installed that allows horizontal movements in the superstructure. As Mathivat (1983) writes, this system is structurally relatively simple, yet the hinges are complicated details and the overall structural redundancy of the system is reduced. Podolny and Muller (1982) also mention the lower ultimate load-carrying capacity of the hinged system and the higher susceptibility to creep and relaxation phenomena. Furthermore, the two superstructure halves can have a slight angle between them as deflections occur, which is detrimental to “the appearance of the bridge and the user’s comfort” (Podolny and Muller 1982, p36).