71corvette
Structural
I'm currently in the process of designing a single span, simply supported highway bridge to be constructed in two phases (one phase construction is not possible). The proposed superstructure will be a concrete deck supported by steel girders.
My concern has to do with the concrete deck placement for the second phase. Because one half of the new bridge will be open to traffic during the deck placement, I have concerns about the differential deflection between the two sections of deck slab during concrete placement & curing. To put it another way, the newly placed phase II section of deck will see no live load, and therefore no deflections, while the phase I section of deck will likely see thousands of live load deflection cycles during the cure period. Typically, we have tied the two secitons of deck together using mechanical rebar splicers.
I'm interested to find out how others have approached this problem in the past.
Thanks,
Tim
My concern has to do with the concrete deck placement for the second phase. Because one half of the new bridge will be open to traffic during the deck placement, I have concerns about the differential deflection between the two sections of deck slab during concrete placement & curing. To put it another way, the newly placed phase II section of deck will see no live load, and therefore no deflections, while the phase I section of deck will likely see thousands of live load deflection cycles during the cure period. Typically, we have tied the two secitons of deck together using mechanical rebar splicers.
I'm interested to find out how others have approached this problem in the past.
Thanks,
Tim