Bridges, Tunnels and other Transportation Structures
Accelerated Bridge Construction (ABC) offers advantages such as rapid construction, limited traffic disruption, fast project delivery, cost savings for the formwork, more accuracy in construction due to prefabrication, better quality control, higher durability, reduced weight of the bridge structure, enhanced safety, and less environmental impacts. ABC has been successfully deployed in low seismic regions. However, given the uncertainty about the adequate performance of connections between precast elements, application of ABC in high seismic regions has been limited. The research investigates the use of two types of emulative connections in a precast bent. The column-to-footing connection consists of member socket, while the column-to-cap beam connection is grouted ducts. These connections intend to emulate the traditional formation of plastic hinges in the bridge columns during an earthquake. A half-scale specimens with emulative connections was tested under quasi-static cyclic loading. Furthermore, several half-scale cantilever columns with member socket and grouted ducts connections were tested under uni and bi-directional quasi-static cyclic loading. Experimental results showed adequate seismic performance of the specimens compared to cast-in-place construction. The research presents simplified analytical models that can be used by bridge practitioners to simulate the cyclic performance of these emulative cast-in-place connections. Existing analytical models such as Takeda-Thin has been used and refined to predict the cyclic performance of the emulative connections under uni and bi-directional earthquake loading.