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Bent Connection Options for Curved and Skewed SMC Bridges in Low-to-Moderate Seismic Regions
Simple-made-continuous (SMC) multispan concrete bridges are popular in low-to-moderate seismic regions, and sometimes horizontally curved and/or skewed configurations are needed to accommodate complex terrain. Typical SMC multispan bridges can adopt different connections between the intermediate bent cap and the continuous superstructure (bent connection). Compared to their straight counterparts, skewed and curved SMC bridges exhibit more complex seismic performance, making the design choice of using bent connections critical in low-to-moderate seismic regions. Nonlinear time-history seismic analyses using structural analysis and design software are carried out on 12 bridge models with four geometric configurations (i.e., straight, skewed, curved, and skewed and curved) and three bent connections (i.e., fixed, pinned, and roller). The skewed and curved bridge is found to exhibit a larger overall seismic response than the other bridges for most bent connections. Different bent connections affect the seismic response of a bridge by modifying the structural load path, which in turn changes the seismic load transmitted between the superstructure and the substructure. For straight, skewed-only, and curved-only bridges, pinned or roller bent connections are found to be more seismic-friendly than fixed bent connections in terms of their relatively smaller overall seismic demands, apart from abutments. For skewed and curved bridges, the situation becomes complex, and a fixed bent connection might be preferred in some instances.
Bent Connection Options for Curved and Skewed SMC Bridges in Low-to-Moderate Seismic Regions
Simple-made-continuous (SMC) multispan concrete bridges are popular in low-to-moderate seismic regions, and sometimes horizontally curved and/or skewed configurations are needed to accommodate complex terrain. Typical SMC multispan bridges can adopt different connections between the intermediate bent cap and the continuous superstructure (bent connection). Compared to their straight counterparts, skewed and curved SMC bridges exhibit more complex seismic performance, making the design choice of using bent connections critical in low-to-moderate seismic regions. Nonlinear time-history seismic analyses using structural analysis and design software are carried out on 12 bridge models with four geometric configurations (i.e., straight, skewed, curved, and skewed and curved) and three bent connections (i.e., fixed, pinned, and roller). The skewed and curved bridge is found to exhibit a larger overall seismic response than the other bridges for most bent connections. Different bent connections affect the seismic response of a bridge by modifying the structural load path, which in turn changes the seismic load transmitted between the superstructure and the substructure. For straight, skewed-only, and curved-only bridges, pinned or roller bent connections are found to be more seismic-friendly than fixed bent connections in terms of their relatively smaller overall seismic demands, apart from abutments. For skewed and curved bridges, the situation becomes complex, and a fixed bent connection might be preferred in some instances.
Bent Connection Options for Curved and Skewed SMC Bridges in Low-to-Moderate Seismic Regions
Hou, Guangyang (author) / Chen, Suren (author)
2017-06-01
Article (Journal)
Electronic Resource
Unknown
Bent Connection Options for Curved and Skewed SMC Bridges in Low-to-Moderate Seismic Regions
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