| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 104 === A column base connection is very important in the steel or SRC structures for transferring the forces successfully from the structure to the foundation, and preventing structural collapse in severe earthquakes. In structures with large columns, the conventional column-baseplate connection would not be able to resist high shear and moments in the connection. The steel has to be embedded in the RC pedestal, and shear studs are provided in the embedded steel part to transfer the forces into the RC pedestal. However, since the load transfer mechanism of longitudinal shear due to applied bending moment is still unknown [1], therefore the load transfer mechanism in the embedded steel column due to moment is still unclear. This indicates that this kind of connection needs to be analyzed and a proper design method should be proposed. An analytical model was established and verified with previous analytical results and 3D analysis. The results showed that the shear forces in steel column and RC pedestal were far larger than the applied load, and the presence of shear studs were able to reduce the shear forces significantly. A design guide was proposed and verified with nonlinear analysis, and later verified with an experimental study.
Analytical and experimental results showed that: (1) The EBSC-2D model can be used for analyzing embedded steel column in RC pedestal without shear studs; (2) The modified design guide is safe to be used for designing embedded steel column in RC Pedestal without shear studs; (3) Bearing strength cannot be added with shear studs’ maximum strength, since bearing failure would occur at a relatively small slip than the slip required to achieve shear studs maximum strength; (4) An unusual shear force transfer mechanism was present in the experiments; (5) Cyclic behavior of the RC pedestal is not good since the governing failure mode is RC shear failure.
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