| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 95 === The objective of this study is to investigate the seismic resistance of a new type of precast steel reinforced concrete (SRC) beam-to-column connection with the rectangular SRC column confined by a multi-spiral cage. The multi-spiral cage is a device of five interconnected spirals, named “5-spirals”, with a large spiral at the center and four small ones at the corners. The innovation of applying the 5-spirals to SRC column is to take its superiority in concrete confinement as well as its efficiency in automatic production for precast construction. Three full-scale beam-to-column connections were tested under horizontal cyclic loading. All specimens were designed to meet the strong-column weak-beam (SCWB) requirement.
The test results showed that all of the specimens developed satisfactory plastic rotation capacity. The hysteretic loops observed from the cyclic loading tests indicated that the spirally confined SRC beam-to-column connections demonstrated excellent performances in both strength and ductility. As required by the AISC Seismic Provisions (2005), the tested connections were capable of sustaining an interstory drift angle of 4.0% radians. For each test, the measured flexural resistance at drift angle of 4.0% radians was larger than 80% of the plastic flexural strength Mp of the connected beam.
It is also noted that the flanges of the steel beam connected to the SRC column were directly groove-welded to the steel section within the SRC column without using the reduced beam section (RBS) technique. The test results indicated that the reinforced concrete in the connection zone provided an “effective constraint” to the steel beam embedded in the SRC column. This constraint had successfully “protected the welded joint” from premature failure, and assisted the beam to develop satisfactory plastic deformation right out of the SRC column face.
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