In terms of the moment frame system of steel structures, early brittle fractures developed in the H-shaped beam-to-column connection during the Northridge and Kobe earthquakes, thereby indicating insufficient seismic performance of these components. In this study, experiments were conducted on two-side shear connections of web and rib plate reinforcements of the flanges on an H-shaped beam-to-column connection. According to the test results, the H-shaped beam-to-column connections with two-side shear connections of beam web and rib plate reinforcements of the flanges were superior to the existing connections in terms of initial stiffness, energy dissipation capacity, and plastic rotational capacity. The test values exceeded 4.2%, 0.027 rad, and 125% in terms of story drift ratio, total plastic rotation capacity, and full plastic moment of the beam, respectively. Accordingly, the proposed H-shaped beam-to-column connection showed better performance than that of the intermediate moment frame regarding seismic design.
Post-installed expansion heavy-duty anchors and wedge anchors have been used for fixing and bonding steel frames in the remodeling and construction of structures requiring a high level of safety. The use of post-installed expansion heavy-duty anchors and wedge anchors in the remodeling and construction of structural buildings have significantly increased since the 2000's. However, we observed that a reliable design standard or construction specification for post-installed expansion heavy-duty anchors and wedge anchors had not been established. Therefore, the objective of this study is to obtain basic technical data of post-installed expansion heavy-duty and wedge anchors in the remodeling and construction of buildings. Experimental tests were performed to evaluate the combined strength and fracture mode of post-installed expansion heavy-duty and wedge anchors implanted in concrete. The experimental variables were the loading angle and combined load (tensile and shear loads). The test results for the loading angles and combined loads were compared with the values obtained using the American Concrete Institute design standard.
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