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Published in:
2022 | OriginalPaper | Chapter
Connection Strength of Braces with Angle Steel and Channel Steel
Authors : Nobuhiko Tatsumi, Shoichi Kishiki
Published in: Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas
Publisher: Springer International Publishing
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Abstract
Braced frame structures are used for low-rise steel buildings, and angle steels or channel steels are often adopted as the main seismic component. The structures are used as not only house but also emergency public shelters in event of disaster. Therefore, it is important to secure the sufficient seismic performance. However, a reconnaissance of the recent earthquake reports that the brittle fracture at the effective cross section of brace. Angle braces and channel braces have the inevitable eccentricity between the brace and gusset plate, and this detail is a disadvantage in terms of connection strength.
In the present paper, connection tests of braces were carried out to clarify the effect of connection detail on strength at the connection. Specimens are braces connected to gusset plates using bolts. In these tests, the monotonic tensile loading was employed to investigate the effect of connection detail on the ultimate strength. The main parameters were cross sections of braces, the number of bolts and tension of bolts. The test results can be summarized as follows: (1) the ultimate strength basically increases in proportion to the number of bolts at the connection, regardless of the cross-sectional shape of the brace; (2) the ultimate strength of connection using more than 5 bolts does not increase compared to that of connection using 5 bolts; (3) for channel steel, the effective ratio of cross-sectional area was smaller in the braces with the width less than 150 mm.