Evaluation of the seismic performance of braced pin fuse frame using friction

Document Type : Original Article

Authors

• Mohsen Gerami ¹
• Vahid Eskandarian ²

¹ Department of Civil Engineering Faculty-,University of Semnan,-Semnan-,Iran

² Department of Civil Engineering Faculty,-University of Semnan-,Semnan-,Iran

10.22067/jfcei.2022.73405.1074

Abstract

Pin Fuse is a new type of structural fuse that is installed at the place of plastic hinge of steel structure. The fuse acts through rotational sliding of steel surfaces on each other during an earthquake. The presence of frictional force between the fuse plates causes the loss of seismic energy. Pin fuse frame is a special braced moment frame that its moment connection is of pin fuse and its diagonal brace has a friction fuse which prevents buckling of the brace. In this study, first in comparison with full scale test of pin fuse frame was validated. Afterward, based on the verification, three braced steel frame of the pin fuse at six, nine and  twelve  story were designed. Also, similar frames of special moment with RBS connection and special diagonal brace was designed to compare the seismic performance of the two groups frames. Finally, 42 nonlinear time history analysis of the two frame was performed with opensees software in two dimensions using seven scaled Earthquake acceleration (Near fault) and the results of nonlinear analysis of the two frames were compared. The results of the analysis showed that the pin fuse frame has a much better performance than the special braced frame in terms of seismic energy loss due to the activation of friction fuses(activation of 60% of beam fuses and 85% of brace fuses). Another advantage of the braced pin fuse frame is the supplying of 80% of life safety performance level and significantly reducing the repair cost after an earthquake.

Keywords

• Friction Fuse
• Pin Fuse System
• Braced Pin Fuse Frame

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