Seismic Behavior and Design of Steel Braced Frame System with Self-Centerinq Friction Damping Brace

摘要

This paper presents the seismic behavior of a new type of steel concentrically braced frame systems with a special type bracing element termed self-centering friction damping brace (SDB). SDB serves as a passive energy dissipation device with its core self-centering component made of superelastic Nitinol wire stands. Results of validation experiments on scaled SDB specimens are first presented in this paper. The seismic behavior of steel concentrically braced frame buildings with SDB is investigated through nonlinear static and dynamic analysis. The earthquake ground motions corresponding to three different seismic hazard levels-frequent earthquakes, design basis earthquakes and maximum credible earthquakes- are employed in the nonlinear time history analysis. The results of the nonlinear time history analysis show that the SDB frame can achieve a seismic response level comparable to that of the buckling-restrained braced frame while having significantly reduced residual drifts under frequent earthquakes and design basis earthquakes. Brief design recommendations for the SDB frame buildings are also discussed in this paper.