Modified strip model for indirect buckling restrained shear panel dampers

Abstract The indirect buckling restrained shear panel damper (IBRSPD) comprises stiffeners and energy dissipation units that are processed from a hot-rolled H-beam. Under shear loading, the web plates of the units induce a stable energy dissipation capacity to resist earthquakes, and the stiffeners can effectively limit the buckling of the web panels. Then, the partial tension field (PTF) is generated in the web plates owing to the indirect buckling restraint, which leads to the free boundary condition in the vertical edges. This mechanism has not been considered in previous models of the shear panel damper (SPD). In this study, a modified strip (MS) model is proposed to characterize the web plate behavior, and equations for the inclination angle of the PTF action are presented. According to the development degree of the PTF area, four stages are determined, and the components of the shear strength, namely, the shear buckling strength (SBS) and the PTF action, are calculated for each stage. Through monotonic analyses, a comparison between the finite element model and the MS model is conducted to verify the validation of the newly proposed model. In addition, the contributions of the SBS and PTF components are analyzed under cyclic loading while considering the loading history and the pinching effect. With respect to the energy dissipation capacity, the height of the IBRSPD is discussed in relation to the energy dissipation efficiency. Finally, the MS model is adopted in a seismic analysis to investigate the reduction of the seismic response.