Experimental, numerical and analytical study on seismic performance of shear-bending yielding coupling dampers

摘要

A novel yielding damper combining traditional shear and bending yielding devices was proposed and analyzed, in which the bending plates were clamped on both sides of the shear plate to restrain its buckling. Cyclic tests were performed to examine the seismic behavior of the shear-bending yielding coupling (SBYC) dampers. Additionally, finite-element (FE) models were established to investigate the interactive mechanism between the shear and bending plates in detail, particularly in the post-buckling stage. The analysis results revealed that the shear plate exhibited a high buckling mode and that the tensile strips were gradually distributed within the adjacent two bending plates. According to the analysis results, a force-shear angle model was developed for predicting the performance of the SBYC damper, which accounted for both the high mode buckling and stress states of the shear plate in the post-buckling stage. Various parameters, including the height-to-space ratio, gapto-shear thickness ratio, and thickness of the shear plate, were incorporated into the parametric analyses. The FE results agreed well with the predicted results from the force-shear angle model. The experimental and analytical results provide guidance for the application of the SBYC damper in engineering practice.