Static and dynamic cyclic performance of a low-yield-strength steel shear panel damper

Low-yield-strength steel 100 (LYS100) is widely applied to design a metallic shear panel damper for its high ductility. A low-yield-strength steel shear panel damper (LYSPD) with the maximum shear strain of 70% is developed and verified by static incremental cyclic loading in previous research. In this paper, further research on the performances of the developed LYSPD including the fatigue characteristic is carried out by static and dynamic constant cyclic tests. Four different shear strain amplitudes (20%, 30%, 40% and 50%) are selected in both static and dynamic tests. Two frequencies, 0.5 Hz and 1 Hz, are adopted for each of the four amplitudes in dynamic tests. Large differences such as stress softening, fatigue cycle deterioration, and temperature increase caused by high strain rate and internal friction are observed in dynamic tests. The test results suggest that the seismic performance of the LYSPD may be overestimated by static tests and the dynamic tests are essential to guarantee the reliability of the LYSPD. (C) 2012 Elsevier Ltd. All rights reserved.