Analysis of SSI Effect on Damping Effect of Mild Steel Damper

摘要

The thesis takes a ten-story frame structure with three span as research object to study the effect of Soil-Structure Interaction (SSI) on the damping effect of mild steel damper. The equivalent linearization model is adopted as the constitutive model of soil. A material damping input method available in ANSYS was adopted to account for the difference of the soil damping ratio and that of the concrete superstructure in SSI systems. Shanghai bedrock waves were selected as the input earthquake, called SHW1 wave and SHW2 wave. The results indicate that the mild steel damper has relatively good damping effect on frame structure under rigid foundation assumption or considering SSI effect and it can control displacement response, inter-story shear force and other indexes of structure well. The damping rate considering SSI effect decreases in some degree, which indicates that SSI effect will reduce the damping effect of mild steel damper on frame structure, thus under rigid foundation assumption, the design of damping structure's mild steel damper will be unsafe in engineering application.