The purpose of this study is to test and explore the characteristics of the new lead-extrusion damper (LED), which is manufactured in the department of Civil Engineering of Feng-Chia University. The Stroke of the tested damper is +-10mm and the maximum movement of the laboratory test is +-5mm, which is provided by the MTS(machine with a maximum capacity of 25tons). The test results have proved that the new LED possesses excellent capability for energy absorption. The hysteresis loop behaves like "plastic solids" or "coulomb dampers". The intemal force and the speed of the movement are correlated while the damper is subjected to sin wave type of loadings. By comparing the numerical results obtained from the proposed analytical model with experimental results under various displacements and frequencies, it is concluded mat a good agreement between the computational and experimental results has been achieved.
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