The vibration control device such as the damper can be used to reinforce the seismic performance of structures. The damper is activated by the deformation of structures during earthquake; however, the deformation of structures is extremely small, causing difficulty in using the damper. Therefore, there is a need for a method capable of amplifying small deformities and transmitting them to the damper. The purpose of this paper is to develop and evaluate a displacement amplification seismic system using cable-pulley. The appropriate cable was selected through a cable tensile performance test and the results of the frame experiment were compared with theoretical displacement amplification ratio values. As a result, it may be said that the proposed system using cable-pulley is useful for displacement amplification.

The proposed hybrid damper installs at a coupling beam and consists of a high-damping rubber (HDR) and steel pin. The proposed hybrid damper adopted a pin-lock system acts as a viscoelastic damper under wind load (small displacement) while it behaves as a hysteretic damper under earthquake load (large displacement). In this paper, the pin-lock mechanism and structural performance of the proposed hybrid damper is evaluated through experiment. Experiments were carried out with the variables which displacement, loading frequency and steel pin quantities were used. Test results showed that the pin-lock mechanism and the performance of the hybrid damper under a large displacement were verified. Also equivalent damping ratios of HDR were increasing at a small displacement as displacement amplitudes were increasing. However HDR did not depend on frequency,

The objective of this research is to investigate the analytical behavior of a displacement amplification-type seismic control system, which is installed in a structure to increase the seismic energy dissipation of a damping system by amplifying displacement during the earthquake.

In the recent years, composite beam is now being frequently used not only in reduction of the story height but also saving material quantity. There has been heightened interest in composite beam. In this study, new composite beam was proposed, which composed of H-section and U-section members. Angles were used for shear connectors for composite action. In order to investigate the performance of the suggested composite beam, test programs were carried out to evaluate the composite beam's structural behavior and effectiveness as conducted experiments consist of push-out tests, beam flexural tests and beam-column connection tests.