BASIC THEORY AND MECHANICAL PROPERTY ON A NEW TYPE OF REPLACEABLE ENERGY DISSIPATION CONNECTOR
Luqi Xie 1*, Jing Wu 1, Chao Tong 1 and Chunyu Li 1
1 The Key Laboratory on Concrete and Prestressed Concrete Structures of Ministry of Education of China, Southeast University, Nanjing, China
A new type of replaceable energy dissipation connectors (REDC) fabricated in beam-column connections is presented in this paper, which is a kind of buckling-restrained metal yielding device, comprised by core energy dissipation steel bar, restraining member and connectors. The REDC could dissipate the seismic energy and convenient to replace to achieve seismic rehabilitation for the precast concrete frame. The basic theory and construction method of the REDC are introduced. The time history analysis on a frame with REDC is presented and its seismic response is compared with a common frame. The experimental study on the REDC is also presented to verify its mechanical property, ductility and hysteretic performance. The results indicate that the inter-story displacement of the structure is basically consistence with that of the common frame under moderate and rare earthquakes. However, a stable hysteretic property could be seen in the REDC on the frame, which indicates that the REDC can be effectively applied in seismic resistance. The experiment results also indicate that the REDC manufactured by Q235B steel could present a stable hysteretic property and achieve a high ductility capacity. The analysis results indicate that the REDC could be used in the frame structure in high seismic zones.
Replaceable energy dissipation connector; time history analysis; hysteretic property; ductility; seismic rehabilitation