首页|Development of earthquake-resilient precast concrete beam-to-column connections with bottom replaceable buckling-restrained brace dampers
Development of earthquake-resilient precast concrete beam-to-column connections with bottom replaceable buckling-restrained brace dampers
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NETL
NSTL
Elsevier
The strong column-weak beam yield mechanism is commended in current seismic design codes for reinforced concrete frames. However, the plastic deformations of concrete and reinforcements in the plastic hinge zone pose quite a challenge to the structural post-earthquake repair. To overcome this deficiency, a novel earthquakeresilient precast beam-to-column connection with bottom replaceable miniature buckling-restrained braces (MBRBs) is proposed in this study. The mechanical hinge is adopted at the top of the beam as the rotational center, while the MBRBs are placed at the beam bottom to dissipate the seismic energy under strong earthquakes. The mechanical model and seismic design procedure of the resilient connection are developed. Three full-scale beam-to-column connections with different configurations are introduced and designed. Quasi-static cyclic loading tests were conducted to gain insights into the seismic performance and post-repair behavior of the connections. Test results demonstrated that the connections with welded MBRBs exhibited excellent hysteretic behaviors even at the 4 % inter-story drift ratio. As expected in design, the damage was concentrated at the MBRBs, and the functionality of the connection can be recovered rapidly by replacing the damaged MBRBs. A numerical approach based on the birth-death element technology is developed to model the repaired connection. The numerical results showed the finite element model can effectively capture the pre- and post-repair seismic performance of the beam-to-column connection.
Seismic resilienceBeam-to-column connectionPost-earthquake repairReplaceable damperDamage controlBirth-death element technologyDESIGN
Chen, Huiming、Bai, Jiulin、Liu, Jiacheng
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Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area||Chongqing University School of Civil Engineering
NETL
NSTL
Elsevier
