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Analysis of the seismic performances of structures reinforced by self-centering buckling-restrained braces

Jin Yongxu, Xu Man, Jia Jie

Archives of Civil Engineering

2023

Vol. 69, nr 3

645--663

The self-centering buckling-restrained brace (SC-BRB) may achieve self-restoration for structures and, to a certain degree, diminish the substantial seismic residual deformation following rare earthquakes when compared to the usage of the conventional buckling-restrained brace (BRB). It may be possible to reduce the abrupt change in stiffness at the location of the strengthened stories and make the outrigger better at dissipating energy by improving the design of the energy-dissipation outrigger. This study compares the seismic performances of two types of energy-dissipation outriggers with BRB and SC-BRB web member designs during rare earthquakes so that the changes can be measured. The results show that using the SC-BRB web member design reduces the maximum inter-story drift ratio by an average of 7.68% and increases the average plastic-energy dissipation of the outrigger truss by 8.75%. The evaluation results show that the SC-BRB outrigger truss structure has better structural regularity and energy-dissipation performance. It has the ability to efficiently regulate the structural seismic response and lessen primary-structure damage.

Seismic behavior of a friction-type artificial plastic hinge for the precast beam–column connection

Huang Hua, Li Ming, Zhang Wei, Yuan Yujie

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e201, 2022

This paper proposed a replaceable friction-type artificial plastic hinge (FAPH) to connect the prefabricated concrete members, characterized by direct load transmission and streamlined configuration. The FAPH device replaced the beam-end plastic hinge region in the precast structures, which could protect the concrete joint core area and other concrete components. The experiment of a precast beam–column connection with FAPH and a cast-in-situ beam–column connection was carried out. The experimental results showed that the FAPH connection had better hysteresis performances with higher bearing capacity, energy dissipation, and ductility than the cast-in-situ concrete connection. Moreover, the finite element model was calibrated and employed to perform parametric analyses, including the axial load ratio, the friction factor, the bolt preload, and the initial clearance. The FE analysis results showed that the FAPH connection would have a more attenuation of the friction force under the higher axial load ratio. Besides, the seismic performance of FAPH can be effectively improved with the increase of the friction factor and the bolt preload, and the FAPH connection exhibited a stable performance with various initial clearances. Based on the parametric analysis results, the formulas for the yield and peak bending moment capacity for the FAPH device were proposed.