Fatigue test and deformation performance of prefabricated replaceable graded-yielding energy-dissipation connectors

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 49-59.

LI Fangyu1，DU Yongfeng1,2，LI Hu1，CHI Peihong1

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Abstract

A replaceable graded-yielding energy-dissipation connector (RGEC) is proposed for prefabricated concrete beam-column joint. The RGEC can control the yield and damage and improve the rehabilitation property of the structure. Low cyclic loading test on 5 specimens were conducted to study the mechanical properties of RGEC, such as fatigue performance, energy dissipation capacity, etc. The experimental results indicate that RGEC have good fatigue performance and stable hysteretic behavior, and the hysteretic curves of RGEC specimens exhibit a clear graded yielding mechanism. The stiffness, bearing capacity and energy dissipation capacity of specimens remain stable in the normal working stage, and still have sufficient performance reserve when reaching fatigue failure, and the failure form is mainly in the form of bending-shear failure of the bending-shear component. Parametrical analysis was carried out based on ABAQUS for deformation performance of the bending-shear component and the buckling-constrained component. The results show that the strain uneven distribution is aggravated with the increase of the width-thickness ratio or constraint clearance of the buckling-constrained component, and the buckling wave number is increased with the increase of the width-thickness ratio. The deformation mode changes from bending deformation to shearing deformation with the decrease of yield stress contour height ratio or aspect ratio of bending-shear component.

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prefabricated concrete frame structure / graded yield / replaceable connector / low cyclic loading test / fatigue performance / deformation performance

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LI Fangyu1，DU Yongfeng1,2，LI Hu1，CHI Peihong1. Fatigue test and deformation performance of prefabricated replaceable graded-yielding energy-dissipation connectors[J]. Journal of Vibration and Shock, 2023, 42(22): 49-59

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