Abstract
The application of recycled aggregate concrete (RAC) in concrete filled steel tubular (CFST) structures can eliminate the deterioration of concrete performance caused by the original defects of the recycled aggregate, which also provides an effective way for the recycling of waste concrete. In this paper, a test of a small scale model of a circular CFST column-reinforced concrete (RC) beam frame with RACs under low cyclic loading was presented in order to investigate its seismic behavior. The failure modes, plastic hinges sequence, hysteresis curve, skeleton curve, energy dissipation capacity, ductility and stiffness degeneration of the frame were presented and analyzed in detail. The test results show that the design method of the recycled aggregate concrete filled circular steel tube (RACFCST) frame complies with the seismic design requirements of a stronger joint followed by the stronger column and the weaker beam. The hysteresis curve of the frame is symmetrical, showing a relatively full shuttle shape; at the same time, the ductility coefficient of the frame is greater than 2.5, showing good deformation performance. In addition, when the frame is damaged, the displacement angle is greater than 1/38, and the equivalent damping ratios coefficient is 0.243, which indicates that the frame has excellent anti-collapse and energy dissipation abilities. In summary, the RACFCST frame has good seismic behavior, which can be applied to high-rise buildings in high-intensity seismic fortification areas.
Highlights
The use of recycled aggregate is one way to potentially extend the life of natural resources by supplementing their supply and reducing the environmental impacts of material extraction as well as the impact of construction demolition in landfills [1]
In the test of the recycled aggregate concrete filled circular steel tube (RACFCST) frame, the plastic hinge appears first in the beam and in the column, which illustrates that the failure mechanism of the RACFCST frame structure results from beam hinge failure, which meets the seismic design requirements of "strong
It can be seen from the figure that the hysteresis curve of the RACFCST frame has the following characteristics: (1)
Summary
The use of recycled aggregate is one way to potentially extend the life of natural resources by supplementing their supply and reducing the environmental impacts of material extraction as well as the impact of construction demolition in landfills [1]. As a green building material, recycled aggregate concrete (RAC) can effectively deal with construction waste and realize the sustainable development of construction resources [2]. The RAC can provide effective support to increase the stability of the external steel tube. Based on this theory, many scholars [13,14,15,16,17,18,19,20,21] have carried out experimental research on the mechanical properties of RACFST under different forces (e.g., axial compression, eccentric compression and cyclic loading). At present, research on the RAC filled circular steel tube (RACFCST) frame structure is still scarce. The general behavior of the RACFCST frame was compared with that of the reinforced concrete (RC) frame proposed by Zhou et al [22]
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