Study of seismic behavior of recycled aggregate concrete-filled steel tubular columns

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.

Download Full-text

Seismic behavior of recycled aggregate concrete beams under cyclic torsion

Construction and Building Materials ◽

10.1016/j.conbuildmat.2016.10.101 ◽

2016 ◽

Vol 129 ◽

pp. 193-203 ◽

Cited By ~ 4

Author(s):

Xiaohan Wang ◽

Bingkang Liu ◽

Cong Zhang

Keyword(s):

Seismic Behavior ◽

Concrete Beams ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Aggregate Concrete ◽

Cyclic Torsion

Download Full-text

Investigation on Seismic Behavior of Recycled Aggregate Concrete Structures under Dynamic Loadings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.772.149 ◽

2013 ◽

Vol 772 ◽

pp. 149-155

Author(s):

Chang Qing Wang

Keyword(s):

Seismic Behavior ◽

Fatigue Behavior ◽

Experimental Studies ◽

Concrete Structures ◽

Recycled Aggregate Concrete ◽

Shaking Table ◽

Frame Structure ◽

Recycled Aggregate ◽

Scale Model ◽

Aggregate Concrete

Based on the ever finished investigations of physical and mechanical properties of recycled aggregate concrete (RAC), and a series of experimental studies on the durability, the fatigue behavior, mechanical behavior and the seismic behavior of RAC components. A full scale model of a one-storey block masonry structure with tie column + ring beam + cast-in-place slab system and a one fourth scaled model of a 6-storey frame structure, which are made of reinforced recycled aggregate concrete, are tested on a shaking table by subjecting it to a series of simulated seismic ground motions, and the seismic behaviors of the RAC structures were experimentally investigated. The dynamic characteristics and the seismic response were analyzed and discussed. The overall seismic performance of RCA structures are evaluated, the analysis results show that the recycled aggregate concrete structures with proper design exhibits good seismic behavior and can resist the earthquake attacks under different earthquake levels in this study. It is feasible to apply and popularize the RAC block masonry buildings less than 2 stories and the RAC frame buildings less than 6 stories in the region where the seismic fortification intensity is 8.

Download Full-text