Abstract
To study the difference in hysteretic behavior of specimens of circular concrete-filled CFRP-steel tube under different influencing factors, 12 specimens were designed, and their failure modes and P-Δ curves were studied. ABAQUS was used to simulate the specimens’ P-Δ curves and deformation mode. Based upon the simulation results, the stress distribution of all of the specimens’ component materials and the interaction between the steel tube and concrete was analyzed throughout the entire loading process, and the trilinear model, the restoring force model of circular concrete-filled CFRP-steel tube, was proposed. All of the specimens’ P-Δ curves were full and demonstrated excellent hysteretic behavior. The specimens’ P-Δ curves, the skeleton curves, and deformation mode were simulated by the ABAQUS, and the simulation results agreed well with the experimental results. Further, the results of the restoring force model built based upon the trilinear model agreed well with the finite element simulation results.
Highlights
In recent years, earthquakes are more and more widespread in the world. e distribution of seismic zones is not uniform, but they are widely distributed
Zhou et al [5] carried out the pure torsional hysteretic behavior test of hollow sandwich concrete-filled steel tubular specimens with section form and void ratio as the main parameters. e experimental results show that the initial elastic stiffness is close to the unloading stiffness, and the specimens show good energy dissipation capacity [6], and the hysteretic behavior of circular section hollow sandwich concrete-filled steel tube is better than that of square section [7, 8]
With the increase of the lateral displacement, there is a small bulge at the connection between the rigid fixture and the specimen
Summary
Earthquakes are more and more widespread in the world. e distribution of seismic zones is not uniform, but they are widely distributed. Zhou et al [5] carried out the pure torsional hysteretic behavior test of hollow sandwich concrete-filled steel tubular specimens with section form and void ratio as the main parameters. E experimental results show that the initial elastic stiffness is close to the unloading stiffness, and the specimens show good energy dissipation capacity [6], and the hysteretic behavior of circular section hollow sandwich concrete-filled steel tube is better than that of square section [7, 8]. Referring to the hysteretic test of concrete-filled steel tube, the specimens’ failure modes and the lateral force-deflection P-Δ curve were studied. The model’s calculation results were compared with the results of finite element simulation to verify the model’s accuracy
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