TY - JOUR
T1 - Seismic performance of high-strength anchor rebar column-foundation connection for CFST
AU - Wang, Xuanding
AU - Xu, Tianxiang
AU - Liu, Jiepeng
AU - Wang, Saining
AU - Chen, Y. Frank
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (51890902) and Scientific and Technological innovation Foundation of Chongqing (cstc2019yszx-jscxX0001). A the area of specimen cross-section, Ab the area of anchor reinforcing bars, Ab1 the area of single anchor reinforcing bars, Ac the area of concrete, At the area of steel tube, D the diameter of steel tube, E the energy dissipation coefficient, Ec the elastic modulus of concrete, fb the yield strength of anchor reinforcing bars, fco the unconfined concrete strength, fcu the cubic compressive strength of concrete, ft the yield strength of steel tube, Kj the averaged circumferential stiffness of a specimen, L the distance from the foundation surface to the upper side of end plate, lh the height of the steel hinge, M the bending moment at peak load, N the applied axial load, n0 The axial load ratio, nb the number of anchor reinforcing bars, P the lateral load, Pmax the lateral load of a specimen at peak state, Py the lateral load of a specimen at yield state, Pu the lateral load of a specimen at ultimate state, R the radius of the steel tube, rbi the vertical distance from the centroid of ith anchor reinforcing bar to the central axis of column section, ts the thickness of steel tube, ab the reinforcement ratio, ? the ductility coefficient, ? the lateral displacement, ?max the lateral displacement of a specimen at peak state, ?y the lateral displacement of a specimen at yield state, ?u the lateral displacement of a specimen at ultimate state, ?h the average value of transverse strain, ?h-L the transverse strain of steel tube on the left-hand side, ?L the axial strain of anchor reinforcing bars on the left-hand side, ?R the axial strain of anchor reinforcing bars on the left-hand side, ?v the average value of longitudinal strain, ?h the transverse stress of steel tube, ?v the longitudinal stress of steel tube, ?z the equivalent stress of steel tube, Author Statement. Xuanding Wang. Xuanding Wang has contributed to the conceptualization, project administration, writing-original draft, and writing-review & editing of the manuscript. Tianxiang Xu. Tianxiang Xu has contributed to the conceptualization, data curation, investigation, methodology, project administration, software, validation, writing-original draft, and writing-review & editing of the manuscript. Jiepeng Liu. Jiepeng Liu has contributed to the conceptualization, formal analysis, funding acquisition, project administration, supervision, validation, writing-original draft, and writing-review & editing of the manuscript. Saining Wang. Saining Wang has contributed to the project administration, supervision, validation, writing-original draft, and writing-review & editing of the manuscript. Y. Frank Chen. Y. Frank Chen has contributed to the project administration, supervision, writing-original draft, and writing-review & editing of the manuscript. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10
Y1 - 2020/10
N2 - The anchor rebar column-foundation connection (ARCFC) is proposed for concrete filled steel tube (CFST) column to simplify the construction process of column-foundation connection. In this paper, a total of eight specimens were tested to failure under constant axial load and cyclic lateral load. The influences of reinforcement ratio, configuration of shear hoop rings, and axial load ratio on the seismic performance of ARCFCs are experimentally investigated. The failure mode of all the specimens is characterized by bending, and no tube local buckling was observed in the tested specimens except for the embedded connection. Experimental results show that all the specimens have good ductility with ductility coefficients larger than 4.5. Analysis is conducted to investigate the influence of test parameters on the load-displacement skeleton curves, stiffness degradation, energy dissipation capacity, and strain development of steel tube and anchor rebars. Analysis results reveal that the seismic performance of the proposed connection is similar to the embedded connection when it is designed according to both the “compression equivalence” and “bending equivalence” principles. Based on the test results, a calculation method for the sectional strength of the bottom section is suggested and verified.
AB - The anchor rebar column-foundation connection (ARCFC) is proposed for concrete filled steel tube (CFST) column to simplify the construction process of column-foundation connection. In this paper, a total of eight specimens were tested to failure under constant axial load and cyclic lateral load. The influences of reinforcement ratio, configuration of shear hoop rings, and axial load ratio on the seismic performance of ARCFCs are experimentally investigated. The failure mode of all the specimens is characterized by bending, and no tube local buckling was observed in the tested specimens except for the embedded connection. Experimental results show that all the specimens have good ductility with ductility coefficients larger than 4.5. Analysis is conducted to investigate the influence of test parameters on the load-displacement skeleton curves, stiffness degradation, energy dissipation capacity, and strain development of steel tube and anchor rebars. Analysis results reveal that the seismic performance of the proposed connection is similar to the embedded connection when it is designed according to both the “compression equivalence” and “bending equivalence” principles. Based on the test results, a calculation method for the sectional strength of the bottom section is suggested and verified.
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U2 - 10.1016/j.jcsr.2020.106269
DO - 10.1016/j.jcsr.2020.106269
M3 - Article
AN - SCOPUS:85088817065
VL - 173
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
SN - 0143-974X
M1 - 106269
ER -