TY - JOUR
T1 - Experimental Study on the Behavior of a Novel Stiffened Hexagonal CFDST Stub Column under Axial Load
AU - Shen, Le
AU - Yang, Bo
AU - Ding, Miao
AU - Feng, Chen
AU - Alqawzai, Shagea
AU - Elchalakani, Mohamed
AU - Chen, Kang
N1 - Funding Information:
The authors would like to gratefully acknowledge the support for this research provided by the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2019EEEVL0303), the National Natural Science Foundation of China (No. 52078079), and the Chongqing Talents Plan for Young Talents (No. CQYC201905055).
Publisher Copyright:
© 2021 American Society of Civil Engineers.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - A concrete-filled double skin tube (CFDST) consists of an outer steel tube, an inner steel tube, and the space between them filled with concrete. Existing studies have shown that the buckling of steel tubes can be significant in noncircular CFDST for nonuniform confinement or a large width-thickness ratio. Stiffening of the steel tubes is necessary to fully utilize the strength and improve the load-carrying capacity of CFDST. Against this background, the author proposed a novel stiffened hexagonal CFDST column with steel strips welded on both the inner tube and outer tube to form several closed cavities. This paper presents an experimental study on the axial compressive behavior of this new type of CFDST column. The experimental program consisted of five stiffened hexagonal CFDST specimens and two reference specimens for comparison, and the test variables were the hollow ratio and rib width. The test results showed that the ultimate bearing capacity and ductility of the CFDST specimens were greatly enhanced by the steel strips and ribs. Moreover, the finite-element (FE) method was used to develop a three-dimensional model of the CFDST column subjected to axial loading and validated against the experiment. The average error of the FE analysis when predicting the column bearing capacity was 0.029 compared with experimental results. Based on the FE model, a parametric study was conducted to analyze further the effect of each parameter on the axial behavior. Furthermore, a strength design formula was developed to estimate the compressive strength of the novel hexagonal CFDST column.
AB - A concrete-filled double skin tube (CFDST) consists of an outer steel tube, an inner steel tube, and the space between them filled with concrete. Existing studies have shown that the buckling of steel tubes can be significant in noncircular CFDST for nonuniform confinement or a large width-thickness ratio. Stiffening of the steel tubes is necessary to fully utilize the strength and improve the load-carrying capacity of CFDST. Against this background, the author proposed a novel stiffened hexagonal CFDST column with steel strips welded on both the inner tube and outer tube to form several closed cavities. This paper presents an experimental study on the axial compressive behavior of this new type of CFDST column. The experimental program consisted of five stiffened hexagonal CFDST specimens and two reference specimens for comparison, and the test variables were the hollow ratio and rib width. The test results showed that the ultimate bearing capacity and ductility of the CFDST specimens were greatly enhanced by the steel strips and ribs. Moreover, the finite-element (FE) method was used to develop a three-dimensional model of the CFDST column subjected to axial loading and validated against the experiment. The average error of the FE analysis when predicting the column bearing capacity was 0.029 compared with experimental results. Based on the FE model, a parametric study was conducted to analyze further the effect of each parameter on the axial behavior. Furthermore, a strength design formula was developed to estimate the compressive strength of the novel hexagonal CFDST column.
KW - Axial compression
KW - Compressive strength
KW - Design formula
KW - Finite-element (FE) analysis
KW - Hexagonal concrete-filled double skin tube (CFDST)
UR - http://www.scopus.com/inward/record.url?scp=85117852557&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)ST.1943-541X.0003198
DO - 10.1061/(ASCE)ST.1943-541X.0003198
M3 - Article
AN - SCOPUS:85117852557
SN - 0733-9445
VL - 148
JO - Journal of Structural Engineering (United States)
JF - Journal of Structural Engineering (United States)
IS - 1
M1 - 04021231
ER -