Techno Press

Steel and Composite Structures   Volume 23, Number 4, March20 2017, pages 483-491
Experimental study on concrete-encased composite columns with separate steel sections
Congzhen Xiao, Fei Deng, Tao Chen and Zuozhou Zhao

Abstract     [Full Text]
    This paper presents an experimental study on the behavior of concrete-encased composite columns with multi-separate steel sections subjected to axial and eccentric loads. Six 1/4-scaled concrete-encased composite columns were tested under static loads. The specimens were identical in geometric dimensions and configurations, and the parameter of this experiment was the eccentricity ratio of the applied load. Each two of the specimens were loaded with 0, 10%, and 15% eccentricity ratios. The capacity, deformation pattern, and failure mode of the specimens were carefully examined. Test results indicate that full composite action between the concrete and the steel sections can be realized even though the steel sections do not connect with one another. The concrete-encased composite columns can develop stable behavior and sufficient deformation capacity by providing enough transverse reinforcing bars. Capacities of the specimens were evaluated based on both the Plain Section Assumption (PSA) method and the superimposition method. Results show that U.S. and Chinese codes can be accurate and safe in terms of bending capacities. Test results also indicate that the ACI 318 and Mirza methods give the best predictions on the flexural stiffness of this kind of composite columns.
Key Words
    static test; concrete-encased composite column; separate steel sections; capacity; stiffness
(1) Congzhen Xiao, Tao Chen:
China Academy of Building Research, 30 Beisanhuandong Lu, Beijing, China;
(2) Fei Deng, Zuozhou Zhao:
Department of Civil Engineering, Tsinghua University, 30 Shuangqing Lu, Beijing, China.

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