[논문]Cyclic lateral load test and finite element analysis of high-strength concrete-filled steel box columns under high axial compression

Chou, Chung-Che; Wu, Sung-Cheng

doi:10.1016/j.engstruct.2019.03.052

Cyclic lateral load test and finite element analysis of high-strength concrete-filled steel box columns under high axial compression

Engineering structures, v.189, 2019년, pp.89 - 99

Chou, Chung-Che (Department of Civil Engineering, National Taiwan University) , Wu, Sung-Cheng (Department of Civil Engineering, National Taiwan University)

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Abstract This paper presents an experimental study of the seismic performance of high-strength concrete-filled box columns (CFBCs) under combined axial and cyclic lateral loads. Specimens were made of high-strength SM 570 M steel (with yield strengths between 520 and 580 MPa), and concrete with compressive strength ( f c ' ) greater than 80 MPa. Three parameters that affect the seismic performance of CFBCs were investigated: the width-to-thickness (b/t) ratio of the steel column, magnitude of the axial load, and the addition of concrete infill. The specimens, which were 280–420 mm in width and 2000 mm in height, were tested under combined axial (4058–10,090 kN) and cyclic lateral loads. Experimental results indicated that the lateral displacement ductility decreases significantly with an increase in either the axial load or b/t ratio. The addition of concrete infill inside a hollow steel box column does not improve the lateral displacement ductility of CFBCs under high axial load. Although the CFBC specimens satisfied the b/t requirement of a highly ductile member, as per AISC Seismic Provisions (2016), specimens under high axial load (40%Pn ) failed at 4% drift, indicating that the requirement does not guarantee that CFBCs will sustain high axial load under significant drift (i.e., >3%). The Eurocode 4 (2009), AISC Specification (2010), and Architectural Institute of Japan (2014) reasonably estimate the flexural strength of high-strength CFBCs under axial load; however, ACI 318 (2011) does not. The finite element analysis program ABAQUS can be used to estimate the hysteretic behavior of specimens before significant strength degradation. Highlights High-strength concrete filled box columns (CFBCs) are investigated. Five column specimens are laterally and cyclically tested after axial compression (0.2–0.4Pn ). The addition of concrete infill inside a hollow column does not improve the ductility of CFBCs. The b/t limit of the code cannot assure good seismic behavior of CFBCs under high axial load.

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참고문헌 (26)

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Cyclic lateral load test and finite element analysis of high-strength concrete-filled steel box columns under high axial compression

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