Abstract
This study mainly presented a pseudo-static experiment on two full-scale square CFST short columns with the cross-sectional width of 600 mm under combined constant axial load and cyclic lateral load. The seismic performance of the two full-scale CFST columns were investigated. Meanwhile, the plastic hinge length of the specimens was discussed. The test results presented that the specimens suffered bend-shear failure. The local buckling of steel tube occurred at the end of the specimens and the core concrete crushed. The safety redundancy of lateral bearing capacity decreased in full-scale specimen. By the method of physical observation, the plastic hinge length Lp1 was determined mainly according to the range of the local buckling of steel tube. There had a great difference between the prediction of plastic hinge lengths by the existing calculation model and the plastic hinge lengths obtained by the test.
Highlights
Concrete filled steel tubular (CFST) columns have been increasingly adopted in bridges and high-rise buildings in high intensity earthquake areas due to high strength, convenient construction, and excellent anti-seismic performance [1,2,3,4,5,6]
Pseudo-static tests are usually adopted to investigate the seismic behavior of CFST columns, that is, a constant axial load and lateral cyclic load are applied to columns simultaneously [10]
The seismic performance of two full-scale square CFST stocky columns was investigate with a combination by the constant axial load and the lateral cyclic load
Summary
Concrete filled steel tubular (CFST) columns have been increasingly adopted in bridges and high-rise buildings in high intensity earthquake areas due to high strength, convenient construction, and excellent anti-seismic performance [1,2,3,4,5,6]. Pseudo-static tests are usually adopted to investigate the seismic behavior of CFST columns, that is, a constant axial load and lateral cyclic load are applied to columns simultaneously [10]. Experimental studies on square CFST columns under a combination of axial load and cyclic lateral loads have been conducted by many researches [11,12,13,14,15]. The seismic performance of square CFST stocky columns may be different in the large section dimension. Based on the above research, it is necessary to study the seismic behavior and plastic hinge length of full-scale square columns stocky columns. An experimental test of two full-scale square CFST stocky columns was conducted to subject to seismic behavior and plastic hinge length.
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