Abstract
In order to quantitatively evaluate the shear-bearing capacity of shear connectors of square concrete filled steel tube (CFST), push-out tests on 14 square CFSTs with shear connectors have been carried out. Among the 14 CFSTs, there are 13 specimens with steel plate connectors and one specimen with steel bar connectors. The following factors are investigated to figure out their influences on the performance of CFSTs, which are the width to thickness ratio of steel tube, thickness of steel plate, length of steel plate, strength of concrete, welding condition of steel plate, number of steel plate layer and interlayer spacing. The test results show that the ultimate bearing capacity and the elastic stiffness increase with decreasing width to thickness ratio of the steel tube, and increasing thickness and length of the steel plate. With increasing concrete strength, the ultimate bearing capacity also increases. However, the welding condition has no effect on the ultimate bearing capacity. The ultimate bearing capacity of the CFST with double-layer steel plate is greater than that with single-layer steel plate. The ultimate bearing capacity of steel bar type shear connector is 87% greater than that of the steel plate type shear connector, and the steel bar specimen shows good ductility. A formula for calculating the shear-bearing capacity of shear connectors has been developed, and the calculated shear-bearing capacities are in good agreement with the test data.
Highlights
In common structural designs, concrete filled steel tube (CFST) members have been widely used as piles, building columns and bridge piers
Han [2] studied the effect of the constraining factor and width to thickness ratio of a steel tube on the compressive load capacity of concrete filled rectangular hollow section (CFRHS) and the ductility of the steel tube
The results showed that for high-strength CFST columns, the peak load was achieved for small shortening (3.0 mm), whereas for normal concrete the ultimate load was gained with large displacement
Summary
Concrete filled steel tube (CFST) members have been widely used as piles, building columns and bridge piers. This is due to the advantages of the composite members, such as high strength, good ductility, high energy absorption capacity, and ease of construction. Performed an experimental study on the behavior of square CFST stub columns with different diameter to thickness ratios (D/t). Han [2] studied the effect of the constraining factor and width to thickness ratio of a steel tube on the compressive load capacity of concrete filled rectangular hollow section (CFRHS) and the ductility of the steel tube
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