Abstract
In this research, high strength fiber reinforced concrete (HSFRC) was used to replace the normal strength concrete (NSC) in steel-concrete composite beams to improve their working performance, which might change the static performance of stud connectors. Firstly, push-out tests were conducted to investigation on the static performance of stud connectors in steel-HSFRC composite beams and compared with steel-NSC composite beams. Studs of 8 sizes, 13 mm, 16 mm, 19 mm and 22 mm in diameter and 80 mm and 120 mm in height were adopted to study the influence of stud dimension. The test phenomenon shown that the crack resistance of HSFRC was better than that of NSC, and there were some splitting cracks on NSC slabs whereas no visible cracks on HSFRC slabs when specimens failed. Next, the load-slip curves of studs were analyzed and a typical load-slip curve was proposed which was divided into four stages. In addition, the effects of test parameters were analyzed according to the characteristic points of load-slip curve. Compared with NSC slab, HSFRC slab could provide greater restraining force to the studs, which improved the shear capacity and stiffness of studs while suppressed the ductility of studs. The shear capacity, stiffness and ductility of studs would significantly increase with the increasement of stud diameter and the studs with large diameter were more suitable for steel-HSFRC composite beams. The stud height had no obvious influence on the static performance of studs. Finally, based on the test results, the empirical formulas for load-slip curve and shear capacity of stud connectors embedded in HSFRC were developed which considered the influence factors more comprehensively and had better accuracy and applicability than previous formulas.
Highlights
In recent years, the steel-concrete composite beams have been widely used in engineering structure because of the superior performance and the better comprehensive benefits [1,2]
Majority of these studies have focused on the studs embedded in normal strength concrete (NSC), and minority of them have given the equations for the stud in HPC and ultra-high-performance concrete (UHPC)
12 push-out specimens with the test parameter of concrete type, concrete strength, stud diameter and stud height were tested to research the static performance of stud connectors in steel-NSC and steel-high strength fiber reinforced concrete (HSFRC) composite beams
Summary
The steel-concrete composite beams have been widely used in engineering structure because of the superior performance and the better comprehensive benefits [1,2]. Zhang et al [19] through tests found that compared with steel-NSC specimens, the shear capacity of the studs embedded in FRC was slightly improved, the crack resistance of FRC slab was better and the failure mode would change when the stud diameter exceeded 23 mm. He et al [20] concluded that the shear capacity and ductility of the stud connectors embedded in FRC would increase with the fiber volume fraction studied by push-out tests and finite element analysis. It is essential to study the static performance and of stud connectors embedded in HSFRC and the influence factors on it (e.g., stud diameter and height and concrete property) for increasing the understanding of steel-HSFRC composite beams. Specimen H80-16 refers to the specimen with HSFRC and studs with height of 80 mm and diameter of 16 mm
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