The composite beams having high-strength steel (HSS) and high-strength concrete (HSC) can fully exploit the mechanical behavior of both materials. However, the published research on the structural behavior of composite beams using HSS and HSC is limited. In order to study the influences of shear connection degree and concrete strength on the flexural performance of composite beams using HSS and HSC, four composite beam specimens were constructed and loaded under four-point bending test in the present study. The test results showed that the failure mechanism of the fully connected composite beams was the bending failure of steel beam and crushing failure of concrete slab. The failure mode of the partially connected composite beams was the shear failure of stud connectors and bending failure of steel beam. The composite beams having 65% and 162% shear connection degree achieved the load bearing capacity of 18.8% and 25.3% higher than the composite beam having 38% shear connection degree. With the shear connection degree increased, the bending bearing capacity of the composite beam was enhanced. The concrete strength had no obvious impact on the flexural capacity of the composite beam having HSS and HSC. Moreover, the analytical models were put forward to predict the flexural capacity and bending stiffness of the composite beam using HSS and HSC.
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The research was supported by National Key Research and Development Program of China (No. 2017YFC0703405) and National Natural Science Foundation of China (Nos. 51678295, 51478220). The authors also thank Associate Mrs. Tong Zhang for revising and proofreading this manuscript.
The research was supported by National Key Research and Development Program of China (No. 2017YFC0703405) and National Natural Science Foundation of China (Nos. 51678295, 51478220).
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Du, H., Hu, X., Shi, D. et al. Flexural Performance of Composite Beams Using High-Strength Steel and High-Strength Concrete. Int J Steel Struct 22, 27–41 (2022). https://doi.org/10.1007/s13296-021-00558-y