Abstract
A novel lightweight, high-strength and economical hot rolled shape steel (HRSS)-ultrahigh performance concrete (UHPC) composite beam is proposed for short- and medium-span composite bridges. Compared with traditional steel-concrete composite bridges, the new composite bridge has lower self-weight, better economic efficiency, and more constructional feasibility. The flexural and shear behaviors of the HRSS-UHPC composite beam were investigated through four-point bending tests on two scaled (1:2) specimens. The influence of shear-to-span ratio on the behaviors of the HRSS-UHPC composite specimens was revealed, including the failure mode, the crack distribution pattern, the propagating angle of diagonal shear cracks, and the development of crack width. The experimental results showed that the failure mode of the specimens, as well as the morphology of cracks and crack distribution, were strongly dependent on the shear-to-span ratio. In addition, the results of finite element analysis (FEA) and theoretical calculation also demonstrated that the bending and shear resistances of the proposed HRSS-UHPC composite bridge could meet the design requirements of Eurocode [1] at the ultimate limit states (ULS) and the serviceability limit states (SLS). In addition, the influence of concentrated load caused by heavy vehicle on the response of the designed composite bridge at ULS and SLS is also discussed. The calculation results of FE model show that the location of vehicle load (i.e. shear-to-span ratio) has a significant impact on the deformation of the designed composite bridge, internal force of cross section and stress of UHPC web.
Published Version
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