钢纤维掺量对超高性能混凝土轴压力学性能影响研究OA北大核心CSTPCD

To reveal the influence of steel fiber content on the axial compressive properties of ultra-high performance concrete(UHPC),UHPC axial compression tests were conducted with steel fiber content as the control variable and constitutive simulations were conducted.The research show that the stress-strain curve of UHPC under compression consists of an ascending segment and a descending segment.After adding steel fibers,the descending section of the stress-strain curve of UHPC under compression becomes slower.With the increase of steel fiber content,the compressive elastic modulus,peak stress,and peak strain of UHPC all show a decreasing trend.Assuming that the UHPC compression damage area follows a Weibull random distribution,a damage variable is constructed,and a damage correction factor is introduced.A new UHPC compression damage model considering different steel fiber contents is established,and the development law of damage variables is analyzed.The reliability of the new model is verified using UHPC axial compression test data.The research results provide reference for the study of axial compressive properties and constitutive simulation of UHPC under different steel fiber contents.