【摘要】 为研究新型无格室钢-UHPC结合段的受力性能和传力机理，以主跨240 m的沅水特大桥主桥为研究背景，采用有限元分析方法建立了钢-UHPC结合段局部模型，分析了结构受力以及影响结构传力的构造参数。结果表明：在最不利正弯矩工况下，结构传力平顺，各部分应力基本满足要求；栓钉连接件剪力大小基本呈马鞍状分布，综合剪力最大达29.7 kN,具有一定的安全储备；承压板承担轴向荷载比例为82.34%,承担比例随着承压板厚度的增大有所提高；混凝土强度增大和UHPC顶/底板厚度增大均可减小栓钉连接件剪力；UHPC结合段能有效减小栓钉连接件滑移；结合段长度增大的同时不能有效发挥中间栓钉连接件抗剪作用。更多还原

【Abstract】 To investigate the mechanical performance and the force transfer mechanism of the novel steel-UHPC joints without cell, the main bridge of Yuanshui Grand Bridge with a main span of 240 m was cited as the research background. The local model of steel-UHPC joints was established by FEM, and the structural forces and the structural parameters affecting the structural force transmission were analyzed. The results show that: the structure has smooth structural force transmission and the stresses in each part basically meet the requirements even under the most unfavorable positive bending moment condition; the shear force of studs is basically distributed in saddle shape, and the maximum comprehensive shear force is up to 29.7kN, with a certain safety reserve; the proportion of axial load borne by the pressure bearing plate is about 82.34%, and the proportion of axial load borne by the pressure bearing plate increases as its thickness increases; the increase of the concrete strength and the thicknesses of the UHPC top and bottom plates can reduce the shear force of studs; the UHPC joints can effectively reduce the slip of the studs; when the length of the joints increases, the shear resistance of the middle studs cannot be effectively exerted.更多还原