Experimental study on flexural behavior of large-scale prestressed UHPC T-shaped beam
Li Lifeng1,2 Fan Xin1 Shi Xiongwei3 Shao Xudong1,2
1. Hunan University, Changsha 410082, China;
2. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Changsha 410082, China;
3. Xi’an Highway Institute of the Shaanxi Province, Xi’an 710065, China
Abstract：To study the mechanical property and structure design method of the ultra-high performance concrete (UHPC), a large-scale prestressed T-shaped beam was tested and intermediate and final behaviors, such as cracking loads, flexural stiffness and moment capacity, were obtained. The calculation method for the cracking loads and ultimate bending moment was improved by considering the tensile constitutive relationship and the adjustment of the tensile softening of UHPC. Furthermore, the nonlinear analysis based on the structural parameters, including reinforcement ratio, tension force and depth-span ratio, was conducted. The predicted results based on the calculation program agree well with the tested ones. It is concluded that the prestressed UHPC beam possesses good ductility and deformation capacity. The calculation of the cracking moment for prestressed UHPC beam can refer to the JTG D62-2004 Code. The tensile behavior contributes little to the ultimate bending capacity. The flexural behavior, especially the ultimate bending capacity, can be effectively improved by increasing the area of tendon to take full advantage of the ultra-high compressive strength of UHPC.
