Luo Jun, Quan Ziran, Shao Xudong, Li Fangyuan, He Shangwen
School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China.
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China.
Polymers (Basel). 2022 May 10;14(10):1933. doi: 10.3390/polym14101933.
This paper aims to explore the material properties of RPC and transverse-bending performance, as well as the crack-width-calculation theory of a densely reinforced steel-RPC composite structure with different fiber parameters. Two fiber types (straight fiber, hybrid fiber) and four fiber volume contents (2%, 2.5%, 3%, 3.5%) were selected to explore the mechanical properties of RPC materials, and the influences of fiber parameters on compressive strength, modulus of elasticity, flexural strength and axial tensile property were investigated. Eight steel-RPC composite plates with different design parameters (fiber type and reinforcement ratio) were conducted to study the transverse-bending performance of steel-RPC composite deck structures. The results show that the addition of 3.5% hybrid fibers to the RPC matrix leads to the optimum axial tensile and flexural properties. Furthermore, the failure mode, load-displacement curve, crack occurrence and propagation characteristics of the composite structure are analyzed in detail. Based on the experimental results, the calculation methods of reinforcement stress and crack width of densely reinforced steel-RPC composite structure are proposed. The calculated results of reinforcement stress and maximum crack width are in good agreement with the actual measured values, which can provide a reference for engineering design.
本文旨在探究活性粉末混凝土（RPC）的材料性能和抗弯性能，以及不同纤维参数的密布配筋钢-RPC组合结构的裂缝宽度计算理论。选取两种纤维类型（直纤维、混杂纤维）和四种纤维体积含量（2%、2.5%、3%、3.5%）来探究RPC材料的力学性能，并研究纤维参数对抗压强度、弹性模量、抗弯强度和轴向拉伸性能的影响。对八块具有不同设计参数（纤维类型和配筋率）的钢-RPC组合板进行试验，以研究钢-RPC组合桥面结构的抗弯性能。结果表明，在RPC基体中添加3.5%的混杂纤维可使其轴向拉伸性能和抗弯性能达到最优。此外，还详细分析了组合结构的破坏模式、荷载-位移曲线、裂缝出现及扩展特性。基于试验结果，提出了密布配筋钢-RPC组合结构的配筋应力和裂缝宽度计算方法。配筋应力和最大裂缝宽度的计算结果与实测值吻合良好，可为工程设计提供参考。
