Experimental research on concrete-filled RPC tubes under axial compression load
Experimental research on concrete-filled RPC tubes under axial compression load
复制标题
RPC管混凝土轴压试验研究
DOI：
10.1016/j.engstruct.2017.11.012
复制
发表时间：
2018-01-15
影响因子：
5.5
通讯作者：
Luo, Xiao-Bing
中科院分区：
文献类型：
--
作者：
Shan, Bo;Lai, Da-De;Luo, Xiao-Bing
提出了一种新型复合柱--活性粉末混凝土管混凝土柱。在这种混合体系中，在预制的RPC管中布置高强度螺旋箍，然后在RPC管中浇筑混凝土。除了作为模板，RPC管还可以提供良好的刚度，并可以直接承载相当大的轴向荷载，这归因于其超高的抗压强度。此外，RPC管中的高强度箍为内部混凝土提供了横向约束。为了研究RPC管与内部混凝土之间的复合效应，进行了27根大型柱的轴压试验。结果表明，CFRPCT柱的轴向承载能力比箍约束柱和空心RPC管的总承载能力高约6.0%。CFRPCT系统有效地结合了RPC的高强度和箍约束。基于试验结果和对现有模型的修正，提出了CFRPCT柱轴向承载能力的约束模型，并与试验结果进行了验证。该CFRPCT体系提供了一种水泥基复合柱，具有较高的抗压性能、良好的耐久性和耐腐蚀性。
An innovative composite column, named concrete-filled RPC (reactive powder concrete) tube (CFRPCT), is presented in the paper. In this hybrid system, high-strength spiral hoops are arranged in the prefabricated RPC tube and then concrete is poured in the RPC tube. Besides serving as formwork, the RPC tube can provide excellent stiffness and can directly carry considerable axial load attributed to its ultra-high compressive strength. Moreover, high-strength hoops in the RPC tube provide lateral confinement for the inner concrete. A total of 27 large-scale columns were tested under axial compression load, to investigate the composite effect between RPC tube and inner concrete. The results show that axial load carrying capacity of the CFRPCT columns is about 6.0% higher than the total capacity corresponding to the hoop-confined column and the hollow RPC tube. The CFRPCT system effectively combines the high strength of RPC and hoop confinement. Based on experimental findings and modified existing model, a confinement model was proposed to predict the axial load carrying capacity of CFRPCT columns and it was also validated with experimental results. This CFRPCT system provides a type of cement-based composite column, which owns high compressive performance, excellent durability and corrosion resistance.