活性粉末混凝土包裹型钢柱轴压性能分析

Analysis of axial compression performance of reactive powder concrete wrapped steel column

为研究活性粉末混凝土(reactive powder concrete,RPC)包裹型钢柱轴压力学性能,完成了5个尺寸为350mm×300 mm×3 000 mm足尺柱试件的轴压试验,观察构件破坏损伤变化过程、测量轴向压缩位移及极限承载力。试验结果表明,柱受荷过程中未出现RPC与型钢剥离现象,2种材料协同工作性能良好,各自强度均可充分发挥,最终破坏为柱端部劈裂破坏。柱的极限承载力随RPC强度的提高及含钢量的增大而提高,RPC强度提高承载力幅度约为含钢量的5~6倍。基于试验结果和规范标准,考虑箍筋和型钢对核心区RPC的约束效应,提出该足尺柱轴向承载力计算公式,可为工程设计提供参考。

To study the axial compressive properties of reactive powder concrete(RPC) wrapped steel column,the axial compression tests of five full-scale columns with dimensions of 350 mm×300 mm×3 000 mm were completed to observe the damage process of components, and to measure the axial compression displacement and ultimate bearing capacity. The test results show that there is no peeling phenomenon between RPC and section steel during the column loading process, and they work well together. Both strengths can be fully exerted, and the final failure is split failure at the end of the column. The ultimate bearing capacity of the column increases with the increase of the strength of RPC and the increase of the steel content. The increase in the strength of RPC is about 5-6 times of the steel content. Based on the test results and standards, and considering the restraint effect of stirrups and section steel on the RPC in the core area, a calculation formula for the axial bearing capacity of the full-scale column is proposed to provide a reference for engineering design.