轻质超高性能混凝土(LUHPC)短柱轴心受压试验

Experimental Study on Axial Compression of Lightweight Ultra-high Performance Concrete Short Column

为明确轻质超高性能混凝土(LUHPC)短柱轴心受压力学性能,开展了LUHPC短柱轴心受压试验。设计制作了15根LUHPC短柱和4根高强混凝土短柱试件,对比分析了LUHPC短柱的破坏机理和不同配筋率对承载力的影响,提出了LUHPC短柱轴心受压承载力的计算修正公式。结果表明:与高强混凝土短柱破坏过程不同,LUHPC短柱的破坏机理是纵向钢筋先屈服,然后混凝土应变再达到峰值,短柱发生破坏;LUHPC短柱具有更好的延性;当配筋率从0.5%增大到4.36%时,短柱承载力提高了9.61%;修正公式计算值与试验值吻合较好。

In order to elucidate the mechanical property of the axial compression of LUHPC(lightweight ultra-high performance concrete)short-column,this paper carried out tests on the axial compression of LUHPC short-column.15 LUHPC short-columns and 4 high-strength concrete short-column specimens were designed and produced to compare and analyze the failure mechanism of LUHPC short-columns and the influence of different reinforcement ratios on bearing capacity.And a modified formula for calculating the bearing capacity of LUHPC short-column under axial compression was proposed in this paper.The test results shows that:unlike the failure process of high-strength concrete short-column,the failure mechanism of LUHPC short-column is that the longitudinal reinforcement yields first,then the concrete strain reaches the peak and the short-column breaks;the LUHPC short-column has better ductility;when the reinforcement ratio was increased from 0.5%to 4.36%,the short-column bearing capacity increased by 9.61%;and the calculated value of the modified formula agreed well with the experimental value.