高强钢绞线网/ECC加固RC柱小偏心受压性能研究

Compressive Behavior of RC Columns Strengthened by High-Strength Steel Stranded Wire Meshes/ECC under Small Eccentric Compression

为研究高强钢绞线网/ECC(HSME)加固钢筋混凝土(RC)小偏心受压柱的正截面受力性能,对HSME加固RC柱、ECC加固RC柱和未加固RC柱进行了小偏心受压性能试验.结果表明:采用HSME加固后RC柱的整体性能得到显著提升,当采用相同的相对初始偏心距时,与未加固RC柱相比,HSME加固RC柱的开裂荷载、峰值荷载和延性分别提高了100.0%~113.3%、99.8%~108.0%、75.9%~77.8%;相同荷载下,HSME加固RC柱的ECC应变和纵筋压应变均小于ECC加固RC柱,HSME的加固效果更优;HSME加固层为核心混凝土提供了有效约束,改善了RC柱的损伤分布和破坏模式,显著提高了RC柱的承载力和延性;整个受压过程中,HSME加固层与RC柱混凝土协调变形,共同工作性能良好.

In order to investigate the mechanical behavior of normal cross-section of reinforced concrete(RC)columns strengthened by high-strength steel stranded wire meshes/ECC(HSME)under small eccentric compression,HSME strengthened RC columns,ECC strengthened RC column and unstrengthened RC column were prepared and tested under small eccentric compression.Results show that the overall performance of RC columns strengthened by HSME is improved significantly.Compared with the unstrengthened RC column,the cracking load,peaking load and ductility are increased by 100.0%-113.3%,99.8%-108.0%and 75.9%-77.8%respectively.Under the same load,both the strain of ECC and the compressive strain of longitudinal reinforcement of HSME strengthened RC columns are smaller than those of ECC strengthened RC column.By contrast,RC columns strengthened by HSME have obvious advantages over the ECC strengthened RC column.Furthermore,the core concrete is effectively confined by the HSME reinforcement layer,which improves the damage distribution and failure pattern of RC columns and results in the significant improvements of the load-carrying capacity and ductility.During the whole loading process,the deformations of HSME reinforcement layer and original RC column concrete are coordinated and the cooperative working performance of them is satisfactory.