SGFRP 加固轴心受压混凝土方柱的承载力试验研究

EXPERIMENTAL STUDY OF THE BEARING CAPACITY OF CONCRETE SQUARE COLUMN STRENGTHENED WITH SGFRP UNDER AXIAL LOAD

对8根采用高性能玻璃纤维复合材料(SGFRP)包裹加固的混凝土方柱进行轴心抗压试验,研究柱加固前的轴压比和 SGFRP 的粘贴层数对加固柱极限承载力的影响程度及其破坏形态试验表明,SGFRP 可以有效地提高混凝土方柱的极限承载力,并有效改善加固柱裂缝分布的均匀性,延缓裂缝的发展。粘贴一层 SGFRP 时加固柱的极限承载力提高近40%,粘贴两、三层时的提高幅度均约50% 同在粘贴一层的情况下,无轴压力时加固可提高极限承载力37%,轴压比为0.8时提高9%,轴压比1.1时无加固效果。

Axial load compression experiment was conducted on 8 concrete square columns strengthened with wrapping of SGFRP(Super Glass Fiber Reinforced Polymers),aiming at recognition of the axial compression ratio of the column prior to being wrapped and the effect to what extent of the plies of SGFRP on the ultimate bearingcapacity of the columns as well as their failure modes.Results showed that SGFRP could effectively improve the ultimate bearing capacity of concrete square columns,be helpful to even distribution of column cracks and delay the cracks development.The ultimate bearing capacity can be increased by approximately 40% for the columns wrapped with one ply,and 50% with 2 or 3 plies. With one ply,the bearing capacity can be improved by 37% for columns free of axial compression,9% at axial compression ratio below 0.8,and no improvement at the ratio being 1.1.