HPFL加固受火RC柱正截面承载力研究

Study on the normal section bearing capacity of RC column strengthened with HPFL after fire

基于国内外对火灾后钢筋混凝土的力学性能的研究,结合混凝土三轴受压强度理论,以平截面假定为基础,不考虑被加固柱混凝土与高性能复合砂浆钢筋网(HPFL)之间的黏结滑移,忽略被加固柱箍筋的约束作用,提出计算模型。对HPFL加固受火RC柱的正截面承载力进行理论推导,并以实验数据和工程实例验证推导出的理论公式的合理性。分析结果表明,推导出的理论公式与实验数据符合较好,采用HPFL加固受火后的钢筋混凝土柱可明显提高其正截面承载力,满足实际工程要求。

Based on the domestic and foreign research on the mechanical properties of reinforced concrete(RC) after fire,this paper combined the triaxial compression strength theory of concrete with the assumption of flat sec-tion,neglected the bond-slip between the concrete of column strengthened and the high performance ferroce-ment laminate(HPFL)as well as the restraint effect of stirrup in reinforced column,and then proposed a calcula-tion model.The theoretical derivation of the normal section bearing capacity of RC column strengthened by HPFL after fire was presented,and the rationality of the theoretical formula was verified with experiment data and engi-neering examples.The analysis results show that the theoretical formula yield results that agree well with the ex-perimental data,and that strengthening the reinforced concrete column after fire by HPFL could improve its bear-ing capacity of normal section significantly,thus meeting the practical engineering requirements.