摘要
综述了国内外有关CFRP加固钢管混凝土结构的技术与应用的最新进展,对CFRP钢管混凝土的结构组成、受力机理进行了理论分析。利用CFRP抗拉强度高和便于施工操作等优点在既有钢筋、钢管混凝土、钢结构的维修加固方面的广阔应用前景,采用双剪统一强度理论,考虑中间主应力以及CFRP筒对内层钢管混凝土的环向紧箍作用,在厚壁圆筒的统一强度理论解基础上,推导出了CFRP加固钢管混凝土轴压短柱的极限承载力计算公式。与相关文献资料的试验结果进行了比较,吻合较好,验证了理论公式的正确性和可行性,并且该公式可以退化为圆钢管混凝土轴压短柱极限承载力的表达式,从而进一步验证了统一强度理论对CFRP加固钢管混凝土轴压短柱承载力计算的适用性。该结果为CFRP加固钢管混凝土轴压承载力分析提供了一定的理论依据,对理论研究和工程设计有一定的参考价值。
New progress of research and applications of CFRP at home and abroad are introdnced in this paper. The circular concrete-filled tubular CFRP-steel stub column under axial loads is studied based on the unified strength theory in the paper. The effect of intermediate principal stress on the ultimate strength for the concrete-filled tubular CFRP-steel stub column are investigated. The ultimate load calculation formula for the concrete-filled tubular CFRP-steel stub column is derived, and can be simplified for cases without CFRP. Compared with the solution obtained in this paper and the experimental results, the good agreement can be found. The effects of the intermediate shear stress, the cross-section deformation ratio and also the inner friction angle of the concrete are all considered in the theory analysis. The applicability of the unified strength theory in the field of concrete-filled CFRP-steel tube are further tested by the analysis results. It has an important theory value for engineering application.
出处
《工程抗震与加固改造》
北大核心
2009年第4期66-70,共5页
Earthquake Resistant Engineering and Retrofitting
