外包角钢与碳纤维布复合加固钢筋混凝土偏压柱承载力计算分析

Analysis of the bearing capacity of RC eccentric compression columns encased in angle steels and strengthened with CFRP

在14根外包钢与碳纤维布复合加固钢筋混凝土偏压柱试验研究的基础上,对这一新型复合加固柱的承载力进行理论分析,提出了采用条分法和简化法两种极限承载力的计算方法来计算复合加固偏压柱正截面承载力,其理论计算结果与试验结果对比,吻合较好。同时在此基础上分析了长细比、含角钢率、含碳纤维布率和偏心距等因素对复合加固偏压柱力学性能的影响。分析结果表明:含碳纤维布率和含角钢率越大,构件长细比越小,以及荷载的偏心距越小,复合加固效果越好。本文的研究成果为该新型复合加固技术在工程中应用提供了理论依据。

Based on experimental studies of 14 RC eccentric compression columns strengthened with CFRP and encased in angle steels, theoretical analysis of the bearing capacity of the columns is conducted. Two types of methods （slice method and simple method） for bearing capacity calculation are presented, and the theoretical results conforms well with the experiment results. Also analyzed are the influences of CFRP ratio, angle steel ratio, slenderness ratio and eccentricity to the mechanical properties of the columns. The results indicate that decreases in slenderness ratio and eccentricity and increases in CFRP ratio and angle steel ratio are advantageous to the ultimate load-bearing capacity and the ductility.