（1 重庆大学山地城镇建设与新技术教育部重点实验室， 重庆 400045； 2 重庆大学土木工程学院， 重庆 400045）

［摘要］鉴于工程中可能出现钢筋混凝土柱局部高度范围混凝土强度缺陷的现象，基于钢管约束混凝土概念，提出一种采用约束钢管加固局部高度缺陷区段的方法。该加固方法的特征在于通过压力灌注水泥浆使管内混凝土与钢管紧密接触，并使加固后钢管外表面与无缺陷区段柱子表面齐平。3根局部高度加固柱的轴心受压试验结果表明，该方法能有效提高柱子缺陷区段的受压承载力，并保证柱子良好的正常使用性能。试件屈服前，加固后的缺陷区段压缩刚度与无缺陷区段基本相当，但屈服后压缩变形几乎全部发生在缺陷区段。承载力分析结果表明，Mander模型计算结果与试验结果吻合良好。

［关键词］混凝土强度缺陷； 加固； 局部高度加固柱； 钢管约束混凝土

中图分类号：TU375-3文献标识码：A文章编号：1002-848X(2020)13-0064-07

Experimental study on compression bearing capacity of square section frame columns in local height range based on the concept of steel tube confined concrete

QUAN Xueyou1,2, ZHUANG Lingkai1,2, WU Dekuan1,2, HU Ying1,2, LIU Bao1,2

(1 Key Laboratory of New Technology for Construction of Cities in Mountain Area， Chongqing University， Chongqing 400045， China; 2 School of Civil Engineering， Chongqing University， Chongqing 400045， China)

Abstract:Based on the concept of steel tube confined concrete, a method of strengthening the local height defect range of column confined by steel tube was proposed in view of local height range of reinforced concrete column with concrete strength defect in projects. The strengthening method was characterized in that the concrete in the tube was closely contacted with the steel pipe through pressure grouting, and the outer surface of the steel tube after reinforcement was flush with the column surface in the defect free section. The axial compression experimental results of three locally strengthened columns show that this method can effectively improve the compression bearing capacity of the defective section of the column and ensure the good normal performance of the column. Before the specimen yield, the compression stiffness of the strengthened defective section is almost the same as that of the non-defective section, but almost all of the compression deformation occurs in the defective section. The results of bearing capacity analysis show that the calculation results of Mander model are in good agreement with the experimental results.

Keywords:concrete strength defect; strengthening; locally strengthened of column; steel tube confined concrete

作者简介：全学友，博士，教授，博士生导师，Email:quanxueyou@163.com。