CFRP加固受损钢管混凝土轴压柱试验研究  

Study on Mechanical Properties of Damaged Axially Loaded Concrete Filled Steel Tube Columns Strengthened with CFRP Composite Materials

作　　者：顾威[1,2] 李宏男[2] 孙国帅[2] 

机构地区：[1]辽宁省交通高等专科学校公路工程质量检测中心,辽宁沈阳110122 [2]大连理工大学建设工程学部,辽宁大连116026

出　　处：《建筑材料学报》2013年第1期138-142,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50408032);辽宁省自然科学基金资助项目(20081074)

摘　　要：采用4个受损轴压钢管混凝土柱试件和4个用碳纤维复合材料(carbon fiber reinforcedplastics,CFRP)加固的受损轴压钢管混凝土试件进行对比试验研究,分析两者的受力机理,评价CFRP加固受损轴压钢管混凝土承载力提高效果.结果表明:由于CFRP的环向约束,受损钢管混凝土的钢管和核心混凝土的径向变形受到了限制,受损钢管混凝土轴压承载力有不同程度提高,且其提高效果随着长细比的增加而变小;提出了加固前后受损钢管混凝土承载力计算方法,其计算结果与试验结果吻合良好.Four damaged concrete filled steel tube columns strengthened with carbon fiber reinforced plas- tics（CFRP） and four contrast columns were tested. All specimens were notched in the central zone to sim- ulate the loss of section due to corrosion. All specimens were axially loaded while strain and displacement were measured to demonstrate the effectiveness of this repair concept. Influences of the CFRP confinement and the aspect ratio on the load bearing capacity of the columns are analyzed. The test results show that within the scope of the test, CFRP would enhance the load bearing capacity of the damaged concentrically compressed concrete filled steel tube columns effectively; the increase rate of load bearing capacity due to CFRP decreases with the increase of aspect ratio. A calculating method is also presented, capable of pre- dicting the axial load strength of concrete filled CFRP steel tube members. Experimental results are in good agreement with the predicted values.

关 键 词：钢管混凝土 碳纤维复合材料 混凝土本构关系 约束系数 轴压柱 

分 类 号：TU393[建筑科学—结构工程]