复合内嵌碳纤维筋预应力螺旋肋钢筋加固混凝土梁承载力分析  

ANALYSIS FOR BENDING CAPACITY OF REFORCED CONCRETE BEAMS MULTIPLE STRENGTHENED WITH NEAR-SURFACE MOUNTEDCARBON FIBER REINFORCED PLASTIC BAR AND PRE-STRESSED HELICAL RIB BAR

作　　者：任振华[1,2] 曾宪桃[1] 周丰峻 

机构地区：[1]湖南工程学院建筑工程学院,湖南湘潭411104 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [3]总参工程兵科研四所,北京100850

出　　处：《玻璃钢／复合材料》2012年第5期33-37,共5页Fiber Reinforced Plastics/Composites

基　　金：湖南省教育厅优秀青年项目(11B033);中国工程院咨询项目(116001);湖南省科技计划项目(2010GK3198)

摘　　要：用碳纤维筋和预应力螺旋肋钢筋共同嵌入到混凝土梁受拉区保护层中对混凝土梁进行加固,能更有效地改善混凝土梁的受力性能。为更有效地分析复合内嵌碳纤维筋预应力螺旋肋钢筋加固混凝土梁的破坏形态、极限状态及正截面承载力,通过对预应力状态下梁各阶段受力情况分析、承载力计算及界限状态的判别,提出了加固混凝土梁对应不同破坏形态下承载力的计算公式。为验证所得分析结论的合理性和可靠性及计算公式的准确性,对7根碳纤维筋预应力螺旋肋钢筋加固的混凝土梁进行弯曲试验,结果表明,被加固梁的破坏形态、极限状态分析是合理的,所提出的计算公式能准确计算加固梁抗弯承载能力。RC beams can be strengthened with Carbon Fiber Reinforced Plastic(CFRP) and pre-stressed Helical Rib Bar(HRB)that are inserted into the concrete cover of tensile region in the concrete beams,which can effectively improve force performance of the beams.In order to analyze the failure form,ultimate state and normal section bearing capacity of RC beams composites strengthened with near-surface mounted carbon fiber reinforced plastic bar and pre-stressed helical rib bar,the bearing capacity equation of strengthened beams corresponding to different failure modes was supplied by analyzing force in each stage of beams in pre-stress state,bearing capacity calculating and limit state.In order to inspect and verify the rationality and the reliability of the conclusions and the veracity of the equation,the flexural experimental studies were tested on seven concrete beams strengthened with near-surface mounted carbon fiber reinforced plastic bar and pre-stressed helical rib bar.The results indicate that the failure modes and limit state of strengthened beams are reasonable,the equation can veraciously calculate the bend capacity of strengthened beams.

关 键 词：复合内嵌 碳纤维筋 预应力螺旋肋钢筋 加固 混凝土梁 承载力 

分 类 号：TB332[一般工业技术—材料科学与工程] TU375.1[建筑科学—结构工程]