高强钢绞线网加固RC梁抗剪剥离承载力计算  

Calculation of Shear Debonding Capacity of RC Beams Strengthened with High Strength Steel Wire Mesh

作　　者：黄华[1,2] 刘伯权[1] 贺拴海[2] 吴涛[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学公路学院,陕西西安710064

出　　处：《中国公路学报》2013年第2期102-109,118,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51078037);教育部高等学校博士学科点专项科研基金项目(20090205120008);陕西省自然科学基础研究计划项目(2012JQ7024);中国博士后科学基金项目(2012M511956);中央高校基本科研业务费专项资金项目(CHD2012JC026;CHD2011JC132;CHD2010JC082)

摘　　要：为研究高强钢绞线网加固的RC梁抗剪剥离承载力,对9根抗剪加固梁进行试验测试,并进行数值分析,研究了加固方式、原梁配箍率、混凝土强度、剪跨比、钢绞线用量、二次受力等因素对剥离破坏承载力的影响,并建立了抗剪加固剥离承载力计算公式。研究结果表明:持载加固构件的剥离承载力不一定低于完整加固构件,但持载程度增加,剥离承载力降低;随混凝土强度和原梁配箍率提高,剥离承载力提高,但提高幅度有限;不同加固方式的加固构件,其剥离承载力均随钢绞线直径的增大而提高,且提高幅度逐渐降低;随剪跨比增大,剥离承载力降低;所建抗剪加固剥离承载力公式计算值与试验值之比的平均值为1.006,计算结果与试验结果符合良好,公式可用于快速评估抗剪加固梁剥离承载力。To study the shear debonding capacity of RC beams strengthened with high strength steel wire mesh, 9 strengthened RC beams were tested and analyzed numerically. The influence of strengthening mode, reinforcement ratio, concrete strength, shear span ratio, quantity of stainless steel wire and secondary load on the shear debonding capacity was investigated respectively. And the formulae for the shear debonding strength were deduced. The results show that the shear debonding capacity of sustained load members is not always lower than that uninjured, but the debonding capacity decreases as the sustained load increases; with the increase of concrete strength and reinforcement ratio, the shear debonding capacity can be improved, but the increasing range is limited; regardless of the strengthening mode, the shear debonding capacity increases with the increase of the diameter of the strength steel wire mesh, but the potential for further improvement declines; the shear debonding capacity decreases as the shear span ratio increases; and the average ratio between the calculated values of the sheardebond- ing strength and test values is 1. 006, so they are in good accordance. The formulae of the sheardebonding strength can be used to evaluate the debonding capacity of the shear strengthened RC beams quickly.

关 键 词：桥梁工程 RC梁 试验研究 高强钢铰线网 剥离破坏 有限元分析 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]