高强钢绞线网加固RC梁抗剪性能的数值分析  

Numerical Analysis on Shear Performance of RC Beam Strengthened with High Strength Stainless 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：《公路交通科技》2012年第9期50-57,共8页Journal of Highway and Transportation Research and Development

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);中央高校基本科研业务费专项资金项目(CHD2012JC026);陕西省自然科学基金项目(2012JQ7024);中国博士后科学基金项目(2012M511956)

摘　　要：在对高强不锈钢绞线网-渗透性聚合物砂浆加固的矩形钢筋混凝土梁抗剪试验研究基础上,采用有限元程序对其进行数值分析,研究混凝土强度、原梁配箍率、钢绞线用量、加固方式、剪跨比等因素对加固性能的影响,分析表明:随混凝土强度和配箍率提高,加固梁极限荷载及挠度均增大,且部分构件出现明显的弯曲破坏特征;随钢绞线用量增加,加固层刚度增大,剥离破坏更早出现,钢绞线利用率降低,且构件的延性变差;与U形加固相比,环包加固方式延迟了剥离破坏的发生,对改善抗剪加固性能有很大作用;随剪跨比增大,主拉应力对破坏的贡献增大,抗剪承载力和刚度逐步降低,极限挠度减小。Based on experiments conducted to investigate the shear behavior of strengthened rectangular RC beams with stainless steel wire mesh and permeability polymer mortar, the finite element method was used to analyzed the shear behavior of the strengthened beams. The influence of shear concrete strength, stirrup ratio, quantity of stainless steel wire, strengthening mode and shear-span ratio on reinforcing performance were discussed. The result shows that （1） with the increasing of concrete strength and stirrup ratio, the ultimate bearing capacity and deflection of the strengthened beam increased, and some components appeared bending failure character; （2） with the increasing of the amount of stainless steel wire, the stiffness of reinforced layer increased, and its debonding failure occurred earlier, so the utilization rate of stainless steel wire decreased and the beams＇ ductility degraded; （3） compared with U-type strengthening, the strengthening manner of wrap around delayed the appearing of debonding failure, which can improve the shear behavior; （4） with the increasing of shear-span ratio, the contribution of principal tensile stress to the beam＇s failure increased, the ultimate bearing capacity, stiffness and ultimate deflection of the strengthened beam all decreased.

关 键 词：桥梁工程 高强钢绞线网 数值分析 抗剪性能 聚合物砂浆 加固 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]