加筋高性能砂浆加固RC梁抗剪性能及承载力计算  

Shear behavior and bearing capacity calculation of RC beams strengthened with high performance ferrocement laminate

作　　者：黄华[1,2] 杨琪[3] 郑益斌[1] 刘伯权[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 [3]科学出版社南京分社,江苏南京210029

出　　处：《长安大学学报（自然科学版）》2015年第1期76-83,共8页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51308065);高等学校博士学科点专项科研基金项目优先发展计划(20130205130001);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;2014T70896);中央高校基本科研业务费专项资金项目(2014G2280014)

摘　　要：为统一中国对加筋高性能砂浆加固RC梁抗剪性能的认识,以中国所做66根加筋高性能砂浆加固的钢筋混凝土矩形梁抗剪性能试验研究为基础,分析抗剪加固梁的力学性能和破坏机理;借助桁架-拱模型,考虑一次受力、二次受力、持载程度、加固筋类型、加固筋数量、混凝土强度等级等因素影响,建立加固梁抗剪承载力计算公式。研究结果表明:该加固技术采用高强钢绞线、钢筋网、钢丝网作为受力材料,虽然三者受力性能存在显著差异,但构件力学性能和破坏机理相似,按统一计算公式进行承载力设计是可行的;所提公式计算值与试验值之比的平均值为0.926,标准差为0.178,二者符合良好,且计算结果偏于安全,公式可用于实际工程计算。For achieving a consensus on the shear performance of RC beams strengthened with high performance ferrocement laminate,this paper was based on the inland experimental study on 66 RC beams strengthened with high performance ferrocement laminate to analyze the shear behavior and failure mechanism of these strengthened beams.Based on truss-arch model and considering the influence of first load,secondary load,the magnitude of sustained load,quantity and style of the reinforcement,and concrete strength,this paper established the uniform formula of strengthened beam shearing capacity.The results show that the shear behavior and failure mechanism of these beams strengthened with the reinforcement are similar though they used different reinforcement materials including high strength stainless steel wire mesh,reinforcing steel bars,and steel wire mesh and their mechanical performance has significant difference.Building the uniform formula to calculate the shearing capacity of these strengthened beams is theoretically feasible.The average ratio between the calculating values of the uniform formula and test results of the shearing capacity is 0.926,and the standard error is 0.178.So the calculating values are more secure,and the calculation method can be used in the design of reconstruction engineering.

关 键 词：桥梁工程 加筋高性能砂浆 加固 钢筋混凝土梁 抗剪性能 桁架-拱模型 承载力计算 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU375.1[交通运输工程—道路与铁道工程]