加筋高性能砂浆加固RC梁抗剪性能及承载力计算

发布时间：2018-03-26 15:00

本文选题：桥梁工程　切入点：加筋高性能砂浆　出处：《长安大学学报(自然科学版)》2015年01期

【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。
[Abstract]:In order to unify China's understanding of the shear behavior of RC beams strengthened with reinforced high performance mortar, the shear behavior of 66 reinforced concrete rectangular beams strengthened with reinforced high performance mortar was studied in China. The mechanical properties and failure mechanism of shear strengthened beams are analyzed, and the factors such as primary force, secondary force, holding capacity, reinforcement type, number of reinforcement bars and concrete strength grade are considered by truss-arch model. The calculation formula of shear bearing capacity of strengthened beams is established. The results show that the strengthening technique uses high strength steel strands, steel mesh and wire mesh as mechanical materials, although there are significant differences in their mechanical properties. But the mechanical properties and failure mechanism of the members are similar, it is feasible to design the bearing capacity according to the unified calculation formula, the average value of the calculated value to the test value is 0.926, the standard deviation is 0.178, the two are in good agreement, and the calculation results are more safety. The formula can be used in practical engineering calculation.
【作者单位】：长安大学建筑工程学院;长安大学公路学院;科学出版社南京分社;
【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)
【分类号】：U441;U445.72

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