复合砂浆钢筋网加固短梁抗剪承载力计算方法  

Shear Strength Calculation Method of Concrete Short Beams Strengthened by Ferrocement with Composite Mortar

作　　者：毋晨 方圣恩[1] 吴应雄[1] 陈富强 陈思辉 刘龙龙[4] WU Chen;FANG Sheng'en;WU Yingxiong;CHEN Fuqiang;CHEN Sihui;LIU Longlong(School of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Fujian Construction Engineering Group Co.,Ltd.,Fuzhou,Fujian 350001,China;Fujian Zhuyue Coostruction Group Co.,Ltd.,Fuzhou,Fujian 350001,China;China Construction Second Engineering Bureau Ltd.,Beijing 101149,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建建工集团有限责任公司,福建福州350001 [3]福建卓越建设集团有限公司,福建福州350001 [4]中国建筑第二工程局有限公司,北京101149

出　　处：《水利与建筑工程学报》2023年第4期154-159,共6页Journal of Water Resources and Architectural Engineering

基　　金：福州市科技计划项目(2021-Y-084);中建二局科技资助(2022QN120002)。

摘　　要：复合砂浆钢筋网加固法性能良好、施工简单且成本较低,但当前缺少该法加固钢筋混凝土短梁的抗剪承载力计算方法。为此,在修正拉-压杆理论基础上考虑受拉纵筋和抗剪分布钢筋对加固短梁的影响,提出采用短梁的受压区高度作为上部节点高度,根据Kupfer-Gerstle破坏准则建立了水泥砂浆钢筋网加固短梁的计算模型,进而推导了加固短梁抗剪计算公式。通过已有文献16根加固短梁的试验结果验证,表明所推导的抗剪承载力公式计算结果与试验结果吻合良好,说明该公式可以较可靠地预测复合砂浆钢筋网加固简支短梁的实际抗剪承载力,可为相关的工程计算提供参考。The strengthening technology using ferrocement with composite mortar has its merits of high performance,easy to handle and relatively low strengthening costs.However,the calculation method has not been proposed for predicting the shear capacities of short beams strengthened by ferrocement.Considering the effects of longitudinal tensional bars and shear distribution reinforcement on the strengthened beams,this paper attempts to deduce the shear strength formula based on the modified strut-and-tie model(MSTM),which comes from the Kupfer-Gerstle failure criterion by taking the height of the compression zone of short beams as the height of the top nodes.The deduced formula has been validated using the experimental results of 16 strengthened short beams in the literature.It is found that the predictions by the proposed formula agree well with the experimental measurements,which proves the reliability of the proposed formula in predicting the shear strengths of simply-supported short beams strengthened by ferrocement with composite mortar.The formula can be used as reference for relevant engineering calculation.

关 键 词：复合砂浆钢筋网 钢筋混凝土短梁 抗剪加固 修正拉压杆模型(MSTM) 抗剪承载力公式 

分 类 号：TU375.1[建筑科学—结构工程]