箍筋约束再生混凝土的抗压强度与破坏准则研究  

Study on compressive strength and failure criterion of recycled concrete confined by stirrup

作　　者：林海滨 彭有开[1] 李一鸣 吴超垚 吴徽[1] LIN Haibin;PENG Youkai;LI Yiming;WU Chaoyao;WU Hui(Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing Universily of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044

出　　处：《混凝土》2022年第7期39-43,共5页Concrete

基　　金：国家自然科学基金项目(51608027,51378044)。

摘　　要：为预测在箍筋侧向约束下再生混凝土的轴心抗压强度以及研究再生混凝土在复杂应力下的破坏准则,基于30个足尺再生混凝土圆形短柱和24个足尺再生混凝土方形短柱轴心受压试验数据,采用Willam-Warkne五参数破坏准则、赵国藩-宋玉普破坏准则、Ottosen破坏准则进行对比分析,并在Willam-Warkne五参数破坏准则的基础上拟合了适用于两种不同再生骨料取代率下再生混凝土的破坏准则。将Willam-Warkne五参数破坏准则、Ottosen破坏准则、赵国藩-宋玉普破坏准则、张家兴-何振军再生混凝土破坏准则、王玉梅-邓志恒再生混凝土破坏准则与拟合的再生混凝土破坏准则进行对比,结果表明,上述6种破坏准则预测值与试验值的平均比值分别为0.932 2、1.001、0.876 3、1.062 3、1.052 8、0.999 8,均方根误差分别为6.69、5.49、10.01、7.25、6.74、5.29,拟合的再生混凝土破坏准则理论计算值与试验值吻合良好,可以用于准确预测箍筋约束再生混凝土抗压强度。In order to predict the axial compressive strength of recycled concrete confined laterally by stirrup andto study the failure criterion of recycled concrete under complex stress,based on the axial compression test data of 30 full-scale recycled concrete short circular columns and 24 full-scale recycled concrete short square columns,the William-Warnke five-parameter failure criterion,Zhao Guofan-Song Yupu failure criterion and Ottosen failure criterion are compared and analyzed,and the failure criteria suitable for recycled concrete under two different recycled aggregate replacement rates are fitted on the basis of William-Warnke five-parameter failure criterion.Moreover,the William-Warnke five-parameter failure criterion,Ottosen failure criterion,Zhao Guofan-Song Yupu failure criterion,Zhang Jiaxing-He Zhenjun recycled concrete failure criterion,Wang Yumei-Deng Zhiheng recycled concrete failure criterion and the fitted recycled concrete failure criterion are compared.The results show that the average ratios of the predicted values to the test values of the above six failure criteria are 0.9322,1.001,0.8763,1.0623,1.0528 and 0.9998,respectively.The root mean square errors are 6.69,5.49,10.01,7.25,6.74 and 5.29,respectively.The calculated values of the failure criterion of recycled concrete are in good agreement with the experimental values,which can be used to accurately predict the compressive strength of recycled concrete confined by stirrup.

关 键 词：再生混凝土 箍筋约束 轴心抗压强度 破坏准则 

分 类 号：TU528.01[建筑科学—建筑技术科学]