GFRP筋再生混凝土梁受弯承载力研究  

Study on flexural capacity of recycled concrete beams with GFRP bars

作　　者：孔祥清[1] 韩硕[1] 刚建明 陈信展 王学志[1] 章文姣[1] KONG Xiangqing;HAN Shuo;GANG Jianming;CHEN Xinzhan;WANG Xuezhi;ZHANG Wenjiao(Department of Civil and Architecture Engineering,Liaoning University of Technology,Jinzhou 121001,China;Jinzhou Petrochemical Engineering Construction Supervision Co.,Ltd.,Jinzhou 121001,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,锦州121001 [2]锦州石化工程建设监理有限公司,锦州121001

出　　处：《建筑结构》2024年第8期50-56,共7页Building Structure

基　　金：国家自然科学基金项目(51479168);辽宁省“兴辽英才计划”项目(XLYC1807052、XLYC1807044)。

摘　　要：为研究GFRP筋再生混凝土梁(GFRP-RAC)的受弯承载力,完成了5根配GFRP筋、1根配BFRP筋和1根配钢筋的再生混凝土梁抗弯试验,分析了不同再生骨料取代率、纵筋类型以及纵筋配筋率等因素对各试验梁开裂荷载和极限承载力的影响。结果表明:再生骨料取代率对开裂荷载的影响较大,而纵筋类型及纵筋配筋率对其影响不明显;当再生骨料取代率由0增加至50%和100%时,试验梁开裂荷载分别减小了7.9%和17.3%;极限承载力受再生骨料取代率影响较小而受纵筋配筋率影响较大,当GFRP-RAC梁纵筋配筋率由0.38%提高至0.6%和1.17%时,极限荷载分别提升了17.9%和52.5%。另外,结合国内外规范对GFRP-RAC梁的受弯承载力进行对比分析,并基于试验数据和相关试验结果的回归分析,得到开裂荷载修正系数αcr,开裂荷载修正后的计算值与试验值吻合较好。In order to study the flexural capacity of recycled concrete beams with GFRP(Glass Fiber Reinforced Polymer)bars(GFRP-RAC),the flexural tests of five recycled concrete beams with GFRP bars,one recycled concrete beams with BFRP bars and one recycled concrete beams with steel bars were carried out,and the effects of different recycled aggregate replacement rate,longitudinal reinforcement type and longitudinal reinforcement ratio on the cracking load and ultimate bearing capacity of each test beam were analyzed.The results show that the recycled aggregate replacement rate has a great influence on the cracking load,while the longitudinal reinforcement type and longitudinal reinforcement ratio have no obvious influence on the cracking load.When the recycled aggregate replacement rate increases from 0 to 50%and 100%,the cracking load of the test beam decreases by 7.9%and 17.3%,respectively.The ultimate bearing capacity is less affected by the recycled aggregate replacement rate than by longitudinal reinforcement ratio.When the longitudinal reinforcement ratio of GFRP-RAC beam increases from 0.38%to 0.6%and 1.17%,the ultimate bearing capacity increases by 17.9%and 52.5%,respectively.In addition,the flexural capacity of GFRP-RAC beams ware compared and analyzed according to the domestic and foreign codes,and the cracking load correction factorαcr was obtained by regression analysis based on the test data and related test results.The calculated values corrected for cracking loads are in good agreement with test values.

关 键 词：GFRP筋 再生混凝土 受弯承载力 再生骨料取代率 纵筋配筋率 

分 类 号：TU377.91[建筑科学—结构工程]