钢筋-GFRP混合配筋增强RPC梁的受弯性能  

Flexural performance of hybrid steel-GFRP reinforced RPC beams

作　　者：陈秉祥 朱燕竹 王琨[1,2] 蔡文侠 魏亮 杨洋 曹大富[1] 杨冬冬 CHEN Bingxiang;ZHU Yanzhu;WANG Kun;CAI Wenxia;WEI Liang;YANG Yang;CAO Dafu;YANG Dongdong(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Key Laboratory of Structural Engineering Disaster and Control(Ministry of Education),Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,哈尔滨150090

出　　处：《扬州大学学报(自然科学版)》2025年第1期57-63,72,共8页Journal of Yangzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51878589);哈尔滨工业大学结构工程灾变与控制教育部重点实验室开放基金课题(HITCE202105);扬州市科技计划项目(YZ2024223);扬州大学研究生科研与实践创新计划资助项目(KYCX23-3541)。

摘　　要：为研究钢筋与玻璃纤维增强复合材料(glass fiber reinforced polymer,GFRP)混合配筋的活性粉末混凝土(reactive powder concrete,RPC)梁的受弯性能,对6根钢筋-GFRP混合配筋RPC梁进行竖向静力加载试验,分析其裂缝分布,开裂、屈服和极限荷载,钢筋、GFRP筋应变以及跨中应变分布等,并推导出混合配筋梁的开裂弯矩和正截面受弯承载力计算公式。研究结果表明:保持其他条件不变,当GFRP筋面积从307.9 mm2增大至508.9 mm2时,极限荷载由265.0 kN增至306.2 kN,屈服荷载由199.8 kN增至238.8 kN;当钢筋面积从628.3 mm2增大至981.8 mm2时,极限荷载由267.8 kN增至306.2 kN,屈服荷载由183.5 kN增至238.8 kN;在钢筋与GFRP筋承担合力相同的情况下,随着钢筋配筋面积的增加,混合配筋试验梁的屈服荷载呈显著上升趋势,而开裂荷载则基本不变;采用推导公式计算的正截面受弯承载力和开裂弯矩与试验结果基本一致。To study the flexural performance of reactive powder concrete(RPC)beams reinforced with hybrid steel and glass fiber reinforced polymer(GFRP)bars,vertical static loading tests are conducted on six hybrid reinforced RPC beams.The crack distribution,cracking load,yield load,ultimate load,strains in steel and GFRP bars,and mid-span strain distribution are analyzed.Formulas for calculating the cracking moment and flexural capacity of the normal section of hybrid-reinforced beams are derived.The research results show that,with other conditions unchanged,when the GFRP reinforcement area increases from 307.9 mm2 to 508.9 mm²,the ultimate load increases from 265.0 kN to 306.2 kN,and the yield load increases from 199.8 kN to 238.8 kN.When the steel reinforcement area increases from 628.3 mm²to 981.8 mm²,the ultimate load increases from 267.8 kN to 306.2 kN,and the yield load increases from 183.5 kN to 238.8 kN.Under the condition of equal total reinforcement area,with the increase of the steel reinforcement area,the yield load of hybrid reinforced beams shows a significant upward trend,while the cracking load remains basically unchanged.The flexural capacity of normal section and the cracking moment calculated by the derived formula are basically consistent with the test results.

关 键 词：混合配筋 纤维增强复合材料 活性粉末混泥土 正截面受弯承载力 

分 类 号：TU377.9[建筑科学—结构工程]