纤维增强高强混凝土无腹筋梁受剪性能研究  

THE SHEAR PERFORMANCE OF HIGH-STRENGTH FIBER-REINFORCED CONCRETE BEAMS WITHOUT WEB REINFORCEMENT

作　　者：李妍[1,2] 林晓雅 LI Yan;LIN Xiaoya(College of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China;Jilin Engineering Research Center of Green Building Technology in Cold Land,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118 [2]吉林省寒地绿色建筑技术工程研究中心,长春130118

出　　处：《低温建筑技术》2025年第2期14-18,33,共6页Low Temperature Architecture Technology

摘　　要：为研究高强混凝土无腹筋梁受剪性能,文中采用ABAQUS有限元软件对6根高强混凝土无腹筋梁进行受剪模拟,对比分析剪跨比和废旧轮胎回收钢纤维掺量两个因素对结构载力的影响。结果表明随着剪跨比的增加混凝土梁的极限承载能力越来越小。根据废旧轮胎回收钢纤维体积率的增加其极限抗剪强度也随之增大,当废旧轮胎回收钢纤维掺量达到2%时效果最佳,试件梁极限承载能力提高了14.35%。并且废旧轮胎回收钢纤维的加入有效改善了高强混凝土梁韧性,限制斜截面裂缝的产生和发展,使试件破坏时保持其完整性。依据现有混凝土结构设计规范和纤维混凝土结构技术规程对高强混凝土无腹筋受剪承载力进行计算,其结果偏于安全。To investigate the shear performance of high-strength concrete beams without web reinforcement,the ABAQUS finite element software was used to simulate the shear behavior of six such beams.A comparative analysis was conducted to evaluate the effects of two factors-shear span-to-depth ratio and the content of recycled steel fibers from waste tires-on the structural load-carrying capacity.The results indicate that the ultimate load-bearing capacity of the concrete beams decreases as the shear span-to-depth ratio increases.Meanwhile,the ultimate shear strength increases with the volume fraction of recycled steel fibers.The optimal performance is achieved when the recycled steel fiber content reaches 2%,resulting in a 14.35% improvement in the ultimate load-bearing capacity of the test beams.Additionally,the inclusion of recycled steel fibers effectively enhances the toughness of high-strength concrete beams,restricting the initiation and propagation of diagonal cracks and maintaining the integrity of the specimens during failure.The shear capacity of high-strength concrete beams without web reinforcement,calculated based on existing concrete structural design codes and technical guidelines for fiber-reinforced concrete structures,is found to be conservatively safe.

关 键 词：高强混凝土 无腹筋梁 废旧轮胎回收钢纤维 受剪性能 

分 类 号：TU375[建筑科学—结构工程]