GFRP筋玄武岩纤维混凝土深梁抗剪性能  

Shear performance of GFRP bars reinforced basalt fiber concrete deep beams

作　　者：李趁趁[1] 魏非凡 邢枭男 朱海堂 LI Chenchen;WEI Feifan;XING Xiaonan;ZHU Haitang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;College of Civil Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南工程学院土木工程学院,河南郑州451191

出　　处：《华中科技大学学报(自然科学版)》2025年第2期104-110,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：河南省自然科学基金资助项目(232300420102)。

摘　　要：为避免钢筋锈蚀,促进纤维增强聚合物筋(FRP筋)在各类结构构件中的应用,研究了玻璃纤维增强聚合物筋(GFRP筋)玄武岩纤维混凝土有腹筋深梁的抗剪性能,考虑剪跨比(a/d)、水平分布筋配筋率(ρ_(h))、竖向分布筋配筋率(ρ_(v))的影响,设计7根试验梁进行抗剪性能试验,分析其破坏形态、跨中挠度、开裂荷载及极限荷载.结果表明,7根深梁破坏形态均为斜压破坏,FRP筋纤维混凝土深梁与钢筋混凝土深梁抗剪机制类似.剪跨比的减小可以有效提高深梁的受剪承载力,从1.1减少至0.5,承载力提高了47.1%;ρ_(h)提高可以延缓裂缝的发展从而提高开裂荷载,ρ_(h)对受剪承载力的提升最大可达31.4%,ρ_(v)对受剪承载力的提升最大可达16.9%.最后,建立了FRP筋纤维混凝土深梁受剪承载力计算公式,计算值与试验值符合良好.In order to avoid the corrosion of steel bars and promote the application of FRP bars in various structural components,the shear performance of glass fiber reinforced polymer bars(GFRP bars)reinforced basalt fiber concrete deep beams with web reinforcement was studied.Considering the influence of shear span ratio(ald),horizontal distribution reinforcement ratio(p_(h))and vertical distribution reinforcement ratio(p_(v)),seven test beams were designed for shear performance test,and their failure modes,midspan deflection,cracking load and ultimate load were analyzed.The results show that the failure modes of the seven deep beams are all diagonal compression failure,and the shear mechanism of FRP bars reinforced fiber concrete deep beams is similar to that of steel bars reinforced concrete deep beams.The decrease of shear span ratio can effectively improve the shear capacity of deep beams,from 1.1 to 0.5,and the bearing capacity is increased by 47.1%.The increase of p_(h) can delay the development of cracks and increase the cracking load.The maximum increase of shear bearing capacity from p_(h) can reach 31.4%,and the maximum increase of shear bearing capacity from p_(v) can reach 16.9%.Finally,the formula for calculating the shear capacity of FRP bars reinforced fiber concrete deep beams is established,and the calculated values are in good agreement with the experimental values.

关 键 词：GFRP筋 纤维混凝土 深梁 腹筋 受剪承载力 

分 类 号：TU377.9[建筑科学—结构工程]