全GFRP筋海水海砂自密实混凝土梁抗剪性能试验研究  

Experimental study on shear capacity of seawater sea-sand and self-compacting concrete beams with GFRP bars and stirrups

作　　者：吕家美 潘建荣[1] 邸博 郑愚[2] 朱文杰 李锦 张子健 周玲珠 Lü Jiamei;PAN Jianrong;DI Bo;ZHENG Yu;ZHU Wenjie;LI Jin;ZHANG Zijian;ZHOU Lingzhu(South China University of Technology,Guangzhou 510640,China;Dongguan University of Technology,Dongguan 523808,China)

机构地区：[1]华南理工大学,广东广州510640 [2]东莞理工学院,广东东莞523808

出　　处：《混凝土》2021年第11期53-57,共5页Concrete

基　　金：国家重点研发计划资助(2019YFC1511000);国家自然科学基金(51678149);广东省自然科学基金(2018A030313864);广东省基础与应用基础研究基金项目(2020A1515110573);东莞理工学院科研启动专项经费项目(GC300502-31)。

摘　　要：为探究全GFRP筋海水海砂自密实混凝土梁抗剪性能,现开展以剪跨比、混凝土基体类型为变量的试验研究。重点讨论剪跨比、混凝土基体类型对GFRP筋海水海砂自密实混凝土梁抗剪性能及承载力的影响规律。结果表明:随着剪跨比增大,弯曲开裂荷载无明显变化,混凝土梁跨中挠度增大,剪跨区产生斜裂缝所对应的荷载减小,混凝土梁极限承载力降低;对比淡水河砂FRP筋混凝土梁与海水海砂FRP筋混凝土梁,发现海水海砂代替淡水河砂对FRP筋混凝土梁的弯曲开裂荷载、跨中挠度、产生主斜裂缝所对应的荷载及极限承载力等方面均无明显差异;此外,当前各国规范计算式关于FRP筋混凝土梁抗剪承载力预测结果多数偏于保守。In order to explore the shear behavior of seawater sea-sand and self-compacting concrete beams with GFRP bars and stirrups,an experimental study is carried out with the shear span ratio and concrete matrix type as variables.It focuses on the influence of shear span ratio and concrete matrix type on the shear behavior and bearing capacity of seawater sea-sand and self-compacting concrete beams with GFRP bars and stirrups.The results show that with the increase of the shear span ratio,the flexural cracking load does not change significantly,the mid-span deflection of the concrete beam increases,the load corresponding to the diagonal cracks in the shear span area decreases,and the ultimate bearing capacity of the concrete beam decreases.Compared with freshwater river sand concrete beams with FRP reinforced and seawater sea sand concrete beams with FRP reinforced,it is found that there is no significant difference in seawater sea sand replaces freshwater river sand on the FRP reinforced concrete beams in terms of flexural cracking load,mid-span deflection,load corresponding to main diagonal cracks,and ultimate bearing capacity.In addition,the prediction results of shear capacity of FRP reinforced concrete beams with regard to the current national standard formulas are mostly conservative.

关 键 词：FRP筋 自密实混凝土 海水海砂 抗剪承载力 

分 类 号：TU528.01[建筑科学—建筑技术科学]