摘要
为指导桥梁墩柱加固设计,研究不同超高性能混凝土(UHPC)加固措施对钢筋混凝土(RC)墩柱轴压性能的影响,以加固方式(全高加固、非全高加固)、加固层材料(素UHPC、UHPC+钢筋网、UHPC+内FRP网格、UHPC+外FRP布)为参数,设计15根矩形RC墩柱试件(1个未加固试件、7个全高加固试件和7个非全高加固试件)进行轴压试验,分析其破坏模式和损伤机理,以及RC试件在轴压荷载作用下的极限承载力、刚度及延性等。结果表明:与未加固试件相比,全高加固试件、非全高加固试件的极限承载力提高率分别为142%~183%、28%~57%,但全高加固试件表现为脆性破坏,而非全高加固试件表现为延性破坏,宜根据工程实际需要采用合理的加固方式;采用不同加固层材料的加固效果为素UHPC、UHPC+内FRP网格、UHPC+外FRP布、UHPC+钢筋网依次递增,宜采用UHPC+钢筋网作为加固层材料。
The effect of different ultra-high performance concrete(UHPC)strengthening solutions on the axial compression performance of the reinforced concrete(RC)pier columns is studied in this work.Taking the strengthening measures(full-height and local strengthening) and strengthening materials(including the utilization of mere plain UHPC,UHPC plus mesh reinforcement,UHPC plus inner FRP textile grid,and UHPC plus outer FRP textile grid) as parameters,15 rectangular RC specimens(one ordinary specimen,7 specimens strengthened over height and 7 locally-strengthened specimens)were prepared for the axial compression tests,to analyze the failure modes and damage mechanism as well as the ultimate load bearing capacity,rigidity and ductility of the RC specimens under axial compressive loads.The results show that compared with the ordinary specimen,the load bearing capacities of the specimens strengthened over height increase about 142% to 183%,and those of the locally-strengthened specimens increase about 28% to 57%.The specimens strengthened over height exhibit brittle failure,while the locally-strengthened specimens experience ductile failure,indicating that the strengthening solutions should be selected depending on the actual engineering demands.The strengthening effect of the UHPC plus mesh reinforcement is the most notable,followed the UHPC plus outer FRP textile grid,UHPC plus inner FRP textile grid,and mere plain UHPC.Owing to this,it is better to choose UHPC plus mesh reinforcement as the strengthening material.
作者
林上顺
陶志蕾
夏樟华
林龙镁
赵锦冰
LIN Shang-shun;TAO Zhi-lei;XIA Zhang-hua;LIN Long-mei;ZHAO Jin-bing(Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering(Fujian)University of Technology,Fuzhou 350118,China;School of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Hao Yao Times(Fujian)Group Co.,Ltd.,Fuzhou 350108,China)
出处
《世界桥梁》
北大核心
2022年第6期102-108,共7页
World Bridges
基金
福建省自然科学基金项目(2019J01779)
厦门市建设局科技项目(XJK 2021-1-19)。
关键词
桥墩
UHPC
全高加固
非全高加固
加固层材料
承载力
刚度
延性
轴压试验
pier
UHPC
full-height strengthening
local strengthening
material for strengthening
load bearing capacity
rigidity
ductility
axial compression test
