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Experiment on Durability of Concrete Beams Reinforced by CFRP Grid Stirrup Under Coupling Action of Sustained Load and Marine Environment(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年04期
Page:
65-72
Research Field:
Publishing date:

Info

Title:
Experiment on Durability of Concrete Beams Reinforced by CFRP Grid Stirrup Under Coupling Action of Sustained Load and Marine Environment
Author(s):
HE Jun;  LIU Ze-pu;  WU Tao
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
CFRP grid stirrup;  sustained load;  seawater immersion;  creep;  ultimate bearing capacity
PACS:
TU973.2
DOI:
10.19815/j.jace.2021.03021
Abstract:
In order to study the problems of the decrease of service life of marine structures caused by crack and corrode of marine reinforced concrete structures under the coupling action of sustained load and marine environment, the short-term durability of four concrete beams with carbon fiber reinforced composite(CFRP)grid stirrups was studied by taking the seawater immersion time(0, 90 d)and sustained load level(0, 24%Pu, 48%Pu, Pu was ultimate bearing capacity)as variables. After 90 d of seawater immersion and sustained load, the shear behavior of concrete beams was tested. The results show that in the sustained load and seawater immersion coupling process, the deflection of concrete beams with CFRP grid stirrups continues to increase with time, and the initial deflection increases rapidly, then slows down, and finally tends to be stable. The creep of 24%Pu concrete beam with sustained load tends to be stable at 21 d, while the creep of 48%Pu concrete beam with sustained load tends to be stable at 45 d. The ultimate bearing capacity of the concrete beam with CFRP grid stirrups after the coupling action of sustained load and seawater immersion is about 24% higher than that of the concrete beam with CFRP grid stirrups without sustained load and immersion, and the initial stiffness of the beam increases with the increase of load holding grade. Concrete beams with CFRP grid stirrups have good short-term durability in marine environment and can be used in offshore engineering.

References:

[1] YIN S P,NA M W,YU Y L,et al.Research on the Flexural Performance of RC Beams Strengthened with TRC Under the Coupling Action of Load and Marine Environment[J].Construction and Building Materials,2017,132:251-261.
[2]李 彪,李家兴,贾 彬,等.海水浸泡与应力耦合作用下碳纤维复材网格单肢拉伸力学性能试验研究[J].工业建筑,2020,50(11):178-183.
LI Biao,LI Jia-xing,JIA Bin,et al.Experimental Study on the Tensile Properties of CFRP Grids Under the Coupling of Seawater Immersion and Stress[J].Industrial Construction,2020,50(11):178-183.
[3]WANG B,UJI K,WU T,et al.Experimental Investigation of Stress Transfer and Failure Mechanism Between Existing Concrete and CFRP Grid-sprayed PCM[J].Construction and Building Materials,2019,215:43-58.
[4]MEISAMI M H,MOSTOFINEJAD D,NAKAMURA H.Punching Shear Strengthening of Two-way Flat Slabs with CFRP Grids[J].Journal of Composites for Construction,2014,18(2):04013047.
[5]GUO R,PAN Y,CAI L,et al.Study on Design Formula of Shear Capacity of RC Beams Reinforced by CFRP Grid with PCM Shotcrete Method[J].Engineering Structures,2018,166:427-440.
[6]刘宗全,岳清瑞,李 荣,等.FRP网格材在土木工程中的应用[C]//岳清瑞.第九届全国建设工程FRP应用学术交流会论文集.北京:《工业建筑》杂志社,2015:102-106.
LIU Zong-quan,YUE Qing-rui,LI Rong,et al.FRP Grid in Civil Engineering Applications[C]//YUE Qing-rui.Proceeding of the 9th National Construction Engineering Application of FRP Academic Exchange.Beijing:Industrial Construction Press,2015:102-106.
[7]ALSAAD A,HASSAN G.Utilization of CFRP for Strengthening RC Columns in Marine Environment[J].Case Studies in Construction Materials,2017,7:30-35.
[8]黄泽奇.剪跨比和配箍率对FRP网格箍混凝土梁的抗剪性能影响的研究[D].深圳:深圳大学,2019.
HUANG Ze-qi.Study on Shear Performance of FRP Textile Stirrup Concrete Beams with Shear Span Ratio and Stirrup Ratio[D].Shenzhen:Shenzhen University,2019.
[9]张儒成,李 荣.碳纤维复材网格黏结性能试验研究[J].工业建筑,2019,49(11):98-102.
ZHANG Ru-cheng,LI Rong.Experimental Research on the Bonding Properties of CFRP Grids[J].Industrial Construction,2019,49(11):98-102.
[10]李 贺.CFRP网格筋混凝土受弯构件抗剪性能的研究[D].南京:东南大学,2018.
LI He.Experimental Study on Shear Behavior of CFRP Grid Reinforced Concrete Flexural Members[D].Nanjing:Southeast University,2018.
[11]邱红利,李 荣.复材网格箍筋混凝土梁受剪性能试验研究[J].工业建筑,2019,49(3):42-45,62.
QIU Hong-li,LI Rong.Experimental Research on the Shear Behavior of Concrete Beams with FRP Grid Stirrups[J].Industrial Construction,2019,49(3):42-45,62.
[12]GB/T 50152—2012,混凝土结构试验方法标准[S].
GB/T 50152—2012,Standard for Test Method of Concrete Structures[S].
[13]何世钦,曹泽阳,刘伟杰,等.长期荷载和氯盐环境耦合作用对钢筋混凝土梁挠度的影响[J].清华大学学报:自然科学版,2019,59(11):902-909.
HE Shi-qin,CAO Ze-yang,LIU Wei-jie,et al.Influence of Long-term Load and Chlorine Corrosion on Reinforced Concrete Beam Deflection[J].Journal of Tsinghua University:Science and Technology,2019,59(11):902-909.
[14]卓 旬,梅明荣.混凝土徐变计算理论和方法综述[J].水利与建筑工程学报,2012,10(2):14-19,40.
ZHUO Xun,MEI Ming-rong.Summarized Account for Calculation Theory and Methods of Concrete Creep[J].Journal of Water Resources and Architectural Engineering,2012,10(2):14-19,40.
[15]夏 晋,吴仁杰,金伟良,等.机制砂钢筋混凝土梁的徐变特性[J].建筑结构学报,2020,41(增2):227-234.
XIA Jin,WU Ren-jie,JIN Wei-liang,et al.Creep Characteristics of Reinforced Concrete Beams Made with Manufactured Sands[J].Journal of Building Structures,2020,41(S2):227-234.
[16]颜东煌,田仲初,李学文,等.混凝土桥梁收缩徐变计算的有限元方法与应用[J].中国公路学报,2004,17(2):55-58.
YAN Dong-huang,TIAN Zhong-chu,LI Xue-wen,et al.Finite Element Method and Application for the Shrinkage and Creep of Concrete Bridges[J].China Journal of Highway and Transport,2004,17(2):55-58.
[17]AL-SALLOUM Y A,ALMUSALLAM T H. Creep Effect on the Behavior of Concrete Beams Reinforced with GFRP Bars Subjected to Different Environments[J].Construction and Building Materials,2007,21(7):1510-1519.
[18]石煜威.海洋环境BFRP-钢筋混合配筋混凝土梁耐久性能研究[D].南京:东南大学,2019.
SHI Yu-wei.Durability Study and Theoretical Analysis on Concrete Beams Reinforced with BFRP with Steel Bars Exposed to Marine Environments[D].Nanjing:Southeast University,2019.
[19]PARK Y H,KIM Y,LEE S H.Long-term Flexural Behaviors of GFRP Reinforced Concrete Beams Exposed to Accelerated Aging Exposure Conditions[J].Polymers,2014,6(6):1773-1793.
[20]YAN F,LIN Z.Bond Durability Assessment and Long-term Degradation Prediction for GFRP Bars to Fiber-reinforced Concrete Under Saline Solutions[J].Composite Structures,2017,161:393-406.

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Last Update: 2021-07-10