|Table of Contents|

Experimental study on flexural performance of corroded reinforced concrete beams after fire exposure(PDF)

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

Issue:
2024年01期
Page:
138-145
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on flexural performance of corroded reinforced concrete beams after fire exposure
Author(s):
BA Guangzhong1;  ZHENG Xinxin1;  LIU Caiwei2;  LIU Hao2
(1.College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China; 2.College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China)
Keywords:
corroded reinforcement;  fire;  temperature field;  failure mode;  residual bending bearing capacity
PACS:
TU312
DOI:
10.19815/j.jace.2022.04005
Abstract:
In order to study the residual mechanical properties of existing concrete structures after fire, 9 reinforced concrete beams were designed and fabricated. The corroded concrete beams with different corrosion degrees(target corrosion degree was 5% and 15%)were obtained by electrochemical accelerated corrosion tests. The fire tests were conducted for different fire durations(1 h and 2 h)according to the ISO834 standard heating curve. Finally, the static loading tests were conducted on all concrete beams. The results show that the failure process and mode of the corroded reinforced concrete beams are similar to those of the ordinary concrete beams, which shows bending failure mode. Compared to ordinary beams, their load-deflection curve will shift downwards and exhibit characteristics of working with cracks and failure stages, and the deflection deformation is also greater. For concrete beams that have undergone different fire exposure time, steel corrosion significantly reduces their yield load, but the effect of steel corrosion on the ultimate load of concrete beams at room temperature is relatively small. The effect of fire significantly reduces the ultimate bearing capacity of concrete beams. The variation pattern of residual bearing capacity of slightly corroded beams after fire is similar to that of non corroded beams, and the corrosion of steel bars hardly weakens the bending bearing capacity of the components. For severely corroded beams, due to the weakening of the cross-section caused by corrosion and the influence of rust expansion cracks, the highest temperature experienced by corroded concrete beams under fire is higher, and their residual ultimate bearing capacity accelerates to decrease after the fire. The residual ultimate bearing capacity of concrete beam with corrosion rate of 13.5% for the same fire exposure time is 15.9% lower than that of concrete beam with corrosion rate of 6.2%.

References:

[1] 张玉涛,马 婷,林 姣,等.2007—2016年全国重特大火灾事故分析及时空分布规律[J].西安科技大学学报,2017,37(6):829-836.
ZHANG Yutao,MA Ting,LIN Jiao,et al.Analysis of fire incidents and characteristics of spatio-temporal distributions for serious fires from 2007 to 2016 in China[J].Journal of Xi'an University of Science and Technology,2017,37(6):829-836.
[2]MEHTA P K,BURROWS R W.Building durable structures in the 21st century[J].Indian Concrete Journal,2001,75(7):437-443.
[3]孙晓燕,王海龙,于凤荣.锈损不锈钢钢筋混凝土梁受弯性能退化试验研究[J].建筑结构学报,2021,42(6):160-168.
SUN Xiaoyan,WANG Hailong,YU Fengrong.Experimental study on degradation of flexural performance of corroded stainless steel bars reinforced concrete beam[J].Journal of Building Structures,2021,42(6):160-168.
[4]MAADDAWY T E,SOUDKI K,TOPPER T.Long-term performance of corrosion-damaged reinforced concrete beams[J].ACI Structural Journal,2005,102(5):649-656.
[5]DU Y,CLARK L A,CHAN A.Impact of reinforcement corrosion on ductile behavior of reinforced concrete beams[J].ACI Structural Journal,2007,104(3):285-293.
[6]JNAID F,ABOUTAHA R S.Residual flexural strength of corroded reinforced concrete beams[J].Engineering Structures,2016,119:198-216.
[7]SOBHAN K,REDDY D V,MARTINEZ F.Fire resistance of corroded high-strength structural concrete[J].Journal of Structural Fire Engineering,2020,12(1):17-34.
[8]刘 文.锈蚀钢筋混凝土梁高温性能与残余承载力试验研究[D].青岛:青岛理工大学,2018.
LIU Wen.Experimental research on high temperature performance and residual bearing capacity of RC beams with corrosion damage[D].Qingdao:Qingdao University of Tehcnology,2018.
[9]BA G Z,MIAO J J,ZHANG W P,et al.Influence of reinforcement corrosion on fire performance of reinforced concrete beams[J].Construction and Building Materials,2019,213:738-747.
[10]PORCARI G L,ZALOK E,ISGOR O.Fire performance of corrosion-damaged reinforced concrete beams[J].Journal of Structural Fire Engineering,2012,3(4):311-326.
[11]王吉祥,刘 文.钢筋混凝土梁受损工况下高温试验研究[J].工程建设,2019,51(7):13-18.
WANG Jixiang,LIU Wen.Experimental study on high temperature performance of corroded reinforced concrete beams[J].Engineering Construction,2019,51(7):13-18.
[12]苗吉军,刘 芳,刘延春,等.考虑海洋环境损伤的钢筋混凝土梁抗火性能试验研究[J].建筑结构学报,2014,35(9):64-71.
MIAO Jijun,LIU Fang,LIU Yanchun,et al.Experimental research on fire resistance performance for RC beams with damages caused by marine environment[J].Journal of Building Structures,2014,35(9):64-71.
[13]TARIQ F,GAIKWAD M,BHARGAVA P.Analysis of behaviour of corroded RC beams exposed to elevated temperatures[J].Journal of Building Engineering,2021,42:102508.
[14]刘 芳.海洋环境损伤后的混凝土梁抗火性能试验研究与数值分析[D].青岛:青岛理工大学,2014.
LIU Fang.Experimental research and numerical simulation on fire resistence performance for R.C.beams with damages caused by marine environment[D].Qingdao:Qingdao University of Technology,2014.
[15]EL MAADDAWY T A,SOUDKI K A.Effectiveness of impressed current technique to simulate corrosion of steel reinforcement in concrete[J].Journal of Materials in Civil Engineering,2003,15(1):41-47.
[16]ZHANG W P,SONG X B,GU X L,et al.Tensile and fatigue behavior of corroded rebars[J].Construction and Building Materials,2012,34:409-417.
[17]混凝土结构试验方法标准:GB 50152—1992[S].北京:中国建筑工业出版社,1992.
Testing methods of concrete structure:GB 50152—1992[S].Beijing:China Architecture & Building Press,1992.
[18]惠云玲,李 荣,林志伸,等.混凝土基本构件钢筋锈蚀前后性能试验研究[J].工业建筑,1997,27(6):15-19,58.
HUI Yunling,LI Rong,LIN Zhishen,et al.Experimental studies on the property before and after corrosion of rebars in basic concrete members[J].Industrial Construction,1997,27(6):15-19,58.
[19]KEARSLEY E P,JOYCE A.Effect of corrosion products on bond strength and flexural behaviour of reinforced concrete slabs[J].Journal of the South African Institution of Civil Engineering,2014,56(2):21-29.
[20]BA G Z,ZHANG W P,MIAO J J.Tensile behavior of corroded steel bars at elevated temperatures[J].Journal of Materials in Civil Engineering,2021,33(4):040210128.
[21]TOPCU I B,BOGA A R,DEMIR A.The effect of elevated temperatures on corroded and uncorroded reinforcement embedded in mortar[J].Construction and Building Materials,2010,24(11):2101-2107.

Memo

Memo:
-
Last Update: 2024-01-25