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

卷:

40卷

期数:

2023年05期

页码:

52-59

栏目:

建筑结构

出版日期:

2023-09-15

文章信息/Info

Title:

Degradation analysis of flexural performance of marine concrete beams under combined action of chloride and repeated load

文章编号:

1673-2049(2023)05-0052-08

作者:

陆春华¹,宋泽鹏¹,李锺奥¹,张菊连²

(1. 江苏大学 土木工程与力学学院,江苏 镇江 212013; 2. 上海宏信建筑科技有限公司,上海 201800)

Author(s):

LU Chunhua¹, SONG Zepeng¹, LI Zhongao¹, ZHANG Julian²

(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Shanghai Horizon Construction Technology Co. Ltd., Shanghai 201800, China)

关键词:

海工混凝土梁;  氯盐环境;  重复荷载;  受弯性能

Keywords:

marine concrete beam;  chloride environment;  repeated load;  flexural performance

分类号:

TU375.1

DOI:

10.19815/j.jace.2021.12111

文献标志码:

A

摘要:

为研究氯盐与重复荷载共同作用下海工混凝土梁受弯性能的退化规律,选用硅灰、粉煤灰、纳米二氧化硅制备了3组共10根海工混凝土梁。通过两两自锚和在梁受拉侧设置吸水海绵的方式,实现了对试验梁施加重复荷载的同时进行氯盐干湿循环作用,经30次循环后对试验梁的受弯性能进行了评价。结合试验结果,提出了重复荷载作用下海工混凝土梁受弯承载力退化系数,并给出了海工混凝土梁受弯承载力退化计算公式。结果表明:对于仅进行氯盐干湿循环的梁,其荷载-挠度曲线发展与对比梁类似,且极限弯矩略有提高; 对于氯盐和重复荷载共同作用下的梁,随着重复荷载水平的增大,梁的受弯裂缝开展及破坏形态未发生明显的变化,但其极限弯矩却出现了明显退化,同时梁的变形能力及其延性性能均呈现大幅下降; 相同条件下,复掺粉煤灰和硅灰的海工混凝土梁受弯性能更优,且在氯盐与重复荷载共同作用下的受弯性能退化程度较低; 通过试验实测结果与公式预测结果对比分析,验证了受弯承载力退化公式的合理性和有效性。

Abstract:

To investigate the degradation law of flexural performance of marine concrete beams under the combined action of chloride and repeated load, silica fume, fly ash and nano-silica were selected to prepare 3 groups of 10 marine concrete beams. By means of self-anchoring in pairs and setting water absorbent sponge at the tension zone of test beams, the repeated loads were applied to the test beams together with the dry-wet cycles of chloride solution. The flexural performance of the test beam was evaluated after 30 cycles. Combined with the test results, the influence coefficient α(λ) of repeated load level λ on the degradation of flexural capacity of marine concrete beams was proposed, and the calculation formula of the degradation of flexural capacity of marine concrete beams was given. The results show that the load-deflection curve of the beam only subjected to chloride dry-wet cycle is similar to that of the contrast beam, and the ultimate bending moment is slightly increased. For the beam under the combined action of chloride and repeated load, with the increase of repeated load level, the development of flexural crack and the failure mode does not change significantly, but the ultimate bending moment shows obvious degradation, and the deformation capacity and ductility of the test beam decrease significantly. Under the same condition, the flexural performance of marine concrete beams mixed with fly ash and silica fume is better, and the degradation degree of flexural performance under the combined action of chloride and repeated load is lower. The rationality and validity of the bending capacity degradation formula are verified by comparing the experimental results with the formula prediction results.

参考文献/References:

[1] 金伟良,赵羽习.混凝土结构耐久性[M].2版.北京:科学出版社,2014.
JIN Weiliang,ZHAO Yuxi.Durability of concrete structures[M].2nd ed.Beijing:Science Press,2014.
[2]FARAHANI A,TAGHADDOS H,SHEKARCHI M.Prediction of long-term chloride diffusion in silica fume concrete in a marine environment[J].Cement and Concrete Composites,2015,59:10-17.
[3]张敏杰,蒋亚清,赵 越.海工高性能混凝土配制及耐久性研究[J].混凝土与水泥制品,2017(6):1-5.
ZHANG Minjie,JIANG Yaqing,ZHAO Yue.Research on preparation and durability of marine engineering high-performance concrete[J].China Concrete and Cement Products,2017(6):1-5.
[4]NEZERKA V,BILY P,HRBEK V,et al.Impact of silica fume,fly ash,and metakaolin on the thickness and strength of the ITZ in concrete[J].Cement and Concrete Composites,2019,103:252-262.
[5]王冬松.杭州湾跨海大桥高性能海工混凝土配合比设计[J].公路,2009,54(7):299-303.
WANG Dongsong.Mix proportion design of high performance marine concrete for Hangzhou Bay bridge[J].Highway,2009,54(7):299-303.
[6]李 超,王胜年,范志宏,等.港珠澳大桥长寿命海工高性能混凝土配制[J].水运工程,2015(3):85-92.
LI Chao,WANG Shengnian,FAN Zhihong,et al.Preparation of long-service-life marine high-performance concrete for Hong Kong-Zhuhai-Macao bridge[J].Port & Waterway Engineering,2015(3):85-92.
[7]PALA M,OZBAY E,OZTAS A,et al.Appraisal of long-term effects of fly ash and silica fume on compressive strength of concrete by neural networks[J].Construction and Building Materials,2007,21(2):384-394.
[8]朱亚鹏,余 亮,吕 健,等.粉煤灰与矿渣对混凝土物理力学性能及耐久性能的影响[J].武汉大学学报(工学版),2018,51(增1):130-134.
ZHU Yapeng,YU Liang,LV Jian,et al.Effect of fly ash and slag on physico-mechanical property and durability behavior of concrete[J].Engineering Journal of Wuhan University,2018,51(S1):130-134.
[9]彭 刚,胡晓鹏,牛荻涛,等.施工期混凝土重复荷载作用下的受压应力-应变关系[J].建筑材料学报,2020,23(6):1479-1487.
PENG Gang,HU Xiaopeng,NIU Ditao,et al.Compressive stress-strain relationship of concrete during construction under repeated loading[J].Journal of Building Materials,2020,23(6):1479-1487.
[10]钟 铭.钢筋混凝土梁桥疲劳性能评估[M].北京:中国建筑工业出版社,2019.
ZHONG Ming.Fatigue performance evaluation of reinforced concrete girder bridges[M].Beijing:China Architecture & Building Press,2019.
[11]苏林王.荷载与海洋环境耦合作用下海工混凝土结构耐久性研究[D].广州:华南理工大学,2016.
SU Linwang.Study on durability of marine concrete structure under coupling effect of load and marine environment[D].Guangzhou:South China University of Technology,2016.
[12]刘 扬,江 楠,邓 扬.持续荷载与氯离子共同作用下RC梁抗弯试验研究[J].公路交通科技,2014,31(10):65-70.
LIU Yang,JIANG Nan,DENG Yang.Experimental study on flexure behavior of RC beams under combined action of sustained loading and chloride ions[J].Journal of Highway and Transportation Research and Development,2014,31(10):65-70.
[13]金伟良,王 毅.持续荷载与氯盐作用下钢筋混凝土梁力学性能试验[J].浙江大学学报(工学版),2014,48(2):221-227.
JIN Weiliang,WANG Yi.Experimental study on mechanics behaviors of reinforced concrete beams under simultaneous chloride attacks and sustained load[J].Journal of Zhejiang University(Engineering Science),2014,48(2):221-227.
[14]崔钊玮,刘荣桂,陆春华,等.干湿循环与受弯裂缝共同作用下海工砼梁内氯离子侵蚀及耐久性寿命预测[J].硅酸盐通报,2020,39(2):344-351.
CUI Zhaowei,LIU Ronggui,LU Chunhua,et al.Chloride ion erosion and durability life prediction of marine concrete beams under combined action of dry-wet cycle and flexural cracks[J].Bulletin of the Chinese Ceramic Society,2020,39(2):344-351.
[15]CHEN F,GAO J M,QI B,et al.Degradation progress of concrete subject to combined sulfate-chloride attack under drying-wetting cycles and flexural loading[J].Construction and Building Materials,2017,151:164-171.
[16]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.
[17]混凝土结构试验方法标准:GB/T 50152—2012[S].北京:中国建筑工业出版社,2012.
Standard for test method of concrete structures:GB/T 50152—2012[S].Beijing:China Architecture & Building Press,2012.
[18]苗生龙,李庆涛,赵园园,等.高温后纳米SiO₂混凝土力学性能试验研究[J].应用基础与工程科学学报,2021,29(4):999-1006.
MIAO Shenglong,LI Qingtao,ZHAO Yuanyuan,et al.Experimental study on mechanical properties of nano-SiO₂ concrete after high temperature[J].Journal of Basic Science and Engineering,2021,29(4):999-1006.
[19]混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.
Code for design of concrete structures:GB 50010—2010[S].Beijing:China Architecture & Building Press,2011.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-12-05
基金项目:国家自然科学基金项目(51878319)
作者简介:陆春华(1979-),男,工学博士,教授,博士生导师,E-mail:lch79@ujs.edu.cn。

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更新日期/Last Update: 2023-09-01