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The experiment of ultimate capacity for the reinforced concrete beam strengthened with CFRP

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The experiment of ultimate capacity for the reinforced concr...

Performance of Epoxy-Repaired Corroded reinforced concrete beams

The 2011 International Conference on Key Engineering Materials and Computer Science(KEMCS 2011)

作者： Jian He Tong Wang Huan Wang College of Aerospace and Civil Engineering Harbin Engineering University

As to reinforced concrete structure, the method to deal with the shortage of bearing capacity is one of the puzzles of structure engineering, so its reinforcement technology is a research hotspotAt present, although there are many reinforcing methods of existing structures, FRP is the more widely used in engineering because of its efficiency, low cost, and beautyThe paper takes the strengthened reinforced concrete structure beam with FRP for example, bearing capacity of normal section, the shear bearing capacity and cohesiveness is tested, and bearing performance for strengthening the strengthened reinforced concrete beam with FRP is analyzed.

关键词： CFRP reinforced concrete beam Ultimate capacity Mechanical property experiment

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Transactions of Nanjing University of Aeronautics and Astronautics 2015年第5期32卷 579-584页

作者：李洪明吴瑾王喆尚保康 College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

Reinforcement corrosion has a serious impact on the durability and safety of reinforced concrete *** reinforced concrete(RC)beam specimens are *** beam specimens are subjected to accelerated corrosion with the constant current,beam specimens are repaired with epoxy mortar and the flexural test of beams is *** the behaviors of repaired corroded reinforced concrete beams are *** experimental results show that cracking and ultimate loads of corroded RC beams are enhanced after being *** the strain distributions measured across sections of beam specimens still obey the assumption of plane *** being repaired,the number of cracks decreases and the crack spacing increases.

关键词： corrosion reinforced concrete beam epoxy mortar flexural behavior repair

维普期刊数据库

Detecting Damage in reinforced concrete beams Using Vibrational Characteristics

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Open Journal of Civil Engineering 2022年第4期12卷 559-571页

作者： Ho Thu Hien Nguyen Danh Thang Nguyen Ngoc Dang Vietnam National University Ho Chi Minh City Ben Tre Province Vietnam Faculty of Civil Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh Vietnam

This paper evaluates two methods of diagnosing damage, Natural frequency and Stiffness-Frequency change-Based damage detection method in reinforced concrete beams under load using vibration characteristics such as natural frequency and mode shape. The research uses finite element method with crack damage instead of deleting or reducing the bearing capacity of the element like in previous studies. First, a theory of the damage diagnosis method based on the change of natural frequency and mode shape is presented. Next, the simulation results of reinforced concrete beams using ANSYS will be compared with the experiment. Particularly, the investigated damage cases are cracks in reinforced concrete beams under loads. Finally, we will evaluate the accuracy of the damage diagnosis methods and suggest the location of the vibration data and specify the failure threshold of the methods.

关键词： Damage Detection Vibration Method reinforced concrete beam Natural Frequency Mode Shape

Experimental study on shear behavior of reinforced concrete beams with web horizontal reinforcement

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Frontiers of Structural and Civil Engineering 2014年第4期8卷 325-336页

作者： Dong XU Yu ZHAO Chao LIU Department of Bridge Engineering Tongji University Shanghai 200092 China

In determining the shear capacity of reinforced concrete beams, current codes do not provide any calculation method to evaluate the influence of web horizontal reinforcement, although they exist as structural reinforcements （or skin reinforcement）. The present paper comprises results of 11 reinforced concrete beams in an effort to investigate the influence of web horizontal reinforcement on the shear behavior of reinforced concrete beams. The primary design variables are the shear-span-depth ratio, different reinforcement ratio of stirrups and web horizontal reinforcement. Influence of web horizontal reinforcement on crack patterns and failure mode was studied. It was found that web horizontal reinforcement can increase the shear capacity of the beams and restrain growth of inclined cracks effectively. Test results are very valuable, as very few references of shear tests can be found focusing on the effect of web horizontal reinforcement on the shear capacity of the beams.

关键词： reinforced concrete beam shear strength web horizontal reinforcement experiments

EFFECT OF CORROSION ON BOND BEHAVIOR AND BENDING STRENGTH OF reinforced concrete beamS

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2001年第3期2卷 59-69页

作者：金伟良赵羽习 Department of Civil Engineering Zhejiang University Hangzhou China

There is growing concern for corrosion damage in reinforced concrete structures with several decades’ service. Pullout tests and beam tests were carried out to study the effect of reinforcement corrosion on the bond behavior and bending strength of reinforced concrete beams. The bond strength of plain bars and concrete initially increases with increasing corrosion, then declines. The turning point depends on the cracking of the concrete cover. The bond strength of deformed bars and concrete increases with corrosion up to a certain amount, but with progressive increase in corrosion, the bond strength decreases, and the cracking of the concrete cover seems to have no effect on the bond strength. On the basis of test data, the bond strength coefficient recommended here, which, together with the bond strength of uncorroded steel bars and concrete, can be used to easily calculate the bond strength of corroded steel bars and concrete. The bond strength coefficient proposed in this paper can be used to study the bond stress\|slip relationship of corroded steel bars and concrete. The bending strength of corroded reinforced concrete beams declines with increasing reinforcement corrosion. Decreased bending strength of corroded RC beam is due to reduction in steel bar cross section, reduction of yield strength of steel bar, and reduction of bond capacity between steel bar and concrete.

关键词： reinforced concrete beam corrosion bond behavior bond strength coefficient bending strength coordination coefficient

Investigation of the parameters affecting the behavior of RC beams strengthened with FRP

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 729-743页

作者： Kadir SENGUN Guray ARSLAN Department of Civil Engineering Yildiz Technical UniversityIstanbul 34220Turkey

Three-point bending tests were carried out on nineteen reinforced concrete(RC)beams strengthened with FRP in the form of completely *** strip width to spacing ratios,FRP type,shear span to effective depth ratios,the number of FRP layers in shear,and the effect of stirrups spacing were the parameters investigated in the experimental *** FRP contribution to strength on beams having the same strip width to spacing ratios could be affected by the shear span to effective depth ratios and stirrups *** FRP contributions to strength were less on beams with stirrups in comparison to the tested beams without *** RC beams using FRP could change the failure modes of the beams compared to the reference *** addition to the experimental study,a number of equations used to predict the FRP contribution to the shear strength of the strengthened RC beams were assessed by using a limited number of beams available in the *** effective FRP strain is predicted by using test results,and this prediction is used to calculate the FRP contribution to shear strength in ACI 440.2R(2017)*** on the statistical values of the data,the proposed equation has the lowest coefficient of variation(COV)value than the other equations.

关键词： carbon glass strengthening shear strength reinforced concrete beam fiber reinforced polymer

Experimental Study on the Static and Fatigue Performance of Corroded RC beams Strengthened with AFRP Sheets

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China Ocean Engineering 2010年第3期24卷 539-552页

作者：邓宗才肖锐 The Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of Technology

In order to research the strengthening effects of aramid fiber reinforced polymer （AFRP） sheets on the flexural performance of corroded reinforced concrete （RC） beams, the static and fatigue performance of corroded RC beams strengthened with non-prestressed AFRP sheets under different degrees of corrosion （minor： reinforcement mass loss is 2.0%, medium： reinforcement mass loss is 6.0%） have been researched experimentally in this paper, to compare with that of the control beams （un-strengthened and un-corroded） and un-strengthened corroded beams, and additionally compare with fatigue performance of those medium corroded RC beams strengthened with prestressed AFRP sheets with permanent anchors. The results show that, （1） compared with un-strengthened corroded beams under the same degrees of corrosion, the cracking, yield and ultimate monotonic loads of the minor corroded RC beam strengthened with non-prestressed AFRP sheets is respectively increased by 20%, 27% and 60%, whereas for the medium corroded RC beam strengthened with non-prestressed AFRP sheets increased by 15%, 36% and 83% respectively. The ultimate deflection of the medium corroded beam strengthened with non-prestressed AFRP sheets is 166% larger than that of the corroded un-strengthened beam under the monotonic load. （2） The fatigue life of the non-prestressed AFRP strengthened medium corroded beam is 10.4 times more than that of the un-strengthened corroded beam, but lower than that of the unstrengthened-uncorroded （virgin） beam. （3） Fatigue experiments of the beams strengthened with prestressed AFRP sheets and with those non-prestressed AFRP sheets show that the fatigue life of the retrofit RC beams increase with increasing prestress level of AFRP sheets.（4） The use of AFRP sheets for strengthening corroded RC beams is an efficient technique that can maintain the structural integrity and enhance the structural behavior of such beams.

关键词： corrosion prestressed AFRP sheets flexural performance fatigue reinforced concrete beam

维普期刊数据库

Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration signals

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Frontiers of Structural and Civil Engineering 2011年第1期5卷 112-120页

作者： Zhigen WU Guohua LIU Zihua ZHANG College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310027China

A novel damage assessment method based on the decay ratio of acceleration signals(DRAS)was *** experimental tests were used to show the *** beams were gradually damaged,and then the changes of dynamic parameters were monitored from initial to failure *** addition,a new method was compared with the linear modal-based damage assessment using wavelet transform(WT).The results clearly show that DRAS increases in linear elasticity state and microcrack propagation state,while DRAS decreases in macrocrack propagation *** analysis was developed considering the beat phenomenon in the nonlinear state to explain the turn point of *** better sensibility of damage than modal parameters,probably DRAS is a promising damage indicator in damage assessment.

关键词： damage assessment decay ratio of acceleration signals(DRAS) wavelet transform(WT) modal analysis reinforced concrete beam beat phenomenon

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受纯扭钢筋混凝土组合截面梁的试验研究

福州大学学报(自然科学版) 1985年第2期 98-115页

作者：洪敦枢福州大学土建系

本文根据４７根受纯扭Ｔ形、Ｌ形和Ｉ形梁的试验结果，分析研究了钢筋混凝土组合截面梁，特别是Ｔ形梁的破坏形态、抗裂性、强度和刚度等性能，提出了钢筋混凝土组合截面梁的刚度、开裂扭矩和极限扭矩的计算式．验算了国内外５４根钢... 详细信息

本文根据４７根受纯扭Ｔ形、Ｌ形和Ｉ形梁的试验结果，分析研究了钢筋混凝土组合截面梁，特别是Ｔ形梁的破坏形态、抗裂性、强度和刚度等性能，提出了钢筋混凝土组合截面梁的刚度、开裂扭矩和极限扭矩的计算式．验算了国内外５４根钢筋混凝土Ｔ、Ｌ和Ｉ形梁，计算结果与实测值吻合程度较好．

关键词： reinforced concrete beam COMPOUND SECT- ION TORSION CRACK STIFFNESS STRENGTH