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flexural behavior of high-strength,steel-reinforced,and prestressed concrete beams

Frontiers of Structural and Civil Engineering 2021年第1期15卷 227-243页

作者： Qing JIANG Hanqin WANG Xun CHONG Yulong FENG Xianguo YE School of Civil and Hydraulic Engineering Hefei University of TechnologyHefei 230009China Anhui Key Laboratory of Civil Engineering and Materials Hefei 230009China College of Water Conservancy and Civil Engineering Xinjiang Agricultural UniversityUrumqi 830052China

To study the flexural behavior of prestressed concrete beams with high-strength steel reinforcement and high-strength concrete and improve the crack width calculation method for flexural components with such reinforcement and concrete,12 specimens were tested under static *** failure modes,flexural strength,ductility,and crack width of the specimens were *** results show that the failure mode of the test beams was similar to that of the beams with normal reinforced concrete.A brittle failure did not occur in the *** further understand the working mechanism,the results of other experimental studies were collected and *** results show that the normalized reinforcement ratio has a greater effect on the ductility than the concrete *** cracking-and peak-moment formulas in the code for the design of concrete(GB 50010-2010)applied to the beams were both found to be ***,the calculation results of the maximum crack width following GB 50010-2010 and EN 1992-1-1:2004 were considerably *** the context of GB 50010-2010,a revised formula for the crack width is proposed with modifications to two major factors:the average crack spacing and an amplification coefficient of the maximum crack width to the average *** mean value of the ratio of the maximum crack width among the 12 test results and the relative calculation results from the revised formula is 1.017,which is better than the calculation result from GB ***,the new formula calculates the crack width more accurately in high-strength concrete and high-strength steel reinforcement ***,finite element models were established using ADINA software and validated based on the test *** study provides an important reference for the development of high-strength concrete and highstrength steel reinforcement structures.

关键词： high-strength steel reinforcement high-strength concrete flexural behavior crack width

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Interconnected microstructure and flexural behavior of Ti_(2)C-Ti composites with superior Young’s modulus

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2088-2101页

作者： Fengbo Sun Rui Zhang Fanchao Meng Shuai Wang Lujun Huang Lin Geng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China

To enhance the Young’s modulus(E)and strength of titanium alloys,we designed titanium matrix composites with intercon-nected microstructure based on the Hashin-Shtrikman *** to the results,the in-situ reaction yielded an interconnected microstructure composed of Ti_(2)C particles when the Ti_(2)C content reached 50vol%.With widths of 10 and 230 nm,the intraparticle Ti lamellae in the prepared composite exhibited a bimodal size distribution due to precipitation and the unreacted Ti phase within the grown Ti_(2)C *** composites with interconnected microstructure attained superior properties,including E of 174.3 GPa and ultimate flexural strength of 1014 *** with that of pure Ti,the E of the composite was increased by 55% due to the high Ti_(2)C content and interconnected *** outstanding strength resulted from the strong interfacial bonding,load-bearing capacity of interconnected Ti_(2)C particles,and bimodal intraparticle Ti lamellae,which minimized the average crack driving *** flexural tests revealed preferential crack initiation along the{001}cleavage plane and grain boundary of Ti_(2)C in the region with the highest tensile *** addition,the propagation can be efficiently inhibited by interparticle Ti grains,which prevented the brittle fracture of the composites.

关键词： titanium matrix composites titanium carbide interface Young’s modulus flexural behavior

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Research on flexural behavior of Coral Aggregate Reinforced Concrete Beams

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China Ocean Engineering 2018年第5期32卷 593-604页

作者： MA Hai-yan DA Bo YU Hong-fa WU Zhang-yu Department of Civil Engineering Nanjing University of Aeronautics and Astronautics

Through the flexural behavior test of coral aggregate reinforced concrete beams(CARCB) and ordinary Portland reinforced concrete beams(OPRCB), and based on the parameters of concrete types, concrete strength grades and reinforcement ratios, the crack development, failure mode, midspan deflection and flexural capacity were studied, the relationships of bending moment-midspan deflection, load-longitudinal tensile reinforcement strain, load-maximum crack width were established, and a calculation model for the flexural capacity of CARCB was suggested. The results showed that with the increase in the reinforcement ratio and concrete strength grade, the crack bending moment(Mcr)and ultimate bending moment(Mu) of CARCB gradually increased. The characteristics of CARCB and OPRCB are basically the same. Furthermore, through increasing the concrete strength grade and reinforcement ratio, Mcr/Mu could be increased to delay the cracking of CARCB. As the load increased, crack width(w) would also increase. At the beginning of the loading, w increased slowly. And then it increased rapidly when the load reached to the ultimate load, which then led to beam failure. Meanwhile, with a comprehensive consideration of the effects of steel corrosion on the loss of steel section and the decrease of steel yield strength, a more reasonable calculation model for the flexural capacity of CARCB was proposed.

关键词： coral aggregate reinforced concrete beam flexural behavior steel corrosion reinforcement ratio concrete strength calculation model

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Characterization of the flexural behavior of Bamboo Beams

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Journal of Renewable Materials 2021年第9期9卷 1571-1597页

作者： Limin Tian Jianpeng Wei Jiping Hao Qiushuo Wang School of Civil Engineering Shaanxi Key Laboratory of Structure and Earthquake ResistanceXi’an University of Architecture and TechnologyXi’an710055China The Key Laboratory of Plateau Building and Eco-Community in Qinghai Qinghai Building and Materials Research Co.Ltd.Xining810008China Anhui Province Key Laboratory of Green Building and Assembly Construction Anhui Institute of Building Research&DesignHefei230031China

Bamboo is a renewable and environmentally friendly material often used for *** study investigates the flexural behavior of bamboo beams through theoretical and finite element(FE)*** the material’s nonlinearity,a method of calculating load-deflection curves is proposed and validated via FE *** interfacial slippage dominated by the shear stiffness of the interface between two bamboo poles significantly influences the flexural behavior of double-pole bamboo ***,the load-deflection curves for different shear stiffnesses can be obtained via theoretical and FE ***,a novel configuration using diagonal steel bands to avoid slippage is *** inclination angle of 45°is suggested to adequately develop the stiffness and bearing capacity of the steel band.

关键词： Bamboo beam flexural behavior interfacial slippage steel band FE analysis

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Improvement of Cracking-resistance and flexural behavior of Cement-based Materials by Addition of Rubber Particles

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 579-583页

作者： KANG Jingfu JIANG Yongqi School of Civil Engineering Tianjin University Tianjin 300072 China

By ring test and bend test, the improvement of waste tire rubber particles on the crack- resistance and flexural behaviors of cement-based materials were investigated. Test results show that the cracking time of the ring specimens can be retarded by the incorporation of rubber particles in the cement paste and mortar. The improvement in the crack-resistance depended on the rubber fraction. When the rubber fraction was 20% in volume, the cracking time was retarded about 15 h for the paste and 24 d for the mortar respectively. flexural properties were evaluated based on the bend test results for both mortar and concrete containing different amount of rubber particles. Test results show that rubberized mortar and concrete specimens exhibit ductile failure and significant deformation before fracture. The ultimate deformations of both mortar and concrete specimen increase more than 2-4 times than control specimens.

关键词： composite material rubberized concrete cracking-resistance flexural behavior

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flexural behavior of reinforced concrete beams with high performance fiber reinforced cementitious composites

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Journal of Central South University 2019年第9期26卷 2609-2622页

作者： SIVA Chidambaram R PANKAJ Agarwal CSIR-Central Building Research Institute Roorkee 247667India Department of Earthquake Engineering Indian Institute of Technology RoorkeeRoorkee 247667India

This article presents an experimental study on the flexural performance of reinforced concrete(RC)beams with fiber reinforced cementitious composites(FRCC)and hybrid fiber reinforced cementitious composites(HFRCC)in the hinge *** specimens with moderate confinement were used in the study and tested under monotonic *** diverse types of FRCC including hybrid composites using fibers in different profiles and in different volumes are employed in this *** specimens such as cylindrical specimens and prism specimens are also used to study the physical properties of composites *** moment?curvature,stiffness behavior,ductility,crack pattern and modified flexural damage ratio are the main factors considered in this study to observe the efficacy of the employed hybrid *** experimental outputs demonstrate the improved post yield behavior with less rate of stiffness degradation and better damage tolerance capacity than conventional technique.

关键词： reinforced concrete beams fiber reinforced composites flexural behavior flexural damage ratio

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Experimental Study on flexural behavior of Corroded Channel Steel Beams

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Journal of Donghua University(English Edition) 2015年第5期32卷 864-869页

作者：于峰武萍 School of Civil Engineering Anhui University of Technology

In order to study the mechanical behavior of corroded channel steel beam,experiment on five corroded channel steel beams is carried out. Test results show that the bending failures may occur under the ultimate load carrying capacity of members,compared with the calculating results of non-corrosion channel steel beam,and the bearing capacity of corroded channel steel beam is reduced,while the deflection is increased. With the increase of shear-span ratio,the bearing capacity of corroded channel steel beam reduces and the deflection increases gradually; with the increment of heightspan ratio, the bearing capacity increases and the deflection decreases gradually; with the enhancement of width-height ratio,the bearing capacity reduces and the deflection-span ratio increases gradually. The measured results indicate that the load-deflection relationship curves of corroded channel steel beam may be divided into four sections: the exfoliated rust layer stage,the elastic stage,the yielding stage and the descending stage. The load-strain relationship curves include two sections: the elastic stage and the yielding stage. The strain measurement of web proves that the average strains agree well with the assumption of plane section. This paper could provide some scientific bases for the maintenance and reinforcement of the corroded steel structure.

关键词： steel structure corrosion flexural behavior experimental study bearing capacity

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Experimental Study on flexural behavior of Post-Tensioning Bonded Partially Prestressed Ultra-High Strength Concrete Beams

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 94-102页

作者： Jinqing Jia Gang Meng Institute of Structural Engineering Dalian University of Technology

This paper presents the results of four partially prestressed ultra-high strength concrete beams in flexure. The test results are used to evaluate the effects of prestressing tendon depth and area on flexure behavior of specimen beams. The test results indicate that: the cracking load,yielding load,peak load and stiffness postcracking of specimen beams are enhanced by reducing prestressing tendon depth or increasing prestressing tendon area, and the flexural ductility is improved by increasing prestressing tendon depth or reducing prestressing tendon area. The effect of complex reinforcement index considering the strength of the equivalence principle and the reinforcement position on loading levels under serviceability limit state,flexural strength and displacement ductility factor are studied. The influence coefficient of prestressing tendon kpis introduced in the complex reinforcement index. As the complex reinforcement index increases, the loading levels under serviceability limit state and flexural strength increases linearly,and the displacement ductility factor decreases linearly. The test results also verify the conventional beam flexural theory based on the plane cross-section assumption for predicting ultimate flexural strength of partially prestressed ultra-high strength concrete beams is valid. After the introduction of the coefficient kp,the calculation method of cracks in code for design of concrete structure in china are appropriated for the specimen beams.

关键词： partially prestressed ultra-high strength concrete flexural behavior ductility serviceability limit state

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An experimental study on the flexural behavior of heavily steel reinforced beams with high-strength concrete

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Frontiers of Structural and Civil Engineering 2014年第1期8卷 46-56页

作者： Yasser SHARIFI Ali Akbar MAGHSOUDI Department of Civil Engineering Vali-e-Asr University ofRafsanjan Rafsanjan Iran Department of Civil Engineering Shahid Bahonar University of Kerman Kerman Iran

In recent years, an emerging technology termed high-strength concrete （HSC） has become popular in construction industry. Present study describes an experimental research on the behavior of high-strength concrete beams in ultimate and service state. Six simply supported beams were tested, by applying comprising two symmetric concentrated loads. Tests are reported in this study on the flexural behavior of high-strength reinforced concrete （HSRC） beams made with coarse and fine aggregate together with Microsilica. Test parameter considered includes effect of being compressive reinforcement. Based on the obtained results, the behavior of such members is more deeply reviewed. Also a comparison between theoretical and experimental results is reported here. The beams were made from concrete having compressive strength of 66.81-77.72 N/mm2 and percentage reinforcement ratio （P/Pb） in the range of 0.56% - 1.20%. The ultimate moment for the tested beams was found to be in a good agreement with that of the predicted ultimate moment based on ACI 318-11, ACI 363 and C SA-04 provisions. The predicted deflection based classical formulation based on code provisions for serviceability requirements is found to underestimate the maximum deflection of HSC reinforced beams at service load.

关键词： high-strength concrete (HSC) members flexural behavior reinforced concrete experimental results ultimatemoment

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flexural behavior of steel reinforced engineered cementitious composite beams

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Journal of Southeast University(English Edition) 2019年第1期35卷 72-82页

作者： Dong Bingqing Pan Jinlong Lu Cong Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education Southeast UniversityNanjing 210096China

In order to enhance the durability of steel encased concrete beams, a new type of steel reinforced engineered cementitious composite(SRECC) beam composed of steel shapes, steel bars and ECC is proposed. The theoretical analyses of the SRECC beam including crack propagation and stress-strain distributions along the depth of the composite beam in different loading stages are conducted. A theoretical model and simplified design method are proposed to calculate the load carrying capacity. Based on the proposed theoretical model, the relationship between the moment and corresponding curvature is derived. The theoretical results are verified with the finite element analysis. Finally, an extensive parametric study is performed to study the effect of the matrix type, steel shape ratio, reinforced bar ratio, ECC compressive strength and ECC tensile ductility on the mechanical behavior of SRECC beams. The results show that substitution concrete with ECC can effectively improve the bearing capacity and ductility of composite beams. The steel shape and longitudinal reinforcement can enhance the loading carrying capacity, while the ductility decreases with the increase of steel shape ratio. ECC compressive strength has significant effects on both load carrying capacity and ductility, and changing the ultimate strain of ECC results in a very limited variation in the mechanical behavior of SRECC beams.

关键词： engineered cementitious composite(ECC) steel reinforced ECC(SRECC) composite beam flexural behavior ultimate load-carrying capacity

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