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Journal of Engineering Research (Kuwait) 2024年

作者： Pang, Yafeng Li, Hongjun Han, Zhanchuang Wu, Ping Lin, Hongwei The Key Laboratory of Road and Traffic Engineering Ministry of Education Tongji University Shanghai 201804 China CCCC WuHan Harbour Engineering Design and Research Co. Ltd Wuhan 430040 China CCCC SHEC Wuhan Harbour New Materials Co. Ltd Wuhan 430040 China Hubei Key Laboratory of Advanced Materials and Reinforcement Technology Research for Marine Environment Structures Wuhan 430040 China CCCC First Highway Engineering Group Co. Ltd Beijing 100024 China Inner Mongolia Road and Bridge Group Co. Ltd Hohhot 010051 China

A single-adding fiber technology only plays a role in improving one performance of asphalt mixture such as high temperature or low temperature or water damage performance. Although double-adding fiber-reinforced asphalt mixtures are expected to improve overall road performance, existing research still only focuses on the analysis of a single performance. In this study, two representative fibers including lignin fiber (LF) and ceramic fiber (CF) were selected including to investigate the role of double-adding fibers in asphalt mixtures. The effect of different fiber proportions on the overall road performance of stone matrix asphalt (SMA-13) mixtures was analyzed via wheel tracking tests, low temperature bending test, moisture susceptibility test and fatigue test, etc. The results revealed that the combined addition of LF and CF exhibited superior improvements in mechanical strength, anti-rutting performance, moisture susceptibility, and fatigue life as compared to that of using either fiber alone. Specifically, compared to that of SMA mixtures using LF, the SMA mixtures using both two fibers improved in 11% dynamic stability, 8.6 % low-temperature bending stress, 2.1 % moisture susceptibility and 20 % fatigue life, respectively. And compared to that of SMA mixtures using CF, the mixtures using both two fibers increased in 11 % low-temperature bending strain and 8 % fatigue life, while improving slightly in dynamic stability, low-temperature bending stress, and moisture susceptibility respectively. Based on the results of efficiency coefficient method, the recommended ratio of LF to CF in the asphalt mixture is 1:2, providing a more balanced and comprehensive enhancement of road performances. This study provides a theoretical reference for the engineering application of improving the road performance of asphalt mixture through composite fiber blending, which can effectively enhance the service life of asphalt pavement. © 2023 The Authors

关键词： Asphalt mixture Ceramic Fiber Composite modification Fiber reinforcement Lignin fiber

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Seismic Response of Rocking Double-Column bridge Bents with External Hysteretic Dissipaters

Seismic Response of Rocking Double-Column Bridge Bents with ...

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第五届智能交通、大数据及智慧城市国际会议

作者： Yulong Zhou Jinquan Zhang Shoushan Cheng Haifang He Zhenhua Dong Qiang Han Key Laboratory of old bridge inspection and reinforcement technology industry Research Institute of Highway Science of Transport Ministry Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology

Rocking bent is a potential alternative for seismic resistant and post-earthquake resilience of *** order to study the seismic response of rocking doublecolumn bridge bents with external hysteretic dissipaters,this paper developed an analytical model considering the impact and dissipater *** benefits of dissipaters for rocking bridge bents were validated compared with the free-rocking *** influence of the hysteretic dissipater parameters on the seismic response of rocking bridge bent were also *** analysis considers far-field and near-field earthquake *** study results show that the external hysteretic dissipaters have attractive benefit on the seismic response and stability of rocking double-column bridge *** dissipater fracture and overturning are sensitive to the distinctive pulses of near-field records,which is crucial from the design point of view.

关键词： Rocking Bent Double-Column External Dissipater Seismic response

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Calculation method of creep under decreasing stress considering variation of natural environmental factors

Calculation method of creep under decreasing stress consider...

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作者： Yu Zhao Yan Wang Chuang Song Yongjun Zhou School of Highway Chang'an University Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University

The actual structure is always in the state of natural changing environment and stress decreasing in the section. At present, there is little method for calculating the creep under decreasing stress which takes environmental variation into account. As excessive deflection becomes a serious problem for long span continuous rigid frame bridges during the operation period, in this paper, a creep calculation method is proposed for the continuous decrease of stress in most girder sections, and considers the environmental factors comprehensively. Firstly,the multifactor(temperature, relative humidity and reinforcement ratio) correction was made to creep model of the current code JTG D62. And five creep recovery models were compared and analyzed simultaneously. Based on the elastic creep theory and the superposition principle, the improved creep calculation method was proposed. Then theoretical calculation was carried out for the assumed structure. The results showed that the calculated value obtained by the proposed method were obviously different from those obtained by the code, and were significantly different from those obtained without considering creep recovery, which proves the superiority of the proposed method under the action of multiple environmental factors and decreasing stress.

关键词： Calculation method of creep under decreasing stress considering variation of natural environmental factors

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Comparison and Applicability Research of Prestressed Duct Pumpness Contemporary Major Nondestructive detection technology

Comparison and Applicability Research of Prestressed Duct Pu...

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2018年先进电子材料、计算机与材料工程国际学术会议（AEMCME 2018）

作者： CHEN Jianzhang ZHANG Kechao ZHENG Yi Research Institute of Highway Ministry Transport Key Laboratory of Old Bridge Detection and Reinforcement Technology Ministry of Transport

ISBN: (纸本)9781510874466

Prestressed reinforcement is one of the most hidden and important project in bridge enginerring. It directly determines the structure of the bending, shear, anti vibration, anti impact performance, it also has influence on the safety and durability of the structure. To evaluate old bridge structure, it is required to detect the internal reinforced distribution(quantity, specifications, protection layer thickness). In addtition, due to poor construction quality, position of prestressed tendons biased, and grouting can not get guarantee, which leads to serious corrosion of prestressing tendons, consequently in potential safety hazard. All above indicate that by using nondestructive method, it is significant to locate the prestressed tendon and define the quantative and distribution in structure. Then, it is required to evaluate the grouting condition of prestressed ducts, and regrouting for the flaw ducts. This paper focuses on several current famous prestressed grouting nondestructive detection methods, combining the characteristics of the actual bridge structure, and the accuracy of each method is obtained. Results is compared with applicability and pertinency. Research results provide method and basis for detecting subsequent prestressed bridge.

关键词： red Comparison and Applicability Research of Prestressed Duct Pumpness Contemporary Major Nondestructive detection technology

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Analysis of the Influence of Boundary Conditions on the Mechanical Characteristics of Arch bridge with Composite Arch

Analysis of the Influence of Boundary Conditions on the Mech...

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作者： Changchang Li Ling-ling Wu Shengbo Chai Yu Zhao Yong-jun Zhou School of Highway Chang'an University School of Architecture and Civil Engineering Xi'an University of Science and Technology Key Laboratory for old Bridge Detection and Reinforcement Technology of Ministry of Transportation

Mid-through arch bridge with a composite arch rib of the main arch and vice-arch is novel and reliable in rigidity. It belongs to the high-order statically indeterminate structures, and the boundary form has a great influence on the internal force and deflection of the structure. In this paper, in order to study the influence of different boundary conditions on the static and dynamic characteristics of the structure, relying on a practical project, the static and dynamic characteristics of the bridge under different boundary conditions of the main arch foot are analyzed and compared by using finite element method, which provides scientific basis for the design of the arch bridge with composite arch. The results show that the boundary conditions of the main arch foot have obvious effects on the deflection and internal force of the arch under dead and moving loads, but have little effect on the dynamic characteristics and stability of the bridge.

关键词： Analysis of the Influence of Boundary Conditions on the Mechanical Characteristics of Arch bridge with Composite Arch

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Study on reasonable restraint system of double-deck frame bridge subjected to seismic action

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Journal of Physics: Conference Series 2022年第1期2158卷

作者： XM Zong Y Liu F Yang J Wu XD Wang M Zhou China United Northwest Institute for Engineering Design and Research Co. Ltd 710077 Shanxi China Key Laboratory for Bridge Detection and Reinforcement Technology of the Ministry of Transportation Chang'an University Xi'an 710064 Shanxi China Guangdong Communication Planning &Design Institute Co. Ltd. Guang Zhou 510507 Guang Dong China

In this paper, in order to improve the seismic performance of frame type double deck overpass bridge under seismic action, the most reasonable restraint system of frame double-deck overpass is studied. Based on the typical frame-type double-deck continuous overpass-hushen bridge, the finite element analysis model of the solid bridge is established. Then, from six different directions, eight different constraint combinations are established. Finally, through the analysis of the bridge direction control point of the internal force, displacement and other parameters, research and contrast the frame double-deck overpass under different constraints of the seismic response. The results show that the combination of rubber bearing, steel wire rope and concrete block can effectively limit the relative displacement between piers and beams, and reduce the internal force response of Piers and residual deformation of supports.

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Thermodynamic Stability of Sulfate Ions on Calcium Aluminosilicate Hydrate Microstructure

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Journal of Wuhan University of technology(Materials Science) 2019年第3期34卷 638-647页

作者： HU Chengguang DING Qingjun WANG Huan FENG Xiaoxin College of Materials Science and Engineering North China University of Science and TechnologyTangshan063210China Hubei Key Laboratory of Roadway Bridge and Structure Engineering(Wuhan University of Technology) Wuhan430070China College of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Hubei Communications Investment Intelligent Detection Co. LtdWuhan430051China

The thermodynamic stability of sulfate ions on synthesized calcium aluminosilicate hydrate（C-A-S-H） microstructure with different Ca/Si ratios and Al/Si ratios was investigated by XRD, SEM-EDS, 29 Si and 27 Al nuclear magnetic resonance（NMR） and thermodynamic modeling. The results indicate that sulfate attack leads to both decalcification and dealumination for C-A-S-H gels, and the amount of corrosion products（gypsum and ettringite） decreased gradually with decreasing Ca/Si ratios of C-A-S-H. Sulfate ions can also promote the polymerization degree of C-A-S-H gels, improving its resistance to sulfate attack. Moreover, the 4-coordination aluminum（Al[4]） in C-A-S-H, 5-coordination aluminum（Al[5]）, 6-ccordination aluminum（Al[6]） in TAH（third aluminum hydrate） and Al[6] in monosulfate or C-A-H（calcium aluminate hydrate） can be transformed into Al[6] in ettringite by sulfate attack. Furthermore, through thermodynamic calculation, the decrease of Ca/Si ratios and increase of Al/Si ratios can improve the thermodynamic stability of C-A-S-H gels under sulfate attack, which agrees well with the experiment results.

关键词： sulfate attack calcium aluminosilicate hydrate thermodynamic stability microstructure

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Corrosion characteristics and mechanical properties degradation of stressed high-strength steel wires in acidic environment

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Case Studies in Construction Materials 2025年 22卷

作者： Rujin Ma Ruiquan Su Chuanjie Cui Yi Liu Hao Hu Airong Chen College of Civil Engineering Tongji University Shanghai 200092 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Department of Engineering Science University of Oxford Oxford OX1 3PJ UK Department of Mechanical and Civil Engineering California Institute of Technology Pasadena 91106 United States of America Zhejiang Provincial Key Lab for Detection and Maintenance Technology of Road and Bridge Hangzhou 311305 China

This study investigates the corrosion behavior and degradation of mechanical properties in stressed high-strength steel wires within acidic environment. Based on electrochemical accelerated corrosion testing, the corrosion characteristics of high-strength steel wires under different stress levels and corrosion durations were analyzed. A time-varying prediction formula for the uniform corrosion degree has been established and statistical laws of pitting corrosion characteristics are identified. Furthermore, the tensile test was conducted to summarize the fracture characteristics of the steel wires and analyze the degradation law of mechanical properties. Regression analysis was employed to quantify the relationship between corrosion characteristics and the degradation of mechanical properties and a formula describing the time-dependent degradation of ultimate load was derived. Results show that applied stress markedly hastened diameter reduction of the wires. At the micro level, the dimensions of pits in both dimensions also develop faster under the action of stress, and the width-depth ratio decreases as the stress increases, resulting in pits that deepen rather than widen. At constant stress levels, the elastic modulus of the steel wire remained stable with increased corrosion duration, whereas ultimate strain and ultimate load decreased. These findings enhance the understanding of the corrosion development and mechanical deterioration of high-strength steel wires and can be used to practical engineering for fundamental assessments of corrosion severity and residual strength.

关键词： Corrosion High-strength steel wires Stressed state Mechanical properties

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Simplification of Vertical Live Loading for In-Service bridge Pile Foundation

Simplification of Vertical Live Loading for In-Service Bridg...

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2018 International Conference on Manufacturing technology, Materials and Chemical Engineering, MTMCE 2018

作者： Hu, Juan Gao, Jingjing College of Urban Construction Zhejiang Shuren University Hangzhou310015 China Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Chang'An University College of Highway Xi'an710064 China Shaanxi Railway Institute Weinan714000 China

In order to determine the distribution of live load on the in-service bridge pile, the live load were statistically analyzed that the distribution at the end of the beam at the fulcrum of the beam and the T beam in the middle and small span of the highway bridge, the proportion of live load is obtained in the counter force at the end of the beam. According to the statistical results, the corresponding relationship between the ratio of cyclic loading and the span of highway bridge is established, and according to the traffic volume and the effective number of trips calculated by different types of vehicles, the relation between the number of cyclic loads and the operation time of the bridge pile foundation is analyzed. The above results were combined with the time cycle of the vehicle on the bridge, a simplified calculation model of static load and live load on bridge pile foundation is established, which the obtained results can be directly applied to the test and loading of in-service bridge pile foundation and to guide the single pile model test in the laboratory, and has a strong application value. © Published under licence by IOP Publishing Ltd.

关键词： Highway bridges

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Analysis of Factors Affecting Ductility of Reinforced Concrete Column

Analysis of Factors Affecting Ductility of Reinforced Concre...

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International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Mi Zhou Yongcun Jiang State Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an China

ISBN: (纸本)9781728113678;9781728113661

In order to study the ductility of reinforced concrete columns under the influence of different parameters, six reinforced concrete column models with different design parameters were fabricated based on the pseudo-static test of large-scale reinforced concrete columns. The failure modes of reinforced concrete columns under the influence of different column height, longitudinal reinforcement ratio and chloride ion erosion were studied. The hysteresis curves and skeleton curves obtained from the test were analyzed, and the relationship between the displacement ductility of reinforced concrete columns and three influencing factors was obtained.

关键词： Concrete Hysteresis Skeleton Loading Ions Force Earthquakes

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