Study On Influence Of Different Subgrade Types On Low Temperature Shrinkage Performance Of Asphalt Pavement,
2023
School of Civil Engineering, Northeast Forestry University, Harbin, Heilongjiang 150040, China
Study On Influence Of Different Subgrade Types On Low Temperature Shrinkage Performance Of Asphalt Pavement, Xu Yongli, Guo Yang, Sun Zhiqi
Journal of China & Foreign Highway
To study the influence of different subgrade types on the low-temperature shrinkage performance of asphalt pavement, this paper designed two kinds of asphalt pavement combination structures for the semi-rigid subgrade and flexible subgrade: AC-16+cement-stabilized gravel and AC-16+asphalt-stabilized gravel. Strain gauges were attached at the center of the sides of the two materials and at the characteristic positions of the interfaces between the layers, and the resistance strain gauge measurement method was employed to carry out the temperature shrinkage test of the combined structure and thus obtain the strain changes at each position during the cooling process, with the influence of …
Research On Effect Of Structural System On Static And Dyn Amic Stiffness Of Large-Span And Narrow Suspension Bridges,
2023
Sichuan Communication Surveying & Design Institute Co., Ltd., Chengdu, Sichuan 610017, China
Research On Effect Of Structural System On Static And Dyn Amic Stiffness Of Large-Span And Narrow Suspension Bridges, Song Songke, He Jiayong, Chen Qian, Du Taoming, Li Yongle, Yu Chuanjin
Journal of China & Foreign Highway
Large-span and narrow suspension bridges featuring flexible structures and low overall stiffness have prominent wind resistance problems. Structural static and dynamic stiffness is the basic parameter for wind resistance of long-span bridges. By taking a large-span and narrow suspension bridge as the research project, this paper comparatively analyzed the effects of parameters such as stiffened girder stiffness, main cable span ratio, main cable spacing, and lifting point width on the static and dynamic stiffness based on the theory of spatial cable segmental suspension lines and three-dimensional finite element models of bridges under multi-working condition systems. The results show that the …
Research On Design Method Of Anti-Overturning Stability Of Large Cantilever Steel Truss Beam Traverse Construction Based On Reliability Inversion Theory,
2023
Shandong Weilai High Speed Railway Company Limited, Jinan, Shandong 250102, China
Research On Design Method Of Anti-Overturning Stability Of Large Cantilever Steel Truss Beam Traverse Construction Based On Reliability Inversion Theory, Yang Shusheng, Cui Fengkun, Wang Jiansheng, Su Baozhong, Xu Shaoxia
Journal of China & Foreign Highway
To evaluate the safety of large cantilever steel truss beams in traverse construction, this paper proposed a method of evaluating the safety factor of anti-overturning stability of large cantilever steel truss beams based on the reliability inversion theory. Under the premise of giving the target reliability index and considering the randomness of the structural parameters, this method adopted the reliability inversion theory to solve the anti-overturning safety factor of large cantilever steel truss beams in traverse construction. Finally, the method was utilized to study the anti-overturning stability of the 82 m large cantilever steel truss beam of Weilai High-speed Railway …
Experimental And Simulation Study On Bond Degradation Of Fractured Prestressed Tendons,
2023
Hunan Road & Bridge Construction Group Co., Ltd., Changsha, Hunan 410000, China
Experimental And Simulation Study On Bond Degradation Of Fractured Prestressed Tendons, Yong Pan, Li Cong, Chen Guan, Xiang Dan, Hu Xianwei, Qi Honghe
Journal of China & Foreign Highway
To solve the corrosion and fracture of prestressed tendons in the end-anchor area of post-tensioned prestressed concrete (PC) girders under the chlorine salt environment, this paper employed electrochemically accelerated corrosion tests to obtain three PC members after the fracturing of prestressed tendons in the end-anchor area, and then carried out the static drawing test to study the effects of concrete strength and stirrup diameter on the bonding performance of prestressed tendons after fracturing. The results show that the bond damage of the strands starts at the drawing end and gradually develops to the free end. Additionally, increasing the concrete strength …
Parameters Study On Durability Of Substation Structure Of Multi-Tower Suspension Bridge,
2023
Wenzhou Oujiang Beikou Bridge Company, Wenzhou, Zhejiang 325000, China
Parameters Study On Durability Of Substation Structure Of Multi-Tower Suspension Bridge, Qin Xiao, Pan Ji, Xiao Rucheng
Journal of China & Foreign Highway
Substation structures are important components of the bridge structure, and their durability will affect the service life of the overall bridge structure. Since the overall structure of a multi-tower suspension bridge is more flexible with larger deformation, and the cumulative displacement at the substation structure is also larger, the durability problem of the substation structure is more prominent under multi-tower suspension bridges. To qualitatively analyze the influence of the structural parameters of the bridge structure (including tower-beam connection and cable-beam connection methods) on the durability of the substation structure, this paper built a finite element model of a four-tower suspension …
Influence Of Shear Deformation On Manufacturing And Erection Alignment,
2023
School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Influence Of Shear Deformation On Manufacturing And Erection Alignment, Wang Jin, Chen Changsong
Journal of China & Foreign Highway
This paper aims to study the effect of shear deformation on the manufacturing and erection alignment of main girders of free cantilever erection steel box girder bridges and better design the state of bridge formation state. To this end, it calculated the shear stress coefficient of uniformity of the steel box girder’s cross-section by adopting the finite element method and conducted comparison with the solid model of the plate and shell units of the steel box girder. The results show that the shear stress coefficient of uniformity calculated by finite element software is accurate and reliable. Additionally, simple modeling indicates …
Study On Temperature Gradient Of Long-Span Single-Box Double-Chamber Box Girder Bridge,
2023
China Railway 12th Bureau Group Co., Ltd., Taiyuan, Shanxi 030024, China
Study On Temperature Gradient Of Long-Span Single-Box Double-Chamber Box Girder Bridge, Yang Wenbin
Journal of China & Foreign Highway
In view of the complex temperature effect of the single-box double-chamber box girders, this paper aimed to carry out the temperature gradient study of box girder cross-sections by employing a short-tower single-box double-chamber cable-stayed bridge with span arrangement of (120+120) m. 21 temperature sensors were installed at the cross-sections of large-mileage closure sections, with the set collection frequency of one time per hour and a wireless collection module for data collection. Meanwhile, temperature observation was carried out for a period of 171 d to obtain the distribution law of the temperature gradient in cross-sections of the closure sections. The study …
Study And Implementation Of Jacking Scheme Of Vertical Curve Beam With Two -Way Longitudinal Slope Without Adjusting Temporary Pier Top Elevation,
2023
CCCC Changsha Construction Co., Ltd., Changsha, Hunan 410200, China
Study And Implementation Of Jacking Scheme Of Vertical Curve Beam With Two -Way Longitudinal Slope Without Adjusting Temporary Pier Top Elevation, Zhang Hongwu, Ke Hongjun, Chen Zhuoyi, Yang Wu
Journal of China & Foreign Highway
The bridge alignment design is the straight line+circular curve+straight two-way longitudinal slope vertical curve variable curvature steel bridge jacking. To deal with this problem, this paper analyzed the shortcomings of existing schemes such as real-time or multiple adjustments to the temporary pier top elevation, and proposed a jacking scheme of taking full advantage of the steel bridge’s characteristics including small flexural rigidity, strong adaptive deformation ability and high material strength, without adjusting the temporary pier top elevation. Additionally, the whole-process finite element simulation analysis was conducted on this scheme via a background project, with the calculation results revealing safety and …
Optimization Of Bridge Life Cycle Maintenance Decision Based On Lca And Lcc,
2023
Hunan Road & Bridge Construction Group Co., Ltd., Changsha, Hunan 410004, China
Optimization Of Bridge Life Cycle Maintenance Decision Based On Lca And Lcc, Liu Shuguang, Liu Jun, Liu Yonghua, Wang Fan
Journal of China & Foreign Highway
To study the optimal maintenance strategy for bridges over the whole life cycle under the influence of life cycle environment and life cycle cost, this paper built a multi-objective optimization model for bridge life cycle maintenance decision by adopting preventive maintenance and substantial maintenance as the basic maintenance methods, and bridge reliability, life cycle environment and life cycle cost as the objective functions. Additionally, it derived the quantification method of indicators including the time-varying reliability, life cycle environment and life cycle cost indicators of the bridge, and determined the computational process of bridge life cycle maintenance decision optimization based on …
Experimental Study On The Influence Of Cantilevered Sidewalk On The Wind Resistance Of A Cable-Stayed Bridge With Pk Girder,
2023
Guangxi CCCC First Highway Engineering Group Pingrong Expressway Co., Ltd., Guigang, Guangxi 537110, China
Experimental Study On The Influence Of Cantilevered Sidewalk On The Wind Resistance Of A Cable-Stayed Bridge With Pk Girder, Yu Zhenghua
Journal of China & Foreign Highway
Bilateral box steel main girders are widely employed in large-span double-plane cable-stayed bridges. These bridges are characterized by low frequency, small damping, and relatively light mass, and their wind resistance stability is a key problem to be solved in bridge construction. By taking the Pingnan super major cable-stayed bridge with a main span of 636 m on Pingrong Expressway under construction as the research project, this paper built a finite element spatial model of the bridge and analyzed the structural modal characteristics. Meanwhile, it carried out the main girder segmental model of elastically suspended vortex vibration and chatter vibration wind …
Data Analysis And Early Warning Platform For Bridge Health Monitoring Based On Matlab-Java Fusion,
2023
Shenzhen High Speed Engineering Consulting Co., Ltd., Shenzhen, Guangdong 518000, China
Data Analysis And Early Warning Platform For Bridge Health Monitoring Based On Matlab-Java Fusion, Wang Zhiwen, Mao Yongjia, Ding Youliang
Journal of China & Foreign Highway
Bridge health monitoring provides important support for daily operation and maintenance management of bridges. Meanwhile, real-time analysis, evaluation and early warning of bridge health monitoring data are the core requirements for enhancing bridge monitoring and safety protection, which can help grasp the operation status of bridge structures in real time and guard against major safety risks of bridge operation. This paper combined traditional signal processing and statistical analysis with modern machine learning and deep learning, and developed a platform for real-time analysis and warning of bridge health monitoring data based on Matlab-JAVA integration. Online cleaning, feature extraction, performance evaluation and …
Study On Long-Lasting Anticorrosive Primer For Steel Deck Paveme Nt In Marin E Environment,
2023
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400026, China; Chongqing Special Paving Engineering Technology Co., Ltd., Chongqing 400026, China
Study On Long-Lasting Anticorrosive Primer For Steel Deck Paveme Nt In Marin E Environment, Yan Dongbo, Zhuang Yongyi, Liu Yan, Chen Zhenfu, Ceng Deliang
Journal of China & Foreign Highway
In steel deck pavement, after the occurrence of local diseases, steel plates are prone to rapid rust to exacerbate the disease development. To this end, based on the waterproof adhesive system of polymethyl methacrylate resin for steel deck pavement under the marine environment, this paper adopted the organosilicone-modified epoxy resin as the main raw material, which was combined with the cashew phenol-modified phenolic amine and polyamide mixed curing agent. Meanwhile, this paper added a new type of environmentally friendly rust prevention pigment to produce the long-lasting anticorrosive primer for steel deck pavement. The technical requirements of the long-lasting anticorrosive primer …
Research On Structural Design Of Steel-Uhpc Light Composite Beam Of Large-Span Self-Anchored Suspension Bridge,
2023
Hunan Provincial Communications Planning, Survey & Design Institute Co., Ltd., Changsha, Hunan 410219, China
Research On Structural Design Of Steel-Uhpc Light Composite Beam Of Large-Span Self-Anchored Suspension Bridge, Zhang Xin, Li Yu, Liu Yong
Journal of China & Foreign Highway
To optimize the structural scheme of steel-ultra-high performance concrete (steel-UHPC) light composite stiffening beams for large-span self-anchored suspension bridges, by taking the Qinglongzhou Bridge in Yiyang as the research object, this paper employed finite element simulation and full-scale tests to compare and verify three steel-UHPC composite stiffening beam schemes, and compare the indicators such as static behavior and economic properties. The results show that the UHPC stiffened girder is the best choice for the structural performance and economic characteristics. The results show that the UHPC waferboard, UHPC longitudinal rib plate without web reinforcement, UHPC longitudinal rib plate with long bolts …
Key Technology Of Demolition And Reconstruction Design Of Wudou Bridge,
2023
Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou, Henan 450052, China
Key Technology Of Demolition And Reconstruction Design Of Wudou Bridge, Li Huaqiang
Journal of China & Foreign Highway
Bridges constructed between the 1960s and 1970s have been damaged to different degrees during operation due to excessive traffic flow and severe overloading of vehicles, and thus cannot meet the requirements for safe passage of vehicles and navigation. Therefore, they need to be demolished and rebuilt. To safely, economically and efficiently demolish the old bridges and rebuild them in-situ, this paper studied a design concept of integrated construction and demolition. Based on the Wudou Bridge demolition and reconstruction project in Foshan, the combination of theoretical analysis and computational simulation was utilized to conduct a multi-scheme study from the perspectives of …
Analysis Of Internal Force And Deformation Of Double-Row Steel Sheet Pile Cofferdam In Different Working Conditions,
2023
CCCC Tunnel Engineering Company Limited, Nanjing, Jiangsu 211100, China
Analysis Of Internal Force And Deformation Of Double-Row Steel Sheet Pile Cofferdam In Different Working Conditions, Yang Qin, Fang Zhongqiang, Liu Yi, Tu Qiliang
Journal of China & Foreign Highway
To understand the internal force and deformation generation mechanism of the double-row steel sheet pile cofferdam in complex stress conditions and determine the most unfavorable working condition, this paper adopted the finite element method to analyze the displacement, axial force of steel tie bars and bending moments of steel sheet piles in various construction stages at different water levels and under different load types. The study shows that the deformation and internal force of the cofferdam are affected by the water level, fill light weight, vertical construction load, horizontal wave load, and wind load. The most unfavorable conditions for displacement …
Design Of Prefabricated Deep-Water Combined Steel Sheet Pile Cofferdam,
2023
Key Laboratory of Large-span Bridge Construction Technology, Ministry of Transport, CCCC Second Harbor Engineering Company Ltd., Wuhan, Hubei 430040, China
Design Of Prefabricated Deep-Water Combined Steel Sheet Pile Cofferdam, Fu Su, Ceng Jian, Yang Suhai, Wang Chao, Deng Songtao
Journal of China & Foreign Highway
By taking the pier bearing platform 9# of the non-navigable bridge in the eastern flood-relief area of Shenzhen-Zhongshan Link as the research project, this paper introduced the cofferdam structure of prefabricated combined steel sheet piles using the support-first construction process from the aspects of the cofferdam structural form, cross-section type of steel sheet piles, construction process, and support system, and adopted the finite element method to numerically analyze the whole cofferdam construction process. The combined cross-section of cap-shaped steel sheet piles and H-shaped steel greatly improves the rigidity of steel sheet piles. Additionally, the construction process of the support-first method …
Performance Analysis Of Steel Bridge Deck Reinforced By Uhpc Based On Fracture Mechanics,
2023
Guangdong Communication Planning & Design Institute Group Co., Ltd., Guangzhou, Guangdong 510080, China
Performance Analysis Of Steel Bridge Deck Reinforced By Uhpc Based On Fracture Mechanics, Long Yiyu, Chen Shuangqing, Tang Chunyan, Peng Yajun, Zhou Zejian
Journal of China & Foreign Highway
At the deck-rib welding joints of orthotropic steel bridge decks, cracking can easily occur under the vehicle load, and the fatigue risk of steel bridge decks can be effectively reduced by UHPC reinforcement. To investigate the effect of UHPC-reinforced steel bridge decks, this paper carried out finite element analysis based on linear-elastic fracture mechanics. By taking the orthotropic steel bridge deck test as the reference, the fatigue performance at the weld toe was calculated, and the reliability of the finite element model was verified. Stress intensity factor calculation analysis was performed by inserting an initial crack at the weld detail, …
Structure Design Of Platform For Construction Of Inclined Pile Foundation On The Water Under Complex Hydrogeology Conditions,
2023
CCCC Second Harbor Engineering Company Ltd., Wuhan, Hubei 430014, China; Key Laboratory of Large-span Bridge Construction Technology, Ministry of Transport, Wuhan, Hubei 430014, China; Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of
Transport Infrastructure, Wuhan, Hubei 430014, China
Structure Design Of Platform For Construction Of Inclined Pile Foundation On The Water Under Complex Hydrogeology Conditions, Cheng Tao, Fu Su, Deng Songtao
Journal of China & Foreign Highway
Based on the design of the pile foundation construction platform for the Yushan water intake in Daishan Port, this paper introduced the adoption of the support system combining the steel pile casing and steel pipe piles in complex hydrogeological conditions. Most of the pile foundations feature small embedded length and are inclined piles with weak lateral rigidity, and they cannot resist the horizontal loads such as wind-wave-current during the typhoon period. Therefore, this paper introduced several measures taken to improve the overall lateral stability of the platform. The first measure is to improve the boundary conditions of pile foundations by …
Orthogonal Analysis Of Influential Factors In Construction Of Portal Pier Foundations Adjacent To Existing Railway,
2023
School of Civil Engineering and Architecture, Nanchang Jiaotong Institute, Nanchang, Jiangxi 330013, China
Orthogonal Analysis Of Influential Factors In Construction Of Portal Pier Foundations Adjacent To Existing Railway, Li Minghua, Feng Jiahui, Han Wenjing
Journal of China & Foreign Highway
To study the influencing factors of portal pier foundation construction adjacent to existing railway, this paper adopted the orthogonal test method based on numerical simulation to study the influence of five factors on the existing railway, including the length of bored piles, construction sequence of bored piles, excavation depth of foundation pits of the bearing platform, length of steel sheet piles, and number of steel sheet piles. The results show that during the bored pile construction stage, the most important factor is the construction sequence of bored piles. Meanwhile, during the stage of foundation pit excavation and substructure construction, the …
Stress Analysis And Monitoring Of Composite Cable Hanging Basket During Construction,
2023
School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215011, China
Stress Analysis And Monitoring Of Composite Cable Hanging Basket During Construction, Zhou Su, Li Xinsheng, Liu Chentao, Shao Mingjie
Journal of China & Foreign Highway
Composite cable hanging baskets are also known as front and rear pivot combined hanging baskets. By taking the construction monitoring of a single-tower and double plane cable-stayed bridge as the research project, this paper demonstrated the rationality, practicability and advancement of the composite cable hanging baskets during construction, and carried out modeling analysis of the whole construction stage. Meanwhile, the batch tension values of the construction sections were determined according to the deformation of the hanging basket during the construction stage, and then the theoretical and measured values of the basket’s deformation and stress during the construction stage were analyzed …
