Analysis On Local Relative Deformation Of Vertical And Horizontal Split Block Section Of Ultra Wide Steel Box‐Girder,
2023
CCCC Second Harbor Engineering Company Ltd., Wuhan, Hubei 430000, China; 2. Key Laboratory of Transportation Industry for Long Bridge Construction Technology, Wuhan, Hubei 430000, China; 3. Transportation Infrastructure Intelligent Manufacturing Technology R&D Center, Beijing 100011, China
Analysis On Local Relative Deformation Of Vertical And Horizontal Split Block Section Of Ultra Wide Steel Box‐Girder, Liu Li, Peng Chengming, Luo Hang
Journal of China & Foreign Highway
In order to meet the requirement that the channel should not be occupied during the construction of the 4th Bridge over the Panama Canal, an innovative construction scheme was proposed for the erection of the ultra-wide overweight steel box girder with central double cable planes (standard section length of 13 m, width of 51 m, and weight of about 370 t), or in other words, the steel box girder was divided into two horizontal segments after vertical segmentation and then horizontally lifted onto the bridge deck through the cable tower. The steel box girder was moved to the bridge deck …
Design And Experimental Study On Special Spherical Support Of Pingtang Bridge,
2023
Guizhou Transportation Planning Survey & Design Academe Co. Ltd, Guiyang, Guizhou 550081, China
Design And Experimental Study On Special Spherical Support Of Pingtang Bridge, Tang Zhi, Ma Baihu, Du Bin, Xu Xiangdong, Xia Junyong
Journal of China & Foreign Highway
The vertical bearing capacity of the 16# pier of Pingtang Bridge is 10 000 kN, and the horizontal bearing capacity along the bridge is 12 000 kN, which is 120% of the vertical bearing capacity. The support angle needs to reach the technical parameter requirements of 0.05 rad, which far exceeds the requirements of 10–40% horizontal force of conventional highway supports. According to the specific engineering situation, a new type of support with a large horizontal bearing capacity was designed. Firstly, the finite element model of the support was established to analyze the mechanical properties of the support, and the …
Study On Practical Method Of Safety Assessment For Bridges Under Heavy‐Cargo Transportation,
2023
Jilin Provincial Transport Scientific Research Institute, Changchun, Jilin 130012, China; 2. Jilin Provincial Expressway Group Co., Ltd, Changchun, Jilin 130022, China
Study On Practical Method Of Safety Assessment For Bridges Under Heavy‐Cargo Transportation, Jiang Xu, Wang Wanfeng, He Zhensheng, Gao Xuefeng
Journal of China & Foreign Highway
In order to meet the requirements of the industry for the high efficiency, safety, and reliability of the traffic safety assessment of heavy-duty vehicles, this paper proposed a method that combined a real-time monitoring system with a finite element method for the traffic safety assessment of heavy-duty vehicles on bridges and verified the method through practical projects. The paper evaluated the bridge’s technical condition level before the heavy-duty vehicle passes and determined the resistance reduction factor considering the bridge’s technical condition level. The finite element analysis model of the bridge was established, and the reliability of the model was verified …
Research On Vibration Reduction Measures Of Short‐Hole Blasting For Pile Group Foundation Of Bridge,
2023
Guizhou Highway Engineering Group Co., Ltd., Guiyang, Guizhou 550008, China
Research On Vibration Reduction Measures Of Short‐Hole Blasting For Pile Group Foundation Of Bridge, Long Lidun, Ji Zhongyan, Li Shaofang, Zhou Xu
Journal of China & Foreign Highway
In the construction of pile hole blasting of group pile foundation of bridges, due to the small clear distance between piles, the blasting vibration will have adverse effects on the wall protection of adjacent pile holes and the poured pile core concrete. Measures thus should be taken to control the seismic wave vibration velocity. In view of the inapplicability of conventional blasting vibration reduction measures such as reducing charge and setting isolation ditch in the construction of pile group foundation of the bridge, this paper proposed vibration reduction measures such as setting isolation holes and using air bags to replace …
Installation Construction Technology Of Composite Girder Cable‐Stayed Bridge Superstructure In Deep‐Cutting Gorge,
2023
CCCC Second Harbor Engineering Company Ltd., Wuhan, Hubei 430040, China
Installation Construction Technology Of Composite Girder Cable‐Stayed Bridge Superstructure In Deep‐Cutting Gorge, Ren Lei, Lu Liang, Dong Zhengliang
Journal of China & Foreign Highway
In view of the installation problems of superimposed beam cable-stayed bridge across the deep canyon, this paper studied the superimposed beam lifting, transport on beam, and superimposed beam installation and proposed three kinds of lifting technology with tower truss crane, beam lifting door crane, and large tower crane, as well as two kinds of installation technology including piecemeal assembly by full rotating deck crane and whole segment assembly truss deck crane. It also made a relative comparative analysis, solving the difficulty in vertical lifting on such bridges and providing a reference for the construction of the same type of cable-stayed …
Research And Analysis On Controlled Blasting Demolition Of Continuous Thin‐Walled Box Ribbed Arch Bridge,
2023
Beijing Municipal Construction Engineering Co., Ltd., Beijing 100083, China
Research And Analysis On Controlled Blasting Demolition Of Continuous Thin‐Walled Box Ribbed Arch Bridge, Ma Shaojun, Chen Huibin, Chai Wendong, Zhang Chunquan, Wang Yuan
Journal of China & Foreign Highway
The 1st bridge of the Jialing River in Pengan County is erected over the Jialing River, a tributary of the Yangtze River. Due to earthquakes and perennial high load operation, the overall technical condition is “Class Ⅴ”, which cannot meet the requirements of the design load grade. This bridge is the longest highway bridge dismantled in Sichuan Province. Its structure is a multi-span continuous thin-walled box ribbed arch bridge. In addition, there are obvious diseases, so the demolition is difficult, and the safety risk is great. For the demolition of the bridge by controlled blasting, numerical simulation, shaped charge cutting …
Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert,
2023
Shanxi Transportation Planning, Survey and Design Institute Co., Ltd., Taiyuan, Shanxi 030012, China
Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert, Zhang Haijun
Journal of China & Foreign Highway
In order to explore the parameter effect of a composite arch culvert with corrugated steel plate and concrete, based on the engineering background of a composite arch culvert, the influence rules of four parameters, namely fill height, pipe diameter, wall thickness, and uneven settlement, on the stress and deformation of the arch culvert were analyzed based on the control variable method. The results show that the deformation and stress of the arch culvert are positively correlated with the fill height h and pipe diameter R. When h < 25 m, the deformation and stress increase linearly with the increase in the fill height, and when h > 25 m, the deformation and stress increase in a curve form. When R …
Research On Reasonable Completion State And Construction Stage Of Fenghuang Road Bridge,
2023
Chengdu Engineering Corporation Limited, Chengdu, Sichuan 610000, China
Research On Reasonable Completion State And Construction Stage Of Fenghuang Road Bridge, Chen Qiang, Gao Libao, Du Hongliang
Journal of China & Foreign Highway
In order to study the reasonable completion state of Fenghuang Road Bridge and analyze the construction stage, the finite element model was first established by Midas/Civil, and the correlation matrix was extracted. The minimum strain energy of Fenghuang Road Bridge was used as the objective function, and the mathematical optimization model was established by Matlab to determine the reasonable completion state and construction sequence of the bridge. To ensure reasonable cable force of the bridge, the construction cable force was solved by the forward assembly iteration, and the law of the construction cable force was basically the same as that …
Research On Damage Location Based On Time Reversal And Ultrasound‐Probability Imaging Algorithm,
2023
School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Research On Damage Location Based On Time Reversal And Ultrasound‐Probability Imaging Algorithm, Yin Xinfeng, Yang Jinyi, Zhang Ming
Journal of China & Foreign Highway
In order to study the location of structural damage, an improved time-reversal (TR)-based ultrasound-probabilistic imaging (TRPDI) algorithm was proposed in this paper. The electrical signal was applied to the piezoelectric ceramics (PZT) attached to the surface of the aluminium plate to generate an ultrasonic Lamb wave with good propagation performance in the aluminium plate. Based on Lamb wave theory and TR theory, the damage index was optimized, and the damage imaging algorithm was used to analyze the damage degree of the specimen and locate the damage. Three different data processing methods were used to obtain the active components in the …
Experiment Research Of High Pressure Jet Grouting Pile On Ultra‐Shallow Buried Tunnel In Strong Weathered Stratum,
2023
Guangdong Yunmao Expressway Co., Ltd., Guangzhou, Guangdong 510623, China
Experiment Research Of High Pressure Jet Grouting Pile On Ultra‐Shallow Buried Tunnel In Strong Weathered Stratum, Lu Liyang, Liu Huan, Li Pinpin
Journal of China & Foreign Highway
By taking the ultra-shallow buried construction of Xinwu Tunnel in Luoding–Xinyi Expressway in Guangdong Province as the engineering background, the key construction parameters and formation reinforcement effect of high-pressure rotary churning pile in ultra-shallow buried tunnel surrounding rock of fully weathered strata were compared. The results show that: ① slurry pressure, rotary churning speed, and lifting speed have obvious effects on the static load bearing capacity of a single pile. Under the same static load condition, greater slurry pressure indicates a lower cumulative settlement value of a single pile and a smaller increase in cumulative settlement value, and the change …
Study On Parameter Optimization Of Feet‐Lock Anchor Pipes Of Tunnels In Unconsolidated Formation,
2023
Nanjing Branch, CCCC Third Harbor Engineering Co., Ltd., Nanjing, Jiangsu 210011, China
Study On Parameter Optimization Of Feet‐Lock Anchor Pipes Of Tunnels In Unconsolidated Formation, Tang Heqing, Jiang Xishan, Yang Peng
Journal of China & Foreign Highway
In order to give full play to the supporting role of the feet-lock anchor pipe in the tunnel with unconsolidated formation, it is necessary to obtain the optimal construction parameters of the feet-lock anchor pipe. Based on a tunnel project on the Huaping–Lijiang Expressway in Yunnan Province, this paper conducted numerical simulation and field test analysis. By comparing the arch subsidence and horizontal convergence of the supporting structure when the feet-lock anchor pipe with different parameters was constructed, the paper explored the characteristics and causes of the influence of construction parameters on the feet-lock effect. The results show that the …
Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel,
2023
Changsha University of Science and Technology
Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel
Journal of China & Foreign Highway
In order to obtain the flame retardant effect of the warm-mixed flame retardant asphalt pavement in highway tunnels, based on the finite element method and thermodynamics theory, the thermal analysis module of Ansys finite element software was used to study the flame retardant effect of ordinary asphalt pavement, flame retardant asphalt pavement, and warm-mixed flame retardant asphalt pavement under different fire scales. The maximum temperature of the three types of pavement increased with the increase in the fire scale. Under any fire scale, the flame retardant effect of the warm-mixed flame retardant asphalt pavement was increased by 4.9%–8.5% compared with …
Study On Arrangement Law Of Grouting Bolt In Mountain Tunnel,
2023
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, China; 2. No. 3 Engineering Co., Ltd., China Railway 19th Bureau Group Corporation Limited, Shenyang, Liaoning 110136, China
Study On Arrangement Law Of Grouting Bolt In Mountain Tunnel, Zhao Licai
Journal of China & Foreign Highway
In the sandy soil area with abundant water content, grouted bolts can solve the problems of poor stability of surrounding rock and groundwater erosion in tunnel construction. However, the unreasonable arrangement of grouted bolts will cause the waste of slurry and fail to achieve the predetermined grouting effect. Based on the differential equation of slurry diffusion, this paper realized the numerical simulation of grouted bolts in a tunnel through software secondary development. Combined with mathematical statistics, the influence of the distance of grouted bolts, tunnel radius, and grouting time on the formation of grouting rings in mountain tunnels was studied. …
Experimental Study On The Diagonal Shear Of Asphalt Mixture At Micro‐Surfaces,
2023
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. National & Local Joint Engineering Research Center of Transportation and Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China
Experimental Study On The Diagonal Shear Of Asphalt Mixture At Micro‐Surfaces, Huang Weirong, Yang Yuzhu, Wang Cheng, Huang Feng, Yang Bo
Journal of China & Foreign Highway
A new 45° diagonal shear test was conducted to study the shear properties of the SBR-modified emulsified asphalt mixture at the micro-surface under the influence of different loading rates, different interface states, and different temperatures and water. The shear failure forms at the micro-surface at different temperatures were explained, and the effects of viscous layer oil, soil, and water on the shear strength at the micro-surface were analyzed. The results show that a faster loading rate at the micro-surface indicates higher shear strength. The shear failure mode of micro-surface at normal temperature is mainly an interlayer shear failure, while that …
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method,
2023
Nanning Vocational and Technical University, Nanning, Guangxi 530003, China
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method, Yang Zhihui, Li Shanhua
Journal of China & Foreign Highway
Uniaxial compression tests were carried out on stable soft soil samples with different cement contents. Based on the test results, a mesoscopic numerical simulation of PFC2D discrete element particle flow during soil sample deformation was conducted to analyze the mechanical behavior and displacement field distribution of cement soil after failure. The results show that with the increase in cement content, the uniaxial shear strength and elastic modulus of the solidified soft soil sample show an exponential function and rise, and the failure strain shows a quadratic function with the increase in cement content. The mechanical parameters and stress-strain curves of …
Study On Effect Of Fiber Stabilizers On Water Temperature Cycle Damage Resistance Of Drainage Asphalt Mixtures,
2023
Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China; 2. Tianquan County Transportation Bureau, Ya’an, Sichuan 625500, China
Study On Effect Of Fiber Stabilizers On Water Temperature Cycle Damage Resistance Of Drainage Asphalt Mixtures, Liu Fuming, Wu Di, He Qingde, Yang Zhiping
Journal of China & Foreign Highway
In order to study the effect of fiber stabilizer on the water temperature cycle damage resistance of drainage asphalt mixture, drainage asphalt mixture without fiber stabilizer and with wood fiber, polyester fiber, and basalt fiber, respectively, were compared through tests. By standard dispersion test and immersed dispersion test, the anti-spalling ability of the mixture was analyzed. Under the same asphalt condition, the standard dispersion loss of the drainage asphalt mixture was reduced to different degrees after adding fiber stabilizer, which could increase the anti-spalling property of the drainage asphalt mixture to some extent. The splitting, indirect tensile, and rutting tests …
Experimental Analysis On Recycling And Mechanical Properties Of Waste Cement,
2023
Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Experimental Analysis On Recycling And Mechanical Properties Of Waste Cement, Chen Liang
Journal of China & Foreign Highway
In order to recycle waste cement, construction waste cement materials were collected in the laboratory, and they were crushed, ground, and heat treated to facilitate reuse. Then, the waste cement was combined with the commonly used active fly ash admixture to prepare a new cement material for test analysis. The results show that the new cement material produced by industrial by-product, fly ash and waste cement material is feasible. A small amount of construction waste cement material (about 5%) can increase the 28-day compressive strength of cement by more than 50%, and the compressive strength of the prepared building material …
Experimental Study On Characteristics And Stability Of Different Aged Steel Slag Aggregate,
2023
Guangxi Transportation Science and Technology Group Co., Ltd., Nanning, Guangxi 530007, China; 2. Changsha University of Science & Technology, Changsha, Hunan 410114, China
Experimental Study On Characteristics And Stability Of Different Aged Steel Slag Aggregate, Zhang Hongri, Wang Guiyao, Feng Jian, Lan Tianzhu, Wu Tao
Journal of China & Foreign Highway
Steel slag aggregate has good building material properties, but the utilization rate of steel slag in road engineering is low at present. In this paper, the chemical composition, basic physical and mechanical indexes, f⁃CaO, f⁃MgO, pulverization rate, CRB expansion rate, and other indexes of open-air aged steel slag aggregate in Fangchenggang, Guangxi Province for 0, 6, and 12 months were studied. The results show that the physical and mechanical properties of steel slag aggregate basically meet the requirements of road base materials and subgrade fillers, but the indexes of f⁃CaO, pulverization rate, and CRB expansion rate of steel slag aggregate …
Influence Factors Of Deicing And Thaw Performance Of Asphalt Mixture With Low Freezing Point,
2023
Sichuan Highway Planning, Survey, Design, and Research Institute Ltd, Chengdu, Sichuan 611141, China; 2. Research and Development Center of Transport Industry of Technologies, Materials and Equipments of Highway Construction and Maintenance, Chengdu, Sichuan 611130, China; 3. Sichuan Provincial Laboratory of Pavement Structural Materials and Maintenance Engineering, Chengdu, Sichuan 611130, China
Influence Factors Of Deicing And Thaw Performance Of Asphalt Mixture With Low Freezing Point, Zhou Shuiwen, Lin Fang, Zhang Xiaohua, Zhang Lingbo, Jiang Haoqiu
Journal of China & Foreign Highway
The conductivity test was used to study the release law of thawing and deicing components. The freezing test was used to study the cooling law of the mixture, and the thawing rate test was used to study the thawing and deicing performance. The results show that the release of thawing and deicing components of materials with a low freezing point is temperature-dependent, and the release at the high temperature is 3.49–3.77 times that at the low temperature. The granular materials tend to dissolve in water, which results in the release rate of thawing and deicing components faster than that of …
Study On Thermal Property Of Fast Growing Grass Fiber And Its Asphalt Mortar,
2023
Southern Green Road Research Institute, Central South University of Forestry & Technology, Changsha, Hunan 410004, China
Study On Thermal Property Of Fast Growing Grass Fiber And Its Asphalt Mortar, Xia Chaoming, Jiang Kang, Wu Chaofan, Liu Kefei
Journal of China & Foreign Highway
In order to investigate the thermal properties of fast-growing grass fiber and its asphalt mortar, the physical properties and thermal properties of bamboo fiber, reed fiber, and its asphalt mortar were tested and compared with those of lignin fiber and its asphalt mortar by physical property test, thermal weight loss test, and differential scanning calorimetry test. The results show that the addition of plant fiber can effectively improve the high temperature performance of asphalt, but it has a slight inhibition effect on the low temperature performance of asphalt. The quality loss of plant fiber in different temperature ranges is the …
