Correlation Analysis Between External Damages And Transverse Load Distribution Capacit Y Of Hollow Slab Bridges,
2023
1. Anhui Communications Holding Group Co., Ltd., Hefei, Anhui 230088, China;
Correlation Analysis Between External Damages And Transverse Load Distribution Capacit Y Of Hollow Slab Bridges, Cao Hao, Sun Dunhua, Wang Zichen, Zhao Fuli, Sun Haipeng, Xiong Wen
Journal of China & Foreign Highway
To correctly evaluate the service status of prefabricated hollow slab girder bridge, based on the measured data of apparent disease and load test of hollow slab girder bridge in reconstruction and expansion project, this paper first analyzed the data characteristics of the beam body, hinge joints, and support disease samples and obtained their statistical distribution rules. Then, according to the typical diseases (transverse cracks and hinge cracks at the bottom of the beam), the BP neural network was used to build a correlation model for them, and the close correlation between the two typical diseases of hollow slab girder bridge …
Research Of Disease Analysis And Reinforcement Technology For Typical Orthotropic Bridge Deck,
2023
1. State Key Laboratory of Health and Safety of Bridge Structures, Wuhan, Hubei 430034, China; 2. China Railway Bridge Research Institute Co., Ltd., Wuhan, Hubei 430034, China
Research Of Disease Analysis And Reinforcement Technology For Typical Orthotropic Bridge Deck, Guo Fukuan, Zhou Shangmeng
Journal of China & Foreign Highway
In order to effectively solve the disease problem of orthotropic steel bridge decks, this paper relied on a steel box girder cable-stayed bridge deck reinforcement project to carry out steel bridge deck disease analysis and reinforcement technology research. The results show that the main disease of steel bridge decks is fatigue cracking. The fatigue cracks are numerous, short, and deep, and they continuously grow and cause more severe disease. The excessive fatigue stress amplitude is the main factor leading to the fatigue cracking of steel bridge decks. Once the crack occurs, the stress amplitude of the crack tip increases continuously, …
Analysis Of Installation Method And Error Control Of Steel Girder Of Steel ⁃Concrete Composite Girder Cable ⁃Stayed Bridge,
2023
1. Hunan Road and Bridge Construction Group Co., Ltd., Changsha, Hunan 410018, China;
Analysis Of Installation Method And Error Control Of Steel Girder Of Steel ⁃Concrete Composite Girder Cable ⁃Stayed Bridge, Xiong Xianyong, Fu Yajun, Huang Gen
Journal of China & Foreign Highway
Compared with cable-stayed bridges with pure steel girders, the installation of a steel main girder of the steel⁃concrete composite girder cable⁃stayed bridge is more complicated, and the installation error control is more difficult. In this paper, the composite girder with a double box section was taken as the research object, and a finite element model was established to compare the installation methods of steel main girders. The best installation method was selected according to the principle of safety loading, and the causes of the installation errors of steel main girders were analyzed. The corresponding error control methods were proposed.
Cable⁃Stayed Bridge Of Cable Auxiliary Beam Arch Pylon ⁃Key Technologies Design Of Meishan Minjiang Bridge,
2023
T.Y. Lin International Engineering Consulting (China) Co., Ltd., Chongqing 401121, China
Cable⁃Stayed Bridge Of Cable Auxiliary Beam Arch Pylon ⁃Key Technologies Design Of Meishan Minjiang Bridge, Ma Zhendong, Lai Yaping, Chen Jiayong
Journal of China & Foreign Highway
The newly built Minjiang Bridge in Meishan City, Sichuan Province applies the concept of cable-assisted girder bridge. P4 steel arch tower combined with three-stage balanced double-plane cable and P3 and P5 auxiliary towers combined with thin cable of single cable plane were used to assist the load on the beam body, making the 2.5 m-high concrete main beam meet the requirements of the main span of 2 × 120 m. Through the analysis of the bearing force, the angle between the double-limb arch tower was 43.6°, and two pairs of cables were set in the auxiliary tower to achieve the …
Aesthetic Design Of Hechuan Qujiang Landscape Bridge,
2023
T.Y. Lin International Engineering Consulting (China) Co., Ltd., Chongqing 401121, China
Aesthetic Design Of Hechuan Qujiang Landscape Bridge, Zheng Guangqin, Chen Jiayong, Li Yue, Lai Yaping, Qiao Yunqiang
Journal of China & Foreign Highway
Hechuan Qujiang Landscape Bridge is located at the junction of Qujiang River and Jialing River. It is a 1 × 400 m simple supported single-cable surface ground anchor suspension bridge. The main girder is a steel box girder arranged with curved branches. One side is the highway system to meet the needs of motor vehicles across the river, and the other side is the greenway system to meet the needs of pedestrians and non-motor vehicles. In the design process, the aesthetic design of the bridge was fully studied from four aspects: environment aesthetics, structure aesthetics, function aesthetics, and form aesthetics. …
Study On Optimal Layout Of Cross ⁃Diaphragm In Oblique Small Box Girder,
2023
China Railway 24th Bureau Group Corporation Limited, Shanghai 200071, China
Study On Optimal Layout Of Cross ⁃Diaphragm In Oblique Small Box Girder, Mai Xinhao
Journal of China & Foreign Highway
In order to determine the optimal layout of the cross⁃diaphragms in the oblique small box girder, a prestressed concrete small box girder bridge with a 50 m span was taken as the research object, and its internal force under the load of the moving beam was numerically simulated and measured. First, the model was modified according to the measured stress data, and the maximum distance between the cross⁃diaphragms was determined by using the warping-limited normal stress. Then, the height and thickness of the middle cross⁃diaphragms were determined according to the deflection difference coefficient of the bridge span. Finally, according to …
Non⁃Gaussian Features Of Fluctuating Wind Pressures Under Combined Axle Condition,
2023
Shandong Railway Investment Holding Group Co., Ltd., Jinan, Shandong 250014, China
Non⁃Gaussian Features Of Fluctuating Wind Pressures Under Combined Axle Condition, Chen Zhiqiang
Journal of China & Foreign Highway
In view of the non-Gaussian characteristics of wind pressure on the train surface of a typical high-speed railway train and bridge system, the Gaussian variable was expressed as a Hermite polynomial considering non-Gaussian variables by using Hermite series expansion method, and the probability density curve and peak factor of train surface were analyzed. The results show that the Davenport peak factor based on Gaussian distribution obviously underestimates the non-Gaussian peak factor, and its probability density curve deviates from the actual curve of the measuring point. The Hermite series peak factor method based on the modified method takes into account the …
Application Of 3d Reconstruction Model In Inspection Of Bridge Apparent Defects,
2023
1. Yunnan Kun-Chu Expressway Investment and Development Co., Ltd., Kunming, Yunnan 650100, China;
Application Of 3d Reconstruction Model In Inspection Of Bridge Apparent Defects, Xu Guangli, Li Shaoyong, Tang Jun, Liu Shuqi, Zhou Yin
Journal of China & Foreign Highway
In view of problems such as low efficiency, poor accuracy, and imprecise three-dimensional (3D) location of defects in apparent defect inspection of bridges, this paper proposed a method for apparent defect inspection of bridges based on a 3D reconstruction model. By taking the indoor rectangular beam as the object, a three-dimensional bridge model was established, and its accuracy was verified. Then, based on the point cloud data derived from the model, a program was written in Python to realize the identification, measurement, and parameter derivation of apparent defects of bridges. Dade Bridge in Kunming, Yunnan Province was set as the …
Design And Construction Of Steel Caisson For Inclined Pilecap Of Beitstadsund Bridge In Norway,
2023
Sichuan Road & Bridge (Group) Co., Ltd., Chengdu, Sichuan 610072, China
Design And Construction Of Steel Caisson For Inclined Pilecap Of Beitstadsund Bridge In Norway, Yang Dingjun
Journal of China & Foreign Highway
At present, the underwater bridge foundation construction technology in China and abroad has been relatively mature, but the different geographical environments, hydrogeological conditions, the form of basic structure, and the available construction equipment lead to different construction schemes and technologies. The Beitstadsund Bridge in Norway is located near the Arctic Circle in central Norway and across the strait. In the design and construction of the deep-water steel cofferdam of the inclined steel pile cap for the bridge, the overall installation of the steel cofferdam was realized by setting the cofferdam support on the inclined steel pipe group, the overall positioning …
Study On Correction Method Of Cable Length Error In Construction Control Of Cable ⁃Stayed Bridges,
2023
School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Study On Correction Method Of Cable Length Error In Construction Control Of Cable ⁃Stayed Bridges, Huang Gen, Chen Changsong
Journal of China & Foreign Highway
In order to effectively correct the stay cable length error during the construction of the cable-stayed bridge, this paper proposed a correction method with the exposure of the sockets as the error control index and analyzed the influence of the elastic modulus, temperature effect, and anchor point coordinates of the cable on the cable length error from the perspective of construction control. Then, error correction was achieved by adjusting the position of the manufacturing cable length and the nut at the anchor end. The results of application in Jiayu Yangtze River Highway Bridge show that this method can improve the …
Analysis Of Mechanical And Deformation Characteristics Of Karst Tunnel Structure And Research On Treatment Technology,
2023
1. Guangxi Beitou Traffic Maintenance Technology Group Co., Ltd., Nanning, Guangxi 530029, China;
Analysis Of Mechanical And Deformation Characteristics Of Karst Tunnel Structure And Research On Treatment Technology, Huang Haifeng, Chang Zhenchao, Luo Junhui, Zhou Xiang, Ceng Fuquan, Tian Fapai
Journal of China & Foreign Highway
Combined with the construction process of Nongmo Karst Tunnel on Du’an–Bama Expressway, this paper used Midas-GTS finite element calculation software to conduct numerical simulation research on the stability of surrounding rock and treatment structure of tunnel with karst caves on either side, analyzed the influence of tunnel excavation on the stress and deformation characteristics of surrounding rock and supporting structure, and probed into the treatment effect of biased wall and root pile on the treatment of karst tunnel. The results show that the surrounding rock at the bottom of the tunnel, the top of the composite foundation, and the top …
Influence Of Proximity Construction Of A New Pile Foundation On Adjacent Metro Tunnel,
2023
School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China
Influence Of Proximity Construction Of A New Pile Foundation On Adjacent Metro Tunnel, Jin Shengji, Mu Anxin, Bi Bo, Xu Chao, Yu He
Journal of China & Foreign Highway
The construction of a bridge pile foundation and cap not only causes disturbance to its foundation and surrounding soil but also has a certain influence on adjacent existing structures. In order to study the influence of new pile foundation proximity construction on tunnels adjacent to subway sections, this paper took the pile foundation construction process of auxiliary bridge extension on both sides of Shenyang Changqing Bridge as the research object and adopted Midas/GTS finite element numerical simulation and construction monitoring methods to study the influence of new pile foundation proximity construction on tunnels adjacent to subway sections. The results show …
Research On Crack And Permeability Characteristics Of Cement ⁃Modified Expansive Soil Under Dry ⁃Wet Cycles,
2023
1. School of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China;
Research On Crack And Permeability Characteristics Of Cement ⁃Modified Expansive Soil Under Dry ⁃Wet Cycles, Bao Guiyong, Xu Yangshaojun, Jiang Zhijie, Rong Hongliu, Wang Jinlong
Journal of China & Foreign Highway
In order to study the engineering permeability characteristics of cement-modified expansive soil under dry and wet cycles, the mix ratio of cement-modified expansive soil was designed, and the orthogonal design test method was adopted. Image analysis software PACS, unconfined compressive strength test, and laboratory permeability test were used to study the crack development, strength attenuation characteristics, and permeability changes of cement-modified expansive soil under dry and wet cycle conditions. The results show that soil permeability and strength are greatly affected by the number of dry and wet cycles. Under the condition of dry and wet cycles, the moisture content of …
Study On Influence Of Freeze ⁃Thaw Cycles On Shear Properties Of Fly Ash Modified Saline Soil,
2023
College of Civil Engineering, Northeast Forestry University, Harbin, Heilongjiang 150040, China
Study On Influence Of Freeze ⁃Thaw Cycles On Shear Properties Of Fly Ash Modified Saline Soil, Cheng Zhuo, Cui Gaohang, Gao Zening, Hou Zhao, Gang Haohang
Journal of China & Foreign Highway
In order to explore the shear strength of fly ash-modified saline soil subgrade under the freeze-thaw cycle, saline soil samples from Suihua–Daqing Expressway were selected for direct shear test under different fly ash contents. The results show that the cohesive force and internal friction angle of the saline soil decrease after several freeze-thaw cycles. With the increase in fly ash content, the internal friction angle, cohesive force, and shear strength of the improved saline soil increase first and then decrease. When the fly ash content is 15%, the cohesive force, internal friction angle, and other mechanical indexes of the saline …
Effect Of Temperature And Light On Characteristics Of Asphalt Emissions,
2023
1. Experimental Teaching Center of Transportation Engineering, Tongji University, Shanghai 200092, China;
Effect Of Temperature And Light On Characteristics Of Asphalt Emissions, Zhu Xuwei, Tian Bo
Journal of China & Foreign Highway
In order to study the effects of temperature and light on the characteristics of asphalt emissions, atmospheric pressure chemical ionization–time-of-flight mass spectrometer (APCI‑TOF MS) and electron impact ionization mass spectrometry (EI‑MS) were used to quantitatively characterize the composition information of PG 62-22 asphalt emissions at different temperatures (40–200 °C). The effects of different temperatures and light on total emission factor, SOA conversion factor, intermediate volatile organic compound (IVOC)/semi-volatile organic compound (SVOC) volume fraction, and aromatics volume fraction of asphalt emissions were studied. The results show that the components of asphalt emissions change with temperature, and the components are complex and …
Study On Triaxial Mechanical Properties Of Glass Fiber Reinforced Cement Soil In Short Age,
2023
School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China
Study On Triaxial Mechanical Properties Of Glass Fiber Reinforced Cement Soil In Short Age, Wang Wei, Dai Mengdan, Yu Wenjie
Journal of China & Foreign Highway
In order to evaluate the improvement effect of fiber on the brittle damage of cement soil, a triaxial unconsolidated undrained (UU) test was carried out on glass fiber cement soil (GCS) with a curing age of 7 d and a mass fraction of glass fiber (GF) of 0, 2‰, 4‰, 6‰, and 8‰, respectively. The results show that: ① GCS retains the original strain softening characteristics of cement soil; ② For the same mass fraction of GF, the peak stress, peak strain, and residual strength of GCS samples increase gradually with the increase in confining pressure, but the brittleness index …
Study On Experimental Application Of Xinjiang Steel Slag In Cement Stabilized Base,
2023
1. Xinjiang Communications Construction Group Co., Ltd., Urumqi, Xinjiang 830016, China; 2. Xinjiang Jiaojian Highway Planning Survey and Design Co., Ltd., Urumqi, Xinjiang 830016, China;
Study On Experimental Application Of Xinjiang Steel Slag In Cement Stabilized Base, Chen Wei, Yu Haiming, Li Qian, Huang Yong, Si Yi
Journal of China & Foreign Highway
Based on the experimental study of Xinjiang steel slag in cement-stabilized base, the physical and chemical characteristics of steel slag were analyzed, and the unconfined compressive strength, splitting strength, and dry shrinkage performance of cement-stabilized steel slag and gravel mixture with different cement dosages (4% and 5%) and steel slag contents (30%, 40%, and 60%) were analyzed. The test results show that steel slag can be used as a good engineering aggregate in a cement-stabilized base, and with the addition of steel slag, the unconfined compressive strength and splitting strength of steel slag and gravel mixture are increased to varying …
Research On Cyclic Accumulative Strain Characteristics Of Structured Soft Clay,
2023
1. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Department of Civil Engineering, Hangzhou City University, Hangzhou, Zhejiang 310015, China
Research On Cyclic Accumulative Strain Characteristics Of Structured Soft Clay, Ding Zhi, Yu Jiangang, Sun Miaomiao, Wang Jiawei, Ye Ke
Journal of China & Foreign Highway
Due to its structural properties, natural soft clay is prone to produce large cumulative deformation under cyclic loads such as traffic, which has a great impact on engineering. In order to solve the deformation problem caused by structural failure of soft clay under dynamic action, dynamic characteristics of undisturbed soft clay near a highway in Hangzhou were tested by the dynamic triaxial device under cyclic loading, and the dynamic characteristics of saturated undisturbed soft clay under different effective consolidation confining pressures, vibration frequencies, and dynamic stress ratios under K0 (static earth pressure coefficient) consolidation conditions were studied. The results show …
Effect Of Activator On Compressive Strength Of Steel Slag Powder Cement Soil,
2023
1. Shanxi Transportation Construction Engineering Quality Detection Center, Taiyuan, Shanxi 030000, China;
Effect Of Activator On Compressive Strength Of Steel Slag Powder Cement Soil, Chen Fei, Wang Yanchun, Du Sujun
Journal of China & Foreign Highway
In order to reasonably solve the environmental pollution caused by steel slag, steel slag powder was used to improve cement soil. The optimal mix ratio was determined by a laboratory unconfined compressive strength test to prepare steel slag powder cement soil. In view of of low activity and limited compressive strength enhancement effect of steel slag powder, three kinds of activators including sodium hydroxide, silica fume, and calcium chloride were selected to be added to steel slag powder cement soil, so as to study the strength variation rule. The results show that the strength of cement soil can be improved …
Experimental Study On Time ⁃Varying Characteristics Of Saturated Water Content Of Granite Residual Soil In Acid⁃Etched Environment,
2023
1. China Communications Fourth Highway Engineering Bureau Co., Ltd., Beijing 100022, China;
Experimental Study On Time ⁃Varying Characteristics Of Saturated Water Content Of Granite Residual Soil In Acid⁃Etched Environment, Zhang Maolin, Xie Qingzhong, Fu Helin, Zhang Meng, Li Qinglong, Dong Hui
Journal of China & Foreign Highway
In order to clarify the correlation between saturated water content variability and slope stability, characteristic tests on saturated water content of granite residual soil affected by acid were carried out. Direct shear tests were carried out to test the variation rule of saturated water content and its characteristic value under the influence of vertical loading and acidification time, and the internal causes of variation were deduced based on the structural characteristics obtained by microscope electron microscopy. The results show that: ① The vertical pressure σ = 300 kPa is the turning point of the linear and nonlinear relationship, and under …
