Dynamic Responses Of Super‑Wide Self‑Anchored Suspension Bridge Under Blast Loading,
2024
School of Safety Science and Engineering , Nanjing University of Science and Technology , Nanjing , Jiangsu 210094 , China
Dynamic Responses Of Super‑Wide Self‑Anchored Suspension Bridge Under Blast Loading, Zhou Guangpan, Lin Zhicheng, Fan Jin, Wang Mingyang
Journal of China & Foreign Highway
To study the dynamic response and damage characteristics of the super-wide concrete self-anchored suspension bridge under the blast loading,a real bridge with these characteristics was selected as the background,and the numerical simulation was used to analyze the dynamic response of the top surface crack shape and the vertical displacement of the bottom plate of the super-wide box girder under the close blast of the bridge deck.Firstly,the refined finite element model of the whole bridge was established by using SolidWorks and HyperMesh.Secondly,the blast loading was applied by Ansys/LS-DYNA and *LOAD_BLAST_ENHANCED (LBE ) method,and the reliability of the calculation method was verified …
Calculation Analysis Of The S Urrounding Rock Pressure In Shallow Buried Unsymmetrial Tunnel Under Variable Slope,
2024
Faculty of Civil Engineering and Mechanics , Kunming University of Science and Technology , Kunming , Yunnan 650500 , China
Calculation Analysis Of The S Urrounding Rock Pressure In Shallow Buried Unsymmetrial Tunnel Under Variable Slope, Bai Yan, Qiao Ting Ting, Ning Xiaojun, Liu Guokun
Journal of China & Foreign Highway
To provide a reasonable meth od for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions for tunnel design,to establish a model for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions,and to employ the principle of ultimate equilibrium to derived the formula for calculating the surrounding rock pressure.The intermediate variable β' is introduced as the base for selecting the unsymmetrial pressure tunnels surrounding rock pressure calculation method under variable slope conditions,and the derived formulas in this paper are verified by comparing the calculated values of the normative …
Experimental Study On Influence Of Adsorbed Bound Water On Strength And Permeability Characteristics Of High Liquid Limit Soil,
2024
Hainan Transportation Engineering Construction Bureau , Haikou , Hainan 570100 , China
Experimental Study On Influence Of Adsorbed Bound Water On Strength And Permeability Characteristics Of High Liquid Limit Soil, Fu Ceyuan, Zhou Shijie
Journal of China & Foreign Highway
In order to reveal the influence of adsorbed bound water on the strength and permeability characteristics of high liquid limit soil,the initial adsorbed bound water content of the high liquid limit soil specimens from Hunan and Hainan was controlled by different concentrations of sodium chloride solution,and thermogravimetric analysis method was used to determine the content.The direct shear test,unconfined compressive strength test,and permeability test were carried out.The results show that the adsorbed bound water content decreases with the increase in salt solution concentration,while the strong bound water content is basically unchanged.The adsorbed bound water has a high viscosity,low activity,and certain solid-like …
Effect Of Cellulose Fiber On Humidity Control And Properties Of Cement Mortar,
2024
CCCC Highway Con sultants Co .， Ltd.， Beijing 100088 ， China
Effect Of Cellulose Fiber On Humidity Control And Properties Of Cement Mortar, Liang Jinguo, Ma Baofu
Journal of China & Foreign Highway
To explore the effect of flax cell ulose fiber on the humidity and basic properties of cement mortar,this paper adopted flax cellulose fibers with different lengths (0.5 and 5 mm ) and mixing amounts (mass fraction of 0.5%,1%,1.5%,and 2% of cement ).Tests were conducted on rheological properties,mechanical properties,autogenous shrinkage properties,and internal relative humidity development of cement mortar.Setting time,compressive strength,shrinkage rate,and relative humidity were used to evaluate the performance improvement effect of cellulose fiber on cement mortar.The results show that the absorbance rate of flax fiber per unit mass of 0.5 mm is 3.45 times its weight,while the absorbance rate of …
Micro Mechanical Analysis And Experiment On Fatigue Damage Of Rubber Powder Asphalt Mixture Of Expressway,
2024
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures , Shijiazhuang Railway University , Shijiazhuang , Hebei 050043 , China
Micro Mechanical Analysis And Experiment On Fatigue Damage Of Rubber Powder Asphalt Mixture Of Expressway, Li Nanpeng, Wang Guoqing, Wang Zhibin, Zhang Xia3, Si Chundi
Journal of China & Foreign Highway
To explore the fatigue damage mechanism and micro-mechanical behavior of the pavement of rubber powder asphalt mixture (ARHM- 20) of expressway influenced by heavy vehicles,a three-dimensional microstructural model of the mixture was built based on the discrete element method,and research on the damage mechanism from aggregate motion to macroscopic permanent deformation were conducted.The Burger's constitutive model was used to characterize the viscoelastic properties of asphalt mortar.The macro mechanical parameters of Burger ’s model at different temperatures were obtained through asphalt creep tests,and the micro modeling parameters were obtained based on the macro and micro conversion formulas.The irregular coarse aggregate was …
Performance Of Chlorine Salt Snow‑Melting Agent Based On Improved,
2024
School of Automotive and Traffic Engineering , Wuhan University of Science and Technology , Wuhan , Hubei 430065 , China ;Qinghai Highway Bureau , Xining , Qinghai 810001 , China
Performance Of Chlorine Salt Snow‑Melting Agent Based On Improved, Shrp Ice‑Melting Testlyu Yuejing, Dang Bo, Zhang Zhiwei, Tang Wen, Fan Yu
Journal of China & Foreign Highway
Chlorine salt snow-melting agent has been widely used because of its excellent ice-melting and snow-removing performance,low price,and easy access.In order to explore the problems of different temperature applicability,non-uniform standard,and rough spreading methods of chlorine salt snow-melting agents,this paper analyzed the influence of temperature,solid and liquid state,and spreading methods on the ice-melting performance of three commonly used chlorine salt snow-melting agents,namely NaCl,CaCl2,and MgCl2,through an improved SHRP ice-melting test.The test results show that the ice-melting performance of the chlorine salt snow-melting agent has strong temperature sensitivity.MgCl2 and CaCl2 snow-melting agents have an exothermic effect during the melting process.The ice-melting efficiency of the …
Pollution Characteristics Of Heavy Metals In Solid Waste Subgrade Filling Materials,
2024
School of Traffic & Transportation Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
Pollution Characteristics Of Heavy Metals In Solid Waste Subgrade Filling Materials, Du Qianhui, Fu Wei, Zhang Junhui, Tang Qiang, Gu Fan
Journal of China & Foreign Highway
Using solid waste in the road engineering field for subgrade filling is an important approach for building green and low-carbon emission roads.However,most solid waste contains heavy metal pollutants to varying degrees,and heavy metals will be released under complex environments including rainfall infiltration and groundwater immersion,thereby causing pollution to the surrounding soil and groundwater if not handled properly.This paper reviewed the current status of research on four aspects,including the comprehensive use of solid waste materials in subgrade engineering,the leaching and migration behaviors of heavy metals in solid waste,and the prevention and control treatment of heavy metals in solid waste.It is found …
Analysis Of Asphalt Pavement Structure Based On Master Curve Parameters Of Dynamic Modulus Of Asphalt Mixture,
2024
Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education , Changsha University of Science & Technology , Changsha , Hunan 400114 , China ;School of Traffic and Transportation Engineering , Changsha University of Science & Technology , Changsha , Hunan 400114 , China
Analysis Of Asphalt Pavement Structure Based On Master Curve Parameters Of Dynamic Modulus Of Asphalt Mixture, Liu Zhaohui, Yang Xin, Huang You, Liu Li
Journal of China & Foreign Highway
In order to study the effect of the change in the master curve parameters of the dynamic modulus of asphalt mixture and the interaction on the structural response of asphalt pavement,a three-dimensional model of the asphalt pavement structure was established using the finite element method,and the structural calculations of asphalt pavement with semi-rigid base and flexible base were carried out.The master curve parameters of the dynamic modulus δ,α,β,and γ were taken as the influencing factors,and the maximum tensile strain at the bottom of the asphalt layer and the vertical compressive strain at the top of the subgrade were set as …
Mechanism Of Water‑Damaged Landslides Of Embankments And Comparison Of Reinforcement Measures,
2024
Anhui Transport Consulting & Design Institute Co ., Ltd., Hefei , Anhui 230088 ,China ;Highway Traffic Energy Saving and Environmental Protection Technology Transportation Industry R&D Center ,Hefei , Anhui 230088 ,China
Mechanism Of Water‑Damaged Landslides Of Embankments And Comparison Of Reinforcement Measures, Hu Minghua, Zhang Baiyong, Xu Kui
Journal of China & Foreign Highway
Water damage to embankments serious ly affects the normal operation of highways,so it is extremely important to ensure the stability of the embankment.In addition,it is necessary to analyze the mechanism and study the safety control measures for water-damaged landslides of the embankment.A highway subgrade embankment was studied,and the causes and formation mechanism of the landslide were qualitatively analyzed based on the on-site deformation monitoring and stability calculation.Then,the stability coefficients of different reinforcement schemes were calculated.An appropriate reinforcement scheme was recommended by considering the project cost,construction technology,and construction period.The results indicate that uneven settlement of the embankment stratum is the fundamental …
Meso-Mechanical Properties Of Bearing Ratio Of Waste Lime‑Fly Ash Macadam And Soil Mixture Based On Discrete Element,
2024
Kunshan Transportation Development Holding Group Co ., Ltd., Suzhou , Jiangsu 215335 ,China
Meso-Mechanical Properties Of Bearing Ratio Of Waste Lime‑Fly Ash Macadam And Soil Mixture Based On Discrete Element, Zhang Xiaofei, Chen Yuru, Zhang Song, Gao Lei, Tian Angran, Tang Qiang
Journal of China & Foreign Highway
In the process of applying construction waste to subgrade,the bearing capacity of the material has an important impact on the service performance of roads.In order to evaluate the meso-mechanical properties of construction waste used as subgrade filler,the bearing ratio test of waste lime-fly ash macadam and soil mixture with different stone contents was carried out by using discrete element software.The strength formation mechanism was revealed by using the discrete element method.The results show that the bearing ratio of the mixture increases with the increase in the stone content and reaches the maximum value when the stone content is 80%.In the …
Review On Lcca And Lca Methods For Pavement Based On Bim,
2024
College of Transportation and Civil Engineering , Fujian Agriculture and Forestry University , Fuzhou , Fujian 350004 , China
Review On Lcca And Lca Methods For Pavement Based On Bim, You Shengjie, Hu Yonggang, Liu Xinsuo, Zheng Xiaoyan
Journal of China & Foreign Highway
Currently,life cycle cost analysis (LCCA ) and life cycle assessment (LCA ) methods are commonly used to assess the economic and environmental impacts of pavement during the whole life cycle.However,there are drawbacks in the application of LCCA and LCA methods,such as a large amount of data and multiple data categories,which lead to a tedious evaluation process.In view of this,some scholars have tried to combine building information modeling (BIM ) with LCCA and LCA methods to optimize the evaluation process.In the pavement field,the combination of LCCA and LCA with BIM is still in its infancy,lacking a summary of relevant research results.Therefore,this …
Anti‑Freezing Performance Of Cement-Stabilized Mixture For Recycled Aggregate From Solid Construction Waste,
2024
China Road & Bridge Corporation , Beijing 100011 , China ;East Africa R&D Center , China Communications Construction Company Ltd , Nairobi 999070 , Kenya
Anti‑Freezing Performance Of Cement-Stabilized Mixture For Recycled Aggregate From Solid Construction Waste, Zheng Jiajia, Zhang Laijun, Wang Xihui, Xie Jianwei, Chen Zhiyong
Journal of China & Foreign Highway
This paper investigated the effects of particle size and content of recycled aggregate on the anti-freezing performance of cement-stabilized recycled aggregate mixture,so as to provide a reference for the fine utilization of recycled aggregate with different particle sizes.The basic performance indexes of recycled aggregates with different particle sizes were tested,and the optimum moisture content and maximum dry density were determined by compaction test.The specimens were prepared with 4% cement content,and the anti-freezing performance of the mixture was evaluated by testing the unconfined compressive strength loss of the mixture after the freeze-thaw cycle.The results show that the optimum moisture content increases,and …
Experimental Study On Road Performance Of Resin Elastomer For Seamless Expansion Joints Of Bridges,
2024
Jiangsu Communications Engineering Construction Bureau , Nanjing ,Jiangsu 211899 , China
Experimental Study On Road Performance Of Resin Elastomer For Seamless Expansion Joints Of Bridges, Zhou Wei, Sheng Liang, Gao Qin, Zhang Hui, Zhao Menglong
Journal of China & Foreign Highway
Seamless expansion joint is a new type of bridge expansion joint.In order to study the road performance of resin elastomer for seamless expansion joints,the feasibility of applying resin elastomer to small and medium displacement expansion joints of bridges was explored.Through the rutting test at 60 ℃, low-temperature beam bending test at −10 ℃,dynamic modulus test,Poisson's ratio test,and overlay test (OT),the high and low temperature stability,deformation performance,and fatigue crack resistance of the resin elastomer were compared.The test results show that the dynamic stability of the resin elastomer at 60 ℃ is more than 31 000 times/mm,and the bending strain at low …
Experimental Study On Adhesive Pe Rformance Of Second-Order Thermosetting Epoxy Asphalt In Bridge Deck Pavement,
2024
Yichang Transportation Authority , Yichang , Hubei 443000 , China
Experimental Study On Adhesive Pe Rformance Of Second-Order Thermosetting Epoxy Asphalt In Bridge Deck Pavement, Zhou Changdong, Dai Mingjing, Zhao Mingyu, Li Zhiqiang, Lei Yuxiang, Ding Qingjun
Journal of China & Foreign Highway
Based on the Wujiagang Yangtze River bridge project in Yichang,the interfacial shear strength and pull-out strength of the second-order thermosetting epoxy asphalt material between RA asphalt concrete and high viscoelastic SMA asphalt concrete in pavement structure were studied under different spraying amount,different first-stage curing time,different curing time,and different service temperatures.In addition,the influence of spraying amount on shear fatigue resistance was studied.The results show that with the increase in the spraying amount of the second-order thermosetting epoxy asphalt,the adhesive performance and shear strength are improved,and the shear fatigue resistance of the structure is enhanced.At a construction ambient temperature of 25‒35 ℃,the …
Design And Key Technologies Of Bridges With Long‑Cantilever Closed Steel Box Composite Girder,
2024
Shanxi Transportation Science Highway Survey and Design Institute Co ., Ltd., Taiyuan ,Shanxi 030032 , China ;Shanxi Transportation Survey & Design Institute Co .,Ltd., Taiyuan ,Shanxi 030032 , China
Design And Key Technologies Of Bridges With Long‑Cantilever Closed Steel Box Composite Girder, Ji Jiandong, Wang Bin
Journal of China & Foreign Highway
In order to meet the span requirements of bridges over the Yellow River and reduce the interference of temporary construction facilities on flood discharge from the Yellow River,the Linyi Yellow River Bridge was studied.The main bridge adopted a continuous long-cantilever closed steel box composite girder of (112 + 28 × 128 + 120) m and was divided into two parts,with the maximum length of the parts being 1 912 m.The steel box composite girder was constructed by incremental launching method without temporary piers,and the bridge deck was installed after the closed steel box girder was in place.The installation sequence of …
Supporting Capacity Anal Ysis And Construction Scheme Optimization Of Support System For Cast‑In‑Situ Box Girders In High‑Pier Wading Bridges,
2024
Faculty of Civil Engineering and Mechanics , Kunming University of Science and Technology , Kunming ,Yunnan 650500 , China
Supporting Capacity Anal Ysis And Construction Scheme Optimization Of Support System For Cast‑In‑Situ Box Girders In High‑Pier Wading Bridges, Guo Tao, Yao Yuchen, Ma Hongze, Huang Xiaomin, Zhang Yongchun
Journal of China & Foreign Highway
Although a concrete bridge su pport system is a temporary structure,it still has a supporting capacity.With the development of bridge engineering,concrete bridges with high piers and long spans are gradually applied in deep reservoir areas,and the forces on scaffolding are more and more complex.Traditional manual calculations in structural mechanics can no longer completely reflect the stress-strain states of scaffolding with irregular configurations,special parts,and uncommon conditions.Thus,it is necessary to use a numerical method to calculate the supporting capacity of scaffolding and design construction schemes.This paper took a concrete wading bridge with high piers as an example.An evaluation method based on the …
A Rapid Test Method For Deflection Of Small And Medium‑Span Bridges,
2024
China Railway Development and Investment Group Co ., Ltd., Kunming , Yunnan 650200 , China
A Rapid Test Method For Deflection Of Small And Medium‑Span Bridges, Zhang Aipin, Ma Lindong, Chang Zhugang, Fan Zhihao
Journal of China & Foreign Highway
Bridge deflection response is on e of the most important indicators used for structural condition assessment of bridges.There are currently many methods and devices for deflection measurement,but they are not satisfying in terms of economy,applicability,and measurement accuracy at the same time.This paper proposed a rapid and highly accurate method for measuring mid-span deflection of small and medium-span bridges.By using the high accuracy of displacement transducers in direct contact measurement,an auxiliary measurement device was developed to transfer the deflection of the measurement points on the bridge to the displacement transducer in the form of a rigid connection,thus achieving accurate and dynamic …
Numerical Simulation Of Mechanical Performance For Anti‑Collision Steel Pontoon,
2024
China Construction Fifth Engineering Division Co ., Ltd., Changsha , Hunan 410002 , China
Numerical Simulation Of Mechanical Performance For Anti‑Collision Steel Pontoon, Han Xiaolei, Wang Bo, Li Weidong
Journal of China & Foreign Highway
Anti-collision steel pontoo n has good plasticity and energy absorption properties in ship-bridge collision.To explore the factors affecting the anti-collision performance of the anti-collision pontoon,a collision model composed of ship,anti-collision pontoon,and pier system was built based on finite element software Ansys/LS-DYNA.The collision mechanism and process were numerically simulated,and the effects of connection type between anti-collision pontoon and pier,peak angle of pontoon,and anti-collision pontoon stiffness on the collision force of the pier were investigated.The three-stage division method of collision force curve was put forward.The analysis shows that the fixed inwall of the anti-collision steel pontoon and connection to the pier surface …
Deformation And Damage Characteristics Of A Newly Operated Tunnel Caused By Above Foundation Pit Construction,
2024
China Railway Southern Investment Group Co ., Ltd., Shenzhen , Guangdong 518060 , China
Deformation And Damage Characteristics Of A Newly Operated Tunnel Caused By Above Foundation Pit Construction, Liu Jiqiang, Zhu Min, Hao Kun, Chen Dengwei, Chen Xiangsheng
Journal of China & Foreign Highway
The construction of foundation pits in granite residual soil layers is prone to causing upheaval deformation and structural damage in shield tunnels below.Based on the engineering case of a newly operated metro tunnel collinear with the above long-distance deep foundation pit in Shenzhen,a three-dimensional finite element model was established to investigate the variation law of the heave and horizontal convergence of the shield tunnel caused by the deep foundation pit excavation.The correlation between the longitudinal stress of the lining structure and the damage was analyzed.The results indicate that the tunnel deformation caused by foundation pit unloading is primarily vertical heave,accompanied …
Dynamic Response Rules Of Adjacent Buildings To Blasting Construction In Shallow Buried Tunnels,
2024
Sichuan Chuanjiao Road and Bridge Co ., Ltd., Guanghan , Sichuan 618300 , China
Dynamic Response Rules Of Adjacent Buildings To Blasting Construction In Shallow Buried Tunnels, Luo Yanping, Li Jigang, Wang Sheng, Zeng Bin, Lai Jinxing, Feng Zhihua, Qiu Junling
Journal of China & Foreign Highway
In order to study the dynamic response rule of overlying buildings during blasting construction in shallow buried tunnels,the urban tunnel in Fuzhou was taken as the engineering background,and the on-site monitoring and Ansys/LS-DYNA simulation were used to analyze the structural response of overlying buildings.The monitoring results show that the building is most obviously affected by blasting in the vertical direction and has an obvious elevation amplification effect,and the maximum vibration velocity is 2.45 cm/s.The vibration velocity in all directions gradually decreases and tends to be stable with the increase in explosion center distance and decays rapidly when the explosion center …
