Assessment Of Bridge Pier Response To Fire, Vehicle Impact, And Air Blast,
2023
University of Nebraska-Lincoln
Assessment Of Bridge Pier Response To Fire, Vehicle Impact, And Air Blast, Chen Fang, Qusai Alomari, Daniel G. Linzell
Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research
Highway bridges exposed to intentional or unintentional fire followed by combined vehicle impact and air blast are at risk of significant damage and, possibly, collapse. Limited studies examining the complex effects of these extreme demands on bridge support elements and parametrizing their response and damage are found in the open literature. Research that is presented is part of an ongoing numerical investigation examining round, multi-column, reinforced concrete (RC), bridge pier behavior subject to multi-hazard scenarios involving fire, vehicle impact, and air blast. Detailed nonlinear finite element analysis models of single columns and multi-column piers supported by a pile foundation system …
A High-Strength Precipitation Hardened Cobalt-Free High-Entropy Alloy,
2023
Missouri University of Science and Technology
A High-Strength Precipitation Hardened Cobalt-Free High-Entropy Alloy, Matthew Luebbe, Jiaqi Duan, Fan Zhang, Jonathan Poplawsky, Hans Pommeranke, Maalavan Arivu, Andrew Hoffman, Mario Buchely, Haiming Wen
Materials Science and Engineering Faculty Research & Creative Works
Recent studies on precipitation-hardened high-entropy alloys (HEAs) demonstrate their high strength and thermal stability, making them promising materials for high-temperature structural applications such as nuclear reactors. However, many existing HEAs contain cobalt (Co), which is unsuitable for nuclear applications because of the long-term activation issue of Co. Co is also expensive and considered a critical material for other applications. Therefore, it is desired to exclude Co from the composition. a Co-free (Fe0.3Ni0.3Mn0.3Cr0.1)88Ti4Al8 HEA was developed and studied in this work. in contrast to previous Co-free HEAs, this alloy is close to Equi atomic in its composition and promises a more …
Beirut Arab University - Faculty Of Engineering - Newsletter Issue 0,
2023
Beirut Arab University
Beirut Arab University - Faculty Of Engineering - Newsletter Issue 0, Faculty Of Engineering, Beirut Arab University
Engineering Newsletters
No abstract provided.
Analysis On Influence Factors Of Swelling Deformation Of Gravel Pile In Soft Soil Area Based On Orthogonal Numerical Test,
2023
Zhengzhou University of Science and Technology, Zhengzhou, Henan 450064, China; 2. Zhengzhou Key Laboratory of Geocomposite Materials, Zhengzhou, Henan 450064, China
Analysis On Influence Factors Of Swelling Deformation Of Gravel Pile In Soft Soil Area Based On Orthogonal Numerical Test, Fan Liujun, Lu Xiaoming, Miao Peng
Journal of China & Foreign Highway
The gravel pile composite foundation is usually accompanied by swelling deformation when vertical settlement deformation occurs. The research on the swelling deformation characteristics and influencing factors of gravel pile composite foundations is of great importance for analyzing the settlement rule and deformation mechanism of gravel pile composite foundations. Based on an orthogonal numerical test, this paper used the finite element software Midas GTS to analyze the main influencing factors of the swelling deformation of the gravel pile and used range and variance analysis to analyze the sensitivity and significance of each influencing factor. Finally, through regression analysis, the optimized swelling …
Study On Ultimate Bearing Capacity Characteristics Of Overlying Shell Foundation,
2023
NO.3 Engineering Co., Ltd. of CCCC Third Harbor Engineering Co., Ltd., Nanjing, Jiangsu 210000, China
Study On Ultimate Bearing Capacity Characteristics Of Overlying Shell Foundation, Bian Guirong, Li Fuyou, Qian Xiaotong, Xie Ke
Journal of China & Foreign Highway
For the calculation of the ultimate bearing capacity of the overlying hard crust foundation, based on the theory of Meerhoff and Hanna’s impact and shear failure, the sealing effect and stress diffusion effect of the overlying hard crust foundation were considered, and the formula for calculating the ultimate bearing capacity of the overlying hard crust double-layer foundation was derived and verified by an actual engineering example. The maximum error between the measured value and the calculated value of Hansen’s weighted average method, diffusion angle method, and Meerhoff and Hanna’s method was 74.2%, 31.5%, and 15.2% respectively, while the error was …
Analysis On Pavement Early Damage Characteristics And Influence Factors Of Baiyin Section Of National Highway 109,
2023
School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Analysis On Pavement Early Damage Characteristics And Influence Factors Of Baiyin Section Of National Highway 109, Shi Fuzhou, Han Fei, Tang Dandan, Liu Wuwen, Zhang Jinyuan
Journal of China & Foreign Highway
In order to explore the cause of early damage of highway asphalt pavement in Baiyin area of Gansu Province, this paper analyzed the main factors that affected the performance of asphalt pavement and investigated the use of asphalt pavement in this area, climate environment, and traffic conditions. By taking Baiyin section of National Highway 109 as an example, the specific data were deeply analyzed. Based on the investigation of pavement use, the situation and decay rule of local asphalt pavement were summarized. According to the investigation of the climate environment, the influence of solar radiation, temperature difference, and other conditions …
Test And Finite Element Analysis On Flexural Properties Of Steel Plate‒Uhpc Composite Beam,
2023
College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China; 2. China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan, Hubei 430056, China
Test And Finite Element Analysis On Flexural Properties Of Steel Plate‒Uhpc Composite Beam, Huang Yun, Zhao Hua, Tu Lei
Journal of China & Foreign Highway
In order to study the flexural properties of steel plate-ultra-high performance concrete (UHPC) composite beams, the static test of the flexural properties of a steel sheet-UHPC composite beam was first carried out. Then, Abaqus finite element software was used to simulate the whole process of static loading of the specimen, and different ways were used to simulate the studs in the composite beam. The most appropriate model was thus selected. Finally, based on the calibrated finite element model, the parameters of the steel plate-UHPC composite beam were analyzed, the main parameters included: UHPC compressive strength, steel plate strength, and stud …
The Calculation Theory Of Humidity For Subgrade ：A Perspective Review,
2023
Changsha University of Science and Technology
The Calculation Theory Of Humidity For Subgrade ：A Perspective Review
Journal of China & Foreign Highway
Subgrade humidity has a significant impact on its stiffness, deformation, and other properties. The theoretical calculation method of humidity field has always been one of the key issues in road engineering as a research method to evaluate its evolution law and mechanism. This paper reviewed and summarized the control equation of subgrade humidity calculation, hydraulic characteristics of unsaturated subgrade soil, and influencing factors of humidity. It was found that there were few studies on the coupling effects of multiple fields and factors such as stress, seepage, vegetation, and atmosphere in the whole calculation method system. It is suggested to carry …
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan,
2023
Yunnan Institute of Transportation Planning and Design, Kunming, Yunnan 650041, China; 2. Yunnan Communications Investment & Construction Group Co., Ltd., Kunming, Yunnan 650103, China; 3. Yunnan Key Laboratory of Digital Transportation, Kunming, Yunnan 650000, China
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan, Chen He, Lu Zhiqiang, Li Guo, Chen Zhengyu
Journal of China & Foreign Highway
In order to investigate the characteristics and mechanism of deep response of slopes subjected to different rainfalls in plateau mountainous area of Northwest Yunnan, remote real-time monitoring devices were deployed to carry out slope prototype field tests, analyze the effects of natural rainfalls in different forms and intensities on deep displacement and groundwater level changes, and put forward suggestions for landslide monitoring and early warning. The results show that the characteristics of heavy rainfall, steep slope, and rock fragmentation during flood season can induce the frequent fluctuation of groundwater level in the deeper part of the slope, which results in …
Experimental Study On Shear Strength Of Ehp Piles,
2023
Anhui Survey & Design Institute of Water Resources & Hydropower Co., Ltd., Hefei, Anhui 230088, China
Experimental Study On Shear Strength Of Ehp Piles, Wang Nanjiang, Liu Jianlong, Qiu Chengchun, Zhang Yuting, Tao Xiaoyu
Journal of China & Foreign Highway
The new environmental homogeneous plastic (EHP) pile improves the construction technology of traditional soil-cement mixing piles. It mixes the soil-cement slurry evenly in advance and then pours it into holes, so as to form piles with controllable physical properties. In order to test the strength of EHP piles, direct shear tests were carried out on field core sampling, field stirring sampling, and laboratory sampling, and the effects of pile depth, cement content, age, and curing conditions on shear strength were discussed. The test results show that the shear stress-displacement curve of the in-situ core sample is strain-softening; the shear strength …
Review And Outlook For Long‐Life Asphalt Pavement,
2023
Shandong Institute of Transportation Science, Jinan, Shandong 250102, China; 2. Key Laboratory of Highway Maintenance Technology and Transportation Industry, Jinan, Shandong 250102, China
Review And Outlook For Long‐Life Asphalt Pavement, Xu Xizhong, Wei Jincheng, Yan Xiangpeng, Zhang Zhengchao
Journal of China & Foreign Highway
In order to make clear the research status of long-life asphalt pavement in China and abroad, this paper summarized the development characteristics, pavement structure, design index, pavement material, dynamic response analysis of pavement, fatigue performance estimation, and other hot issues of long-life asphalt pavement, compared the structural characteristics of long-life asphalt pavement in various countries, and summarized the results of pavement material design and optimization. The research progress of the dynamic response of asphalt pavement was summarized, and the development direction of long-life asphalt pavement was discussed. The comprehensive analysis shows that long-life asphalt pavement is the development trend of …
Application Of Digital Image Processing In Cracks Of Concrete Pavement,
2023
College of Materials Science and Art Design, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
Application Of Digital Image Processing In Cracks Of Concrete Pavement, Gao Fan, He Chunguang, Wang Pengzhang, Qin Yanping, Duo Huaqiong
Journal of China & Foreign Highway
The image obtained by using the traditional crack detection method of concrete pavement has some problems, such as low contrast and high noise, which makes it difficult to meet the requirements of modern road engineering management or non-destructive testing. In order to eliminate the interference in crack images, digital image processing technology was used to improve the image quality through computers. This paper took digital image processing as the core and introduced its development and application in pavement cracks. Based on the research progress and achievements of digital image processing on pavement cracks in recent years, the principles and characteristics …
Study On Modulus Characteristics Of Semi‐Flexible Pavement,
2023
Yancheng Highway Administration Office, Yancheng, Jiangsu 224005, China
Study On Modulus Characteristics Of Semi‐Flexible Pavement, Cai Yubin, Gong Minghui, Xiong Zijia, Deng Cheng, Peng Gang, Zhang Lihua, Hong Jinxiang
Journal of China & Foreign Highway
Semi-flexible pavement has the advantages of good bearing capacity and strong shear deformation resistance and is an effective means to solve the rutting disease of intersections, bus stops, and other sections. However, due to the difference in mechanical properties, semi-flexible pavement can not completely refer to the design method of cement concrete pavement or asphalt concrete pavement, and one of the important tasks of establishing a design system suitable for semi-flexible pavement is to analyze the material modulus characteristics of pavement. In this paper, the dynamic modulus, indirect tensile stiffness modulus, and rebound modulus of laboratory forming and coring specimens …
Analysis And Evaluation Of Application Effect Of Hot Mix Plan Regeneration Technology In Asphalt Pavement,
2023
School of Traffic Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, China
Analysis And Evaluation Of Application Effect Of Hot Mix Plan Regeneration Technology In Asphalt Pavement, Yang Yanhai, Cui Hong, Yang Ye, Qian Baitong
Journal of China & Foreign Highway
In order to evaluate the practical application effect of plant-mixing hot regeneration technology, this paper, based on the actual project of plant-mixing hot regeneration technology in Liaoning Province, analyzed the use status, technical performance, and construction technology of pavement materials made by plant-mixing hot regeneration technology via measuring the volume index, asphalt content, grading composition, and strength of pavement core samples. The results show that the strength characteristics, high temperature stability, and low temperature crack resistance of the pavement materials made by plant-mixing hot regeneration technology can meet the normal use requirements of asphalt pavement under moderate traffic volume. The …
Research On Bridge Technical Condition Evaluation System Based On Bim,
2023
Hong Kong-Zhuhai-Macao Bridge Authority, Zhuhai, Guangdong 519000, China; 2. School of Civil Engineering & Transportation, South China University of Technology, Guangzhou, Guangdong 510640, China
Research On Bridge Technical Condition Evaluation System Based On Bim, Xia Zili, Jing Qiang, Gao Wenbo, Huang Liguan, Wu Xiaodong
Journal of China & Foreign Highway
There are some practical difficulties in bridge technical condition assessment, such as low visualization degree, strong subjectivity of assessment, low efficiency of disease location, and poor continuity of assessment data. In view of the requirements of bridge technical condition assessment and the above-mentioned problems, this paper reviewed the standard system of bridge technical condition assessment in China and the application of BIM in bridge operation and maintenance, analyzed the modelling points and assessment business processes of bridge BIM model, and designed the overall framework and business module functions of the BIM-based technical condition assessment system. The bridge technical condition assessment …
Study On Reliability Of Special Shaped Arch Bridge With Spatial Three‐Cable‐Plane Inclined Suspenders Under Live Load,
2023
College of Transportation Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Study On Reliability Of Special Shaped Arch Bridge With Spatial Three‐Cable‐Plane Inclined Suspenders Under Live Load, Zhu Liming, Shen Kun, Wang Xingyun
Journal of China & Foreign Highway
Because the structure of a special shaped arch bridge is complicated, there are few studies on the fatigue reliability of its suspender. In order to study the fatigue reliability of the suspender of complex shaped arch bridges under live load, the actual project of a 157 m through-type steel arch bridge with three-cable-plane inclined suspenders with special shaped tie bars was studied. The fatigue reliability formula based on Weibull distribution was applied to analyze the fatigue reliability of the suspender under different live load conditions. The results show that the design live load ensures a higher safety reserve and meets …
Study On Pavement Structure Performance Based On Polymer Alloy Material For Steel Deck Pavement,
2023
Chongqing Jiaotong University, Chongqing 400074, China
Study On Pavement Structure Performance Based On Polymer Alloy Material For Steel Deck Pavement, Yang Bo, He Zhaoyi, Liu Pan, Li Kai, Sheng Xingyue, Li Lu
Journal of China & Foreign Highway
Based on the characteristics of light weight and high strength of polymer alloy materials, three new steel bridge deck pavement structures based on polymer alloy materials were proposed in this paper. Their high temperature performance, interface bonding performance, fatigue resistance, and skid resistance were investigated, and the performance performance was compared with that of traditional pavement structures. The test results show that the thickness of the pavement layer has a greater influence on the high temperature performance of “polymer alloy material + high-elasticity modified asphalt concrete SMA10” but has less influence on the high temperature performance of “polymer alloy material …
Comparative Study On Steel Bridge Maintenance And Technical Specifications Of China And The United States,
2023
JSTI Group Co., Ltd., Nanjing, Jiangsu 211112, China; 2. State Key Laboratory of Safety, Durability and Healthy Operation of Long Span Bridges, Nanjing, Jiangsu 211112, China
Comparative Study On Steel Bridge Maintenance And Technical Specifications Of China And The United States, Yang Yi, Li Chenghuan, Liu Duo, Zhang Jiandong
Journal of China & Foreign Highway
By systematically investigating the relevant codes of bridge maintenance in China and the United States, this paper compared the relevant regulations of steel bridge maintenance from the three aspects of steel bridge inspection, damage assessment, and maintenance and reinforcement and summarized the reference points of the existing maintenance codes for steel bridges, which has important reference value for improving the technical standards of steel bridge maintenance and enhancing the technical level of maintenance.
Influence Of Curvature Radius On Mechanical Properties Of Small And Medium Span Continuous Rigid Frame Bridge During Construction Stages,
2023
Pengzhou City Construction Investment Group Co., Ltd., Chengdu, Sichuan 611930, China
Influence Of Curvature Radius On Mechanical Properties Of Small And Medium Span Continuous Rigid Frame Bridge During Construction Stages, Xie Yangfu, Ye Yuansheng, Gui Shuirong, Yang Yu
Journal of China & Foreign Highway
In order to study the mechanical properties and the influence of curvature radius on the mechanical properties of curved rigid frame bridge constructed by span-by-span assembly method, this paper took the continuous rigid frame bridge with a two-box standard section (35 + 35 + 35) m of Hongdu Overpass in Nanchang City as the engineering background. By changing the curvature radius, the influence of curvature radius on the mechanical properties of small- and medium-span continuous rigid frame bridges constructed by span-by-span assembly method during construction was studied. The results show that the mechanical properties such as the main beam stress, …
Research On Monitoring And Control Of Demolition Construction Of Prestressed Concrete Continuous Beam Bridge,
2023
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China
Research On Monitoring And Control Of Demolition Construction Of Prestressed Concrete Continuous Beam Bridge, Bai Yinghua, Tang Xu
Journal of China & Foreign Highway
The demolition of an old bridge is a complex dynamic process. In order to ensure the safety of the structure in the process of bridge demolition and ensure the smooth and safe demolition of the old bridge, this paper took the demolition construction of a three-span prestressed concrete continuous beam bridge as an example, established the space model of the whole bridge through the finite element simulation modeling software Midas Civil, and calculated the stress and deformation of the structure at each construction stage. At the same time, the stress and linear changes of the main beam at each construction …
