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Articles 211 - 240 of 410
Full-Text Articles in Transportation Engineering
Experimental Study On Fracture Performance Of Emulsified Asphalt Cold Recycled Mixture, Chu Chenfeng, Deng Jun, Zhou Chen, Wang Zi ’Ang, Kuang Ao, Liu Hongfu
Experimental Study On Fracture Performance Of Emulsified Asphalt Cold Recycled Mixture, Chu Chenfeng, Deng Jun, Zhou Chen, Wang Zi ’Ang, Kuang Ao, Liu Hongfu
Journal of China & Foreign Highway
Cracking in emulsified asphalt cold recycled pavements is one of the main constraints on their large-scale application in road engineering.To study the fracture performance indicators of cold recycled asphalt mixture and the improvement measures of crack resistance performance，this study investigated three types of mixtures：ordinary emulsified asphalt，basalt fiber，and styrene-butadiene rubber （SBR） modified emulsified asphalt.This study conducted a four-point bending strength test on notched beams，and acoustic emission tests of the beam with prefabricated cracks were carried out to evaluate the fracture performance of three different emulsified asphalt cold recycled mixtures in road engineering.The evaluation criteria included strain energy release rate，stress intensity factor，energy …
Experiment On Strength And Deformation Characteristics Of Marine Silt Cement Soil And Their Relationship, Deng Wu, Liu Weizheng, Chen Tie, Ge Mengyuan
Experiment On Strength And Deformation Characteristics Of Marine Silt Cement Soil And Their Relationship, Deng Wu, Liu Weizheng, Chen Tie, Ge Mengyuan
Journal of China & Foreign Highway
In order to study the compre ssive，flexural，and shear strength and deformation characteristics of marine silt cement soil，a series of laboratory mix ratio tests were carried out，so as to test the changes in unconfined compressive strength fcu，flexural strength ff，normalized shear strength τqg，normalized principal stress difference （σ1‒σ3）/σ3，and compression modulus Es under different dosage of curing agents，curing ages，and cement-to-lime ratios.In addition，the correlation between different parameters was investigated.The results show that the performance of the improved samples with cement and lime is 2%‒17% higher than that with cement alone under the same dosage.The strength of cement soil is proportional to the dosage and age …
Experimental Research On Anti-Uv Aging Performance Of Tire Pyrolysis Carbon Black （Tpcb） Modified Asphalt, Yang Wansheng, Yi Shuaibing, Dai Tianle, Li Tiantian, Gan Youwei
Experimental Research On Anti-Uv Aging Performance Of Tire Pyrolysis Carbon Black （Tpcb） Modified Asphalt, Yang Wansheng, Yi Shuaibing, Dai Tianle, Li Tiantian, Gan Youwei
Journal of China & Foreign Highway
To investigate the anti-ultraviolet （UV） aging performance of waste tire pyrolysis carbon black （TPCB）-modified asphalt，TPCB-modified asphalt was prepared and subjected to UV aging tests alongside the base asphalt at various intervals.The micro changes and surface roughness of two kinds of asphalt surfaces were studied by atomic force microscopy （AFM）.The behavior changes in ductility，softening point，and penetration of two asphalts before and after UV aging were tested by asphalt performance tests.The results show that the reduction height of TPCB-modified asphalt is smaller than that of base asphalt，and the surface roughness is larger than that of base asphalt at each time.The performance change …
Experimental Study On Double‑Mixture Solidification And Ratio Optimization Of Dredger Fill Sludge, Qin Liang, Chen Zhimin, Lu Yongfei
Experimental Study On Double‑Mixture Solidification And Ratio Optimization Of Dredger Fill Sludge, Qin Liang, Chen Zhimin, Lu Yongfei
Journal of China & Foreign Highway
In order to study the optimal r atio of cement and calcium oxide by double-mixture solidification for improving dredger fill sludge，the soil modification results by double-mixture solidification were analyzed based on orthogonal experiments.Finally，the fuzzy comprehensive evaluation method was used to quantitatively optimize each ratio scheme.The results show that：① Under the same addition ratio （addition amount of 1.0%‒4.0%），there is a positive linear correlation between the optimal moisture content and the addition amount，and there is a negative linear correlation between the optimal moisture content and the maximum dry de nsity.Under non-equal addition ratios，the law is not obvious.However，compared to cement，the water-reducing effect of …
Study On Compression Characteristics Of Solidified Mud‑Sand Mixed Fillers Considering Particle Breakage, Han Chao, Yu Yuezhong, Bai Bin, Xu Zhihao, Zhang Xianmeng, Liu Yinying, Kong Shuoying
Study On Compression Characteristics Of Solidified Mud‑Sand Mixed Fillers Considering Particle Breakage, Han Chao, Yu Yuezhong, Bai Bin, Xu Zhihao, Zhang Xianmeng, Liu Yinying, Kong Shuoying
Journal of China & Foreign Highway
The mixed filler of solidified mud and sand provides an ideal solution for the resourceful disposal of wasted engineering mud，and the compression characteristics of filling engineering are closely related to the strength characteristics and particle breakage characteristics of mixed fillers.This study conducted large size compression tests on mixed fillers with different particle gradations and established a discrete element method （DEM） model that incorporated particle breakage for the side-limited compression tests of solidified mud-sand mixed fillers.The changes in the compression modulus of the mixed fillers and the amount of solidified soil particle breakage during compaction were investigated.The study placed a special …
Road Performance Of Reclaimed Asphalt Mixture Mixed With Bagasse Fibers And Rubber‑Modified Asphalt, Jiang Xin
Road Performance Of Reclaimed Asphalt Mixture Mixed With Bagasse Fibers And Rubber‑Modified Asphalt, Jiang Xin
Journal of China & Foreign Highway
Given the potential resource value of rec laimed asphalt pavement，waste rubber powder，and bagasse fibers，it is meaningful to develop the cooperative utilization of various solid wastes.This paper studied the microstructure and thermal characteristics of bagasse fibers，carried out the mix design of a reclaimed asphalt mixture with bagasse fibers and rubber-modified asphalt，and evaluated its road performance.At the same time，the test road was paved successfully and observed for a time.The results show that the hollow lumen with multilayer fiber structure in bagasse fibers contributes to absorbing free asphalt in mixtures and enhances the adhesion between bagasse fibers and asphalt.The thermal properties of bagasse …
Experimental Study On Static And Dynamic Mechanical Properties Of Pva Fiber‑Reinforced Coral Concrete, Zhou Jinyi, Long Zhilin, Guo Ruiqi, Kuang Dumin, Cai Yang, Chen Shasha, Chen Jinjie
Experimental Study On Static And Dynamic Mechanical Properties Of Pva Fiber‑Reinforced Coral Concrete, Zhou Jinyi, Long Zhilin, Guo Ruiqi, Kuang Dumin, Cai Yang, Chen Shasha, Chen Jinjie
Journal of China & Foreign Highway
To enhance the mechanical properties of coral concrete，static mechanical tests were conducted at five polyvinyl alcohol fiber volume fractions （0，0.5%，1%，1.5% and 2%）.The impact compression properties were investigated under four strain rates using a split Hopkinson pressure bar with a diameter of 100 mm.The results show that the incorporation of an appropriate number of fibers can significantly improve the static compressive strength and splitting tensile strength of concrete.Dynamic mechanical tests show that coral concrete has an obvious strain rate effect，and the incorporation of fibers can improve the sensitivity of the dynamic reinforcement factor to strain rate，with the reinforcement effect becoming saturated …
Feasibility Of Sandstone Used In Asphalt Pavement Of Expressways, Lou Jianmin, Meng Xiandong, Song Zhike, Zhao Lidong, Bai Julong, Zhao Shengli, Zhu Jishuang
Feasibility Of Sandstone Used In Asphalt Pavement Of Expressways, Lou Jianmin, Meng Xiandong, Song Zhike, Zhao Lidong, Bai Julong, Zhao Shengli, Zhu Jishuang
Journal of China & Foreign Highway
In order to explore the feasibility of applying sandstone in the asphalt pavement of expressways，the physical and mechanical indexes of sandstone and limestone aggregate were compared，and the high temperature performance，low temperature performance，and water stability of asphalt mixture were studied from the aspects of grading type，asphalt type，and aggregate lithology.The results show that the road performance of asphalt mixture synthesized by clean and regular sandstone aggregate meets the requirements of current specifications.At the same time，the comprehensive road performance of sandstone asphalt mixture with 1% anti-stripping agent has been improved.
Mechanical Performance Of Uhpc Building Envelope Based On Topological Optimization And Modular Composition, Zhou Zhixuan, Jiang Youbao, Liu Jun, Xiang Yi, Zhou Hao
Mechanical Performance Of Uhpc Building Envelope Based On Topological Optimization And Modular Composition, Zhou Zhixuan, Jiang Youbao, Liu Jun, Xiang Yi, Zhou Hao
Journal of China & Foreign Highway
To ensure a safe，aesthetic，and lightweight building envelope，an ultra-high performance concrete （UHPC） building envelope and its node connection mode were proposed based on topological optimization and modular composition.Firstly，the UHPC building envelope was optimized by using the method of minimizing structural compliance subjected to given material volume constraints，and the mechanical performance before and after optimization was compared.The modular design was adopted，and the optimization result of the most unfavorable stress area in the model was taken as the basic configuration unit.Then，UHPC tenon and mortise nodes were proposed，which could be simply assembled into modules.By considering the weak mechanical performance of nodes，the finite element analysis …
Key Techniques For Demolition Of Multi‑Span Continuous Arch Bridge With Concrete‑Filled Steel Tubes, Wan Chengf U, Zeng Wenli
Key Techniques For Demolition Of Multi‑Span Continuous Arch Bridge With Concrete‑Filled Steel Tubes, Wan Chengf U, Zeng Wenli
Journal of China & Foreign Highway
Taking the demolition project of Jianhu Bridge as the research background，the demolition of arch bridges with concrete-filled steel tubes under complex conditions was studied.First，the current bridge demolition methods and application status were introduced，and three bridge demolition schemes were put forward according to the difficulties of the bridge demolition.The appropriate demolition scheme for the bridge was selected after comparison，and the sequence of arch bridge demolition was explained.Then，the stress characteristics of the bridge at each construction stage were analyzed，and the theoretical and measured displacement and stress at the most unfavorable stage during demolition were compared.Finally，the influence of material strength and temperature on …
Mesoscopic Numerical Simulation Of Concrete Cracking Caused By Nonuniform Corrosion Of Strands, Zeng Tianbao, Chen Hong, Huang Xiaoqi, Tu Ronghui, Dai Lizhao
Mesoscopic Numerical Simulation Of Concrete Cracking Caused By Nonuniform Corrosion Of Strands, Zeng Tianbao, Chen Hong, Huang Xiaoqi, Tu Ronghui, Dai Lizhao
Journal of China & Foreign Highway
The non-uniform corrosion of spinning strands will induce concrete cracking.A non-uniform expansion model of corrosion products of strands was established，and a mesoscopic numerical model of concrete cracking caused by non-uniform corrosion of strands was built.Concrete was considered as a three-phase composite material composed of mortar matrix，aggregate，and interface layer.The concrete cracking behavior caused by the non-uniform corrosion of strands was simulated by embedding cohesive elements.The rationality of the proposed model was verified by existing experimental data，and the influence of protective layer thickness and aggregate content of concrete on the width of corrosion-induced cracks was discussed.The results show that the proposed non-uniform …
Parameter Sensitivity Analysis Of Single‑Tower Cable‑Stayed Bridge With Mixed Beam, Chen Kongliang, Ye Jianxin, Xu Yufeng, Huang Zhuobin, Guo Fengtao
Parameter Sensitivity Analysis Of Single‑Tower Cable‑Stayed Bridge With Mixed Beam, Chen Kongliang, Ye Jianxin, Xu Yufeng, Huang Zhuobin, Guo Fengtao
Journal of China & Foreign Highway
To improve the efficiency of the review simulation model of the bridge monitoring unit and study the influence of different parameters of the single-tower mixed beam cable-stayed bridge on the bridge ’s completed state in the construction process，this paper，taking the cable-stayed bridge of Tongji Road in Foshan with a span of （200+68+46） m as the engineering background，adopted the single control variable method and response surface-Monte Carlo method for sensitivity analysis.Taking the main beam alignment，main tower alignment，main beam stress，and the variation of cable-stayed bridge force as control objectives，this paper studied the influence of the variation of main beam weight，initial tensile force，and …
Key Technology And Numerical Simulation Of Cast‑In‑Place Construction Of Main Arch Ring Of Reinforced Concrete Arch Bridge Based On Suspension Steel Arch Method, Su Xueping, Xia Zhengzhi, Lyu Songgang, Duan Pengjie, Lyu Yigang
Key Technology And Numerical Simulation Of Cast‑In‑Place Construction Of Main Arch Ring Of Reinforced Concrete Arch Bridge Based On Suspension Steel Arch Method, Su Xueping, Xia Zhengzhi, Lyu Songgang, Duan Pengjie, Lyu Yigang
Journal of China & Foreign Highway
Steel arch frame replaced such construction methods as floor bracket or segment cantilever assembly and it was applied to arch circle cast-in-place across deep water canyons in mountainous areas，which had certain advantages and was worth promoting and applying.By introducing the key construction technologies of Sanchahe Bridge，including steel arch frame cantilever fastener method assembly，arch water tank method precompression，and main arch ring layered pouring，the common problems in the construction process of crossing the deep water canyon were solved effectively.Based on Midas Civil overall modeling of finite elements，the key construction technologies adopted by the bridge were numerically simulated and analyzed，and the successful construction …
Design And Installation Technology Of Hanging Basket For Long‑Span Concrete Girder Cable‑Stayed Bridge, Zeng Xianliu, Pang Jianguo, Chen Cheng
Design And Installation Technology Of Hanging Basket For Long‑Span Concrete Girder Cable‑Stayed Bridge, Zeng Xianliu, Pang Jianguo, Chen Cheng
Journal of China & Foreign Highway
The main bridge of Zhungeer Yellow River Super Major Bridge is a （160+440+160） m double tower double cable plane full floating system concrete grider cable-stayed bridge.The main beam is a 28.4m wide double box prestressed concrete structure.It was constructed by cantilever pouring with a front fulcrum hanging basket.The maximum weight of the cantilever pouring section is 5 800 kN.To ensure the integral rigidity of the hanging basket，the hanging basket bearing platform adopted the steel box girder structure.The long and large components were connected by high-strength bolts made in sections to facilitate the transportation and installation of the hanging basket.The hanging …
Key Construction Techniques For Emended Cap Unsealed Bottom Of Deep‑Water Hard Rock, Zeng Jian, Guan Xiaohui, Guo Zhiwei
Key Construction Techniques For Emended Cap Unsealed Bottom Of Deep‑Water Hard Rock, Zeng Jian, Guan Xiaohui, Guo Zhiwei
Journal of China & Foreign Highway
In the construction of a deep-water embedded cap foundation，it was required to excavate the mud surface to the depth below sealing concrete and clean the bottom carefully，ensuring the height and quality of bottoming concrete.For hard rock under good geological conditions，there exist such problems as difficulty in excavation，long excavation time consumption，and high construction cost.Based on the construction of the main pier caps of the Chongqing Jiahua Metro Bridge，this paper adopted the method of combining theoretical analysis，numerical calculation，and engineering implementation verification，which developed an emended cap unsealed bottom key construction techniques for deep-water hard rock.This construction technology used the method of excavating the …
Influence Of Blasting Point Position And Foundation Pit Height On Blasting Vibration During Foundation Pit Blasting Excavation, Liu Kuan, Xu Zhihao, Tang Yuan, Shen Jun, Bao Xiaohua, Shen Pinghuan, Ou Yang
Influence Of Blasting Point Position And Foundation Pit Height On Blasting Vibration During Foundation Pit Blasting Excavation, Liu Kuan, Xu Zhihao, Tang Yuan, Shen Jun, Bao Xiaohua, Shen Pinghuan, Ou Yang
Journal of China & Foreign Highway
In view of inaccurate vibration prediction of foundation pit blasting，the influence of blasting point position and foundation pit height on vibration during foundation pit blasting excavation was studied by using finite element simulation software.First，based on the foundation pit blasting excavation of the Mawan Cross-Sea Passage，a numerical simulation was carried out to verify the applicability of the model.Then，under unchanged blasting center distance，the distance from the blasting point to the edge of the foundation pit and the foundation pit height were changed respectively，and the influence of these two factors on surface vibration was studied.The results show that a greater distance from the …
Reasonable Construction Method For Grade Ⅳ Surrounding Rock In Single‑Hole Four‑Lane Super‑Span Highway Tunnel, Li Heyin, Gao Jingming, Li Yanfeng, Xun Wenjie, Dong Fangfang, Zhang Jiangang
Reasonable Construction Method For Grade Ⅳ Surrounding Rock In Single‑Hole Four‑Lane Super‑Span Highway Tunnel, Li Heyin, Gao Jingming, Li Yanfeng, Xun Wenjie, Dong Fangfang, Zhang Jiangang
Journal of China & Foreign Highway
In order to study the reasonable constr uction method of super-span highway tunnels，the Xinghuacun No.1 tunnel included in the reconstruction and expansion project of the Xiaocaohu –Urumqi section of the Lianyungang –Khorgos Expressway in Xinjiang was studied.The numerical simulation method was used to analyze the deformation and stress of the supporting structure of the Grade tisurrounding rock in the super-span highway tunnel constructed by the center diaphragm （CD） method，the upper-bench CD method，and the three-bench and seven-step excavation method.Under the premise that the deformation and the stress of the supporting structure met the design requirements，the advantages and disadvantages of each construction …
Excavation Method For Ⅴⅴ‑Grade Surrounding Rock Of Double‑Hole Eight‑Lane Super‑Long‑Span Tunnel, Shi Youzhi, Liu Xudong, Yong Jinzhu
Excavation Method For Ⅴⅴ‑Grade Surrounding Rock Of Double‑Hole Eight‑Lane Super‑Long‑Span Tunnel, Shi Youzhi, Liu Xudong, Yong Jinzhu
Journal of China & Foreign Highway
In order to reduce the adverse effect of back heading blasting on the completed supporting structure at the entrance of a double-hole eight-lane super-long-span tunnel with Ⅴ-grade surrounding rock，the Niuzhaishan tunnel project in Pingtan was taken as an example.The original design of the double-side heading method is easy to cause the collapse of the temporary steel support that has been completed when blasting happens near the back heading.In view of this，this paper put forward scheme 1 of canceling the temporary transverse support and the up-and-down step method with vertical support （scheme 2）.It then used the finite element method to calculate …
Influence Of Concrete Barrier Slope Parameters On Protective Effect Against Vehicle Collision, Gong Shuai
Influence Of Concrete Barrier Slope Parameters On Protective Effect Against Vehicle Collision, Gong Shuai
Journal of China & Foreign Highway
In order to study the influence of concrete barrier slope parameters on the protective effect against vehicle collision，the vehicle models and concrete barrier models were established.The validity of these models was verified using the real vehicle test data.Then，the collision analysis was conducted on the single-slope concrete barrier with different slopes，improved concrete barrier with different slope parameter combinations，and reinforced concrete barrier with anti-climbing function by using the validated models，respectively.The results show that the slope is the key parameter that affects the protective performance of the single-slope barrier，and vehicles cannot be effectively protected if the slope is too small or too large.The …
Design And Evaluation Of Land‑Saving And Beautiful Median Barriers, Li Jingjun, Wa Ng Xin, Qi Jie, Wang Zijian, Liu Siyuan
Design And Evaluation Of Land‑Saving And Beautiful Median Barriers, Li Jingjun, Wa Ng Xin, Qi Jie, Wang Zijian, Liu Siyuan
Journal of China & Foreign Highway
During the construction and expansion of expressways and national and provincial highways，more diversified requirements have been put forward for the median barrier，including reliable protective performance，small footprints，beautiful traffic environments，and economic costs.However，the existing median barrier achievements still have some shortcomings.In order to better meet the design and use needs of median barriers for highways，theoretical analysis，computer simulation，and full-scale impact tests with real vehicles were adopted，and the force characteristics of different types of median barriers were analyzed.A new design concept of beam-column integration was put forward.Through systematic research on the barrier height，width，beam，column，foundation，and other structures，a land-saving and beautiful median barrier was developed.The median barrier had …
Guardrail Improvement For Old Bridges In Expressways, Liu Xinping, Zhang Shihui, Shang Zhongping, Han Yue, Zhang Qiang
Guardrail Improvement For Old Bridges In Expressways, Liu Xinping, Zhang Shihui, Shang Zhongping, Han Yue, Zhang Qiang
Journal of China & Foreign Highway
In view of the insufficient protection grade of the guardrail in old bridges，a combined guardrail suitable for the low concrete wall guardrail in the old bridge was designed and developed by using finite element analysis while not damaging the main structure of the bridge.The protection grade was verified to reach SA grade through a full-scale vehicle collision test.The guardrail was designed with new high-strength alloy steel，with light weight and beautiful appearance.There was no need to dismantle the original concrete foundation in the old bridge，which is convenient for construction and requires low cost.Therefore，it is worth being popularized and applied in the …
Research And Field Test On Ultra‑Thin Wearing Course Based On Balanced Design Concept, Gu Jianjun, Li Xia, Li Atan, Sun Qiang, Li Jie, Jiang Zhaowei
Research And Field Test On Ultra‑Thin Wearing Course Based On Balanced Design Concept, Gu Jianjun, Li Xia, Li Atan, Sun Qiang, Li Jie, Jiang Zhaowei
Journal of China & Foreign Highway
To address the application of an ultra-thin wearing course in expressway asphalt pavement maintenance engineering，the ultra-thin wearing course system based on the balance design concept was systematically studied.In this paper，the action mechanism and application characteristics of modifiers were analyzed，and the proportion design test of the ultra-thin wearing course was designed based on the balance design method.Finally，according to the proportion design test，the optimal proportion of the ultra-thin wearing course material was selected for test road paving.Research shows that the direct-cast high viscosity modifier is convenient for transportation and storage，improves the elastic recovery of asphalt mixtures and reduces permanent deformation.Under the condition …
Intelligent Bridge Lifecycl E Maintenance System Based On Long‑Term Inspection, Ye Zhiwei, Zhang Jiaxin, Tan Haishan, Fan Lei, He Wen, Dong You, Wu Wanglin
Intelligent Bridge Lifecycl E Maintenance System Based On Long‑Term Inspection, Ye Zhiwei, Zhang Jiaxin, Tan Haishan, Fan Lei, He Wen, Dong You, Wu Wanglin
Journal of China & Foreign Highway
The current bridge maintenance sy stem in China primarily relies on bridge inspection data to prioritize the state of bridges and allocate a limited budget accordingly.This strategy focuses on repairing bridges with low performance，concentrating on restorative maintenance but ignoring preventive maintenance.In view of the total lifecycle cost，the repair-oriented method may require a lower initial investment but leads to significant resource consumption in the mid to late stages.Based on existing highway bridge maintenance systems，an intelligent maintenance system relying on Chinese standards and bridge inspection data and combining repair and prevention was developed.The system model mainly consisted of two modules：the bridge performance …
Improvement Of Gravelly Laterite And Cement Stable Disposal In West Africa, Jin Haibing, Yi Zicheng, Zhuo Rong
Improvement Of Gravelly Laterite And Cement Stable Disposal In West Africa, Jin Haibing, Yi Zicheng, Zhuo Rong
Journal of China & Foreign Highway
Owing to poor gradation and high liquid limit and plasticity index，the application of gravel laterite on road paving is limited in West Africa.To overcome this issue，laterite granule combined with sand at different content was explored.The performance including the particle composition，limit water content and CBR value was investigated.The results indicate that sand treatment can improve the gradation，enhance the compactness，and reduce the plasticity index.The improved gravel laterite can meet the requirements of subbase，cushion，and base courses.Cement treatment can improve the mechanical properties of laterite grains.Cement and sand content affect the unconfined compressive strength significantly，with an optimal sand content range identified.Specifically，laterite granules mixed with …
Addressing Data Limitations Of Commercial Waterways Via Machine Learning And Stochastic Optimization, Sanjeev Bhurtyal
Addressing Data Limitations Of Commercial Waterways Via Machine Learning And Stochastic Optimization, Sanjeev Bhurtyal
Graduate Theses and Dissertations
Freight transportation is a crucial component of the US economy, with truck, rail, and water contributing significantly to the Gross Domestic Product (GDP). However, challenges arise in maintaining infrastructure capacity to accommodate the growing tonnage and value of freight transportation. Waterways offer high efficiency and environmental friendliness, with the capacity to transport substantial cargo volumes. Utilizing waterways can alleviate bottlenecks in landside transportation, accommodating the rising tonnage of commodity flow in the US. Despite the advantages of waterway transportation, the data limitations hinder informed decision-making regarding port operation and infrastructure investment. The lack of granularity and timeliness in available data …
Does California High-Speed Rail Promote Accessibility For Station Cities?: Case Study Of Fresno And Merced, Chih-Hao Wang, Na Chen
Does California High-Speed Rail Promote Accessibility For Station Cities?: Case Study Of Fresno And Merced, Chih-Hao Wang, Na Chen
Mineta Transportation Institute
California High-Speed Rail (CHSR) will largely change transportation cost across the state after it starts operating. Past studies show that only Fresno and Merced among station cities in the Central Valley would attract more future activities with the CHSR. The establishment of active CHSR also implies a new daily living sphere for all the station cities, and, therefore, accessibility to work and residential amenities should be reviewed to inform planners of future land-use and transportation developments. A research framework has been developed better to understand the impact of CHSR on job and amenity accessibility by driving, transit, and walking in …
Investigating Rural Traffic Dynamics: A Traffic Study On E 2nd Street Intersection’S Behavior And Safety, Ma Anjelika Rose T. Pineda
Investigating Rural Traffic Dynamics: A Traffic Study On E 2nd Street Intersection’S Behavior And Safety, Ma Anjelika Rose T. Pineda
2024 Spring Honors Capstone Projects - Archive
Traffic studies guide engineers in designing road networks to ensure smooth traffic flow and public safety. Such studies assess the need for traffic control devices to manage vehicle flow safely and efficiently. This is crucial at intersections which pose high risks of collision and congestion. A traffic analysis at the intersection of Island Grove and E 2nd Street on the FM-4 roadway in Cleburne, TX was conducted to evaluate the sufficiency of the current traffic control device. TxDOT warrants and standards and a field study were utilized and performed to justify the substitution for a traffic signal at the intersection. …
Emergency Vehicle Prioritization In Connected And Autonomous Traffic., Mohamadreza Haghani
Emergency Vehicle Prioritization In Connected And Autonomous Traffic., Mohamadreza Haghani
Electronic Theses and Dissertations
Reducing the response time of emergency vehicles (EV) is highly important due to the relationship between response time and fatality rate. Emerging technologies can help reduce response time by enhancing EV prioritization. On the other hand, EV prioritization can negatively impact general traffic especially in cross streets of signalized intersections. In this research, three main objectives were followed. Firstly, creation and dissipation of EVP disruption on arterial cross streets was studied to recommend solutions to prevent this disruption. Secondly, lane-changing and stopping behavior of CAVs were studied in EV prioritization to identify the best lane-changing behavior through minimizing delay. Thirdly, …
Balancing Environmental Clearances With Construction Work Zone Needs, Chris Van Dyke, Steve Waddle, Ying Li
Balancing Environmental Clearances With Construction Work Zone Needs, Chris Van Dyke, Steve Waddle, Ying Li
Kentucky Transportation Center Research Report
On small, single-span bridge projects (< 100 feet), the Kentucky Transportation Cabinet (KYTC) during project development works to establish an environmentally clear area (ECA) large enough to accommodate contractor operations. An adequately sized ECA gives contractors sufficient room to have materials delivered, park vehicles, store materials, and maneuver equipment around the project site (e.g., cranes, drill rig). If a contractor finds an ECA is too small to support their operations, they are responsible for obtaining additional environmental clearances. Clearing additional areas following the project award can slow down project delivery. To reduce the likelihood of contractors needing to enlarge an ECA, this report includes four documents KYTC can implement immediately to streamline and clarify the environmental clearances process. They include a checklist that project managers can use to coordinate the work of project team members and verify environmental clearances are on track, a combined environmental clearances workflow and best practices document for use by environmental subject-matter experts (SMEs), proposed language that can be inserted into project proposals that describes the environmental clearance process and specifies materials the Cabinet will hand off to contractors showing the location of the ECA, and a one-page explainer for contractors describing the environmental clearances process. Taken together, these deliverables emphasize the importance of early and ongoing coordination among project team members, clearing as much area as practical in and around bridges, and being transparent with contractors about their responsibilities.
Dynamic Impact Testing And Numerical Analysis Of Non-Proprietary Astm F2656-20 M50 Anti-Ram Barrier Components, Weston Kelley
Dynamic Impact Testing And Numerical Analysis Of Non-Proprietary Astm F2656-20 M50 Anti-Ram Barrier Components, Weston Kelley
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
In a post-9/11 world, hostile actors are using vehicles as weapons to inflict civilian casualties. Pedestrians, vulnerable road users, military personnel, and police may be targeted using a vehicle as a weapon. The United States Department of Defense (DoD) also utilizes Entry Control Facilities (ECFs) which are carefully designed transportation corridors to manage how threat vehicles are able to access military facilities. In 2004, DoD started to upgrade all ECFs using both passive and active barriers. Many anti-ram vehicle barriers were evaluated according to the criteria established in ASTM F2656, but to date few options are available which are (1) …