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Experimental Study On Fatigue Performance Of Steel Fiber Reinforced Concrete-Orthotropic Composite Bridge Deck, Ye Huawen, Tang Shiqing, Duan Zhichao, Yang Zhe Jun 2022

Experimental Study On Fatigue Performance Of Steel Fiber Reinforced Concrete-Orthotropic Composite Bridge Deck, Ye Huawen, Tang Shiqing, Duan Zhichao, Yang Zhe

Journal of China & Foreign Highway

Orthotropic steel bridge decks are prone to fatigue cracking. The adoption of steel fiber reinforced concrete (SFRC) composite bridge decks is one of the solutions. Through the wheeled rolling loading fatigue test simulating the actual wheel load on the full-scale model of the SFRC composite bridge deck, three connection methods, namely adhesive, stud, and a mixture of adhesive and stud, were respectively adopted between the concrete layer and the orthotropic steel bridge deck structure layer to study the fatigue deformation of the composite bridge deck and the failure evolution mode of each component. Then, the crack development behavior of the …

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Research On Key Construction Technology Of Adjacent Double-Arch Tunnel To Existing Tunnel Under Thick Filling Platform, Mo Kun, Dai Jiabao, Luo Lijuan, Dang Nan, Ma Jiakuan, Zhu Junhui Jun 2022

Research On Key Construction Technology Of Adjacent Double-Arch Tunnel To Existing Tunnel Under Thick Filling Platform, Mo Kun, Dai Jiabao, Luo Lijuan, Dang Nan, Ma Jiakuan, Zhu Junhui

Journal of China & Foreign Highway

Based on the shallow-buried underground excavation project of the double-arch tunnel at the entrance and exit line of Yanming Lake Parking Lot of Xi’an Metro Line 5, and in accordance with the thick fill soil layer of the site and the engineering conditions of the existing sections near the site, this paper proposed several key construction techniques for small-section double-arch metro tunnels in loess areas. The feasibility of the construction of the middle guide tunnel + upper and lower step method was verified by means of numerical analysis. Meanwhile, different forms of advanced support methods were adopted according to the …

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Research On Influence Of Bearing Sliding Plate Wear On Seismic Performance Of Multi Tower Cable-Stayed Bridge, Luo Legen, Zhang Xun, Zhang Jingyue Jun 2022

Research On Influence Of Bearing Sliding Plate Wear On Seismic Performance Of Multi Tower Cable-Stayed Bridge, Luo Legen, Zhang Xun, Zhang Jingyue

Journal of China & Foreign Highway

To study the influence of sliding plate wear of the bearing on the seismic performance of multi-tower cable-stayed bridge structures, the wear performance test of the sliding plate of the bearing replaced by a certain in-service bridge was carried out to study the friction coefficient of the sliding plate of the bearing at different wear stages throughout the entire service process. By taking the Huangmaohai Bridge as the engineering background, a spatial three-dimensional finite element model was established to compare the seismic responses of the bridge structure under different wear degrees of the bearing plates. The research results show that …

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Improved Method For Calculating Design Position Of The Cable Saddle On Suspension Bridge, Deng Xiaokang, Deng Hengyao Jun 2022

Improved Method For Calculating Design Position Of The Cable Saddle On Suspension Bridge, Deng Xiaokang, Deng Hengyao

Journal of China & Foreign Highway

Based on the analysis of the geometric and mechanical relationship between the main cable and the cable saddle of the suspension bridge, the equation was established by using the geometric compatibility conditions of the cable saddle and the main cable. The design position of the cable saddle was obtained by solving the equation using the dichotomy, avoiding the complex calculation of solving the eight-element nonlinear equation system using the Newton-Raphson method in the traditional method. The improved algorithm for the cable saddle position proposed in this paper has good accuracy and simple calculation. The entire calculation process does not require …

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Key Technology Of Suspender Replacement For Arch Bridge Under The Requirement Of Heavy Load And Tarffic Demand Protection, Yang Hao, Lu Wensheng Jun 2022

Key Technology Of Suspender Replacement For Arch Bridge Under The Requirement Of Heavy Load And Tarffic Demand Protection, Yang Hao, Lu Wensheng

Journal of China & Foreign Highway

When the service life of the suspension rods of arch bridges approaches their designed service life, suspension rod replacement is often carried out. However, at present, cases of replacing the suspension rods of the arch bridge under traffic conditions in China are still relatively rare. Considering the actual operational requirements for heavy load and traffic demand protection of arch bridges, this paper discussed the optimization of the main processes during the replacement of suspension rods, proposed correction methods for key parameters such as monitoring the influence of environmental temperature and vehicle loads during the construction process, as well as an …

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Analysis On The Causes Of Cracks In Bottom Plate Of Box-Girder In Wide Non-Cable Area Of The Extradossed Cable-Stayed Bridge, Wu Yunpeng, Chen Jingwei, Zhou Tianying Jun 2022

Analysis On The Causes Of Cracks In Bottom Plate Of Box-Girder In Wide Non-Cable Area Of The Extradossed Cable-Stayed Bridge, Wu Yunpeng, Chen Jingwei, Zhou Tianying

Journal of China & Foreign Highway

Large-sized prestressed reinforced concrete box girder makes it easy to produce floor cracks due to construction temperature. In view of the floor cracks of a short tower cable-stayed wide box girder in Nanchong, Sichuan Province at the beginning of construction, a mixed element calculation model was established to simulate the stress calculation of the effects of temperature difference of hydration heat, sunshine temperature difference, overall cooling, and their combination factors on the floor of 7# section box girder. The stresses in some areas of the floor under the combined conditions of Ⅰ, Ⅳ, and Ⅴ reached 2.0, 4.0, and 4.9 …

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Fatigue Performance Analysis Of Welding Details Of Steel Orthotropic Plate-Truss Composite Beams, Huang He, Qin Pan Jun 2022

Fatigue Performance Analysis Of Welding Details Of Steel Orthotropic Plate-Truss Composite Beams, Huang He, Qin Pan

Journal of China & Foreign Highway

Three structural details of a certain orthotropic plate steel truss composite beam were fabricated as specimens. Their fatigue properties were studied by combining static load tests, cyclic loading of fatigue tests, and the finite element method. The results show that the fatigue cracking position of the welded clamping plate of the bridge deck is in the middle part, and the crack starts to expand from the inside, indicating that the weld here is relatively weak. The reason is that the cross-sectional area of the middle clamping plate part is small. Under the action of cyclic load, it continuously bears a …

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Stability Analysis Of Tower Super-High Support Of The Circular Arch Cable-Stayed Bridge, Wang Shuliang Jun 2022

Stability Analysis Of Tower Super-High Support Of The Circular Arch Cable-Stayed Bridge, Wang Shuliang

Journal of China & Foreign Highway

Based on the research background of the construction of over 80 m tubular steel support in the bridge tower closure section of a cable-stayed bridge, the current research and application status of the support were introduced, and the necessity of the research of the ultra-high support was clarified. The finite element method calculation theory of the support stability analysis method was introduced in detail, and the finite element method was used to analyze the influence of wind load, constraint conditions, and initial defects on the stability of the tubular steel support. Based on the characteristics of the first-order buckling mode …

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Stress Analysis Of Steel Bellows Culvert With High Fill And Large Aperture In Collapsible Loess Region, Jie Weijiang, Liang Kai, Hu Bin, He Qiang Jun 2022

Stress Analysis Of Steel Bellows Culvert With High Fill And Large Aperture In Collapsible Loess Region, Jie Weijiang, Liang Kai, Hu Bin, He Qiang

Journal of China & Foreign Highway

Relying on the experimental project, the force characteristics during the construction process of steel bellow culverts with high-fill subgrade and large aperture in collapsible loess region were tested, and the variation laws of the inner wall strain and the radial earth pressure on the outer wall of the pipe at different angles were obtained. The following conclusions were drawn through the research: Alternating tensile and compressive strain changes occur at the crest, trough, and wave side in the early stage of filling, and the stress at each angle is redistributed. The growth is rapid in the middle stage of filling …

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Effect Of Limestone Powder On Strength Of Cement Mortar And Its Mechanism, Lv Xiaowu, Zhao Yongwei, Yan Yongliang Jun 2022

Effect Of Limestone Powder On Strength Of Cement Mortar And Its Mechanism, Lv Xiaowu, Zhao Yongwei, Yan Yongliang

Journal of China & Foreign Highway

This paper studied the influence of the dosage and fineness of limestone powder on the compressive strength of mortar. Based on the heat of hydration test and the boundary nucleation and growth model, the hydration kinetics parameters of the cement paste were calculated. The pore structure of the mortar was analyzed through a capillary water absorption test and mercury pressure test, revealing the mechanism of limestone powder on the compressive strength of mortar. The results show that with the increase in the dosage of limestone powder, the compressive strength of the mortar gradually decreases. When the dosage increases to 30%, …

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Low Temperature Performance Of Modified Asphalt Mixtures With Warm Mix Rubber Powder, Zhang Fei, Wang Lan, Xing Yongming Jun 2022

Low Temperature Performance Of Modified Asphalt Mixtures With Warm Mix Rubber Powder, Zhang Fei, Wang Lan, Xing Yongming

Journal of China & Foreign Highway

To study the influence of the mesh size of rubber powder in warm-mixed asphalt mixture and the warm-mixed agent on the low-temperature performance of rubber powder-modified asphalt mixture, the bending and bending creep tests of rubber powder-modified asphalt mixture with different mesh sizes before and after warm mixing were carried out. The results show that the low-temperature performance of the modified asphalt mixture with rubber powder is improved after warm mixing, and the low-temperature performance of the 60-mesh modified asphalt mixture with rubber powder is always better than that of the corresponding mixed mesh modified asphalt mixture with rubber powder. …

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Study On Influence Of Aggregate Density Difference And Compaction Temperature On Mixing Proportions Of Asphalt Mixture, Huang Bo, Li Chaoyuan, Hao Zhi, Bai Tao Jun 2022

Study On Influence Of Aggregate Density Difference And Compaction Temperature On Mixing Proportions Of Asphalt Mixture, Huang Bo, Li Chaoyuan, Hao Zhi, Bai Tao

Journal of China & Foreign Highway

To clarify the influence of aggregate density differences and forming temperature on the mix ratio of asphalt mixtures, this paper first demonstrated the reasons for the change in volume gradation when weighing coarse and fine aggregates with large density differences. Through laboratory tests, it was confirmed that the differences in aggregate density and forming temperature had an impact on the optimal oil-to-stone ratio of asphalt mixtures. Then, Marshall specimens were formed by mass gradation and volume gradation, respectively, and their volume indicators were calculated. Meanwhile, the influence of compaction temperature on the volume indicators of Marshall specimens was analyzed. Finally, …

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Study On Performance Of High Performance Magnesium Phosphate Cement Repair Materials, Liu Tao, Li Chunwei Jun 2022

Study On Performance Of High Performance Magnesium Phosphate Cement Repair Materials, Liu Tao, Li Chunwei

Journal of China & Foreign Highway

In recent years, the sound development of China’s high-speed railways is stable. The high-performance concrete applied will inevitably have many damage problems in the future service process. The search for the application of new high-performance repair materials in high-speed railways has become increasingly important. This paper conducted research on the adhesion, strength, and durability of high-performance magnesium phosphate cement repair materials, and the relevant conclusions are as follows: ① The optimal alkali-acid ratio of high-performance magnesium phosphate cement repair materials is 4:1; ② The optimal dosage of composite retarder for high-performance magnesium phosphate cement repair material is 8%. The comprehensive …

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Effect Of A Vegetable Oil-Based Regenerant On Performance Of Aged Asphalt, Chang Runtian, Wang Wei, Fan Changcuan, Pei Qiang Jun 2022

Effect Of A Vegetable Oil-Based Regenerant On Performance Of Aged Asphalt, Chang Runtian, Wang Wei, Fan Changcuan, Pei Qiang

Journal of China & Foreign Highway

In this paper, a hot regenerant ZZ-1 for asphalt pavement was formulated by compounding waste vegetable oil as the main raw material with aromatic oil and a small amount of additives. The laboratory conducted a comparative test on the Fourier transform infrared spectra, thermal stability, and regeneration effect on short-term aged asphalt between the self-made regenerant and the other two commercially purchased regenerants. The results show that the indicators such as the flash point, mass loss before and after aging, and viscosity ratio of the self-made regenerant all meet the specification requirements, and the regeneration effect is better than the …

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Study On Fatigue Prediction Model Of Asphalt Mixture With High Rap Content, Sun Liangyu, Wang Meng, Zhang Xilun, Tian Pengtao, Ma Qingwei, Guo Ping Jun 2022

Study On Fatigue Prediction Model Of Asphalt Mixture With High Rap Content, Sun Liangyu, Wang Meng, Zhang Xilun, Tian Pengtao, Ma Qingwei, Guo Ping

Journal of China & Foreign Highway

The application of pavement thermal recycling technology can reduce energy consumption, thereby improving resource utilization efficiency and bringing positive impacts to society and the economy. In order to study the influencing factors and laws of the fatigue life of recycled asphalt mixtures, this paper fitted the failure life characteristics of fatigue and the relationship between fatigue life and stress ratio of asphalt mixtures with high RAP content under different stress ratios, RAP dosages, temperatures, and loading frequencies respectively. The results show that when the RAP content, stress ratio, and test temperature increase, the fatigue life of the recycled asphalt mixture …

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Research On New High Strength Asphalt And Mixture Road Performance And Engineering Demonstration Application, Chen Qilong, Tan Feng, Jin Weihua, Tang Shuangmei Jun 2022

Research On New High Strength Asphalt And Mixture Road Performance And Engineering Demonstration Application, Chen Qilong, Tan Feng, Jin Weihua, Tang Shuangmei

Journal of China & Foreign Highway

A new type of high-strength asphalt was prepared by adding high-strength modifiers and self-developed anti-rutting agents to 70# Esso heavy-duty matrix asphalt. The SHRP test and the road performance of the mixture were studied. The results show that after adding high-strength modifiers and self-developed anti-rutting agents, the anti-rutting factor and Brookfield viscosity of the new high-strength asphalt binder have been significantly improved compared with SBS modified asphalt and 70# Esso heavy-duty matrix asphalt. The PG grade of the high-strength asphalt has been raised from PG 64-22 of 70# Esso heavy-duty matrix asphalt to PG82-22, an increase of four grades. In …

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Experimental Study On Performance Of Composite Modified Marking Material With Nitrile Rubber, Yang Sanqiang, Li Pengfei, Sun Shuang, Yan Hongxia, Peng Xingzhi Jun 2022

Experimental Study On Performance Of Composite Modified Marking Material With Nitrile Rubber, Yang Sanqiang, Li Pengfei, Sun Shuang, Yan Hongxia, Peng Xingzhi

Journal of China & Foreign Highway

Road marking coating is one of the essential materials to realize the modernization of highway traffic. Based on the scientific research project of “research on environmentally friendly hot melt marking material mixed with powder nitrile rubber”, combined with laboratory tests and grey relational theory, nitrile rubber was used as a toughening and cracking agent, and castor oil was used as a plasticizer. By adjusting the proportion of other raw materials, the influence of each component on the fluidity and compressive strength of the material was analyzed. The results show that the fluidity of the material decreases with the increase in …

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Research On Effect Of "Activation" Process On The Performance Of Buton Rock Asphalt-Modified Asphalt Based On Atomic Force Microscope, Li Yafei, Fang Xiaokun, Gui Qitao Jun 2022

Research On Effect Of "Activation" Process On The Performance Of Buton Rock Asphalt-Modified Asphalt Based On Atomic Force Microscope, Li Yafei, Fang Xiaokun, Gui Qitao

Journal of China & Foreign Highway

In the process of modifying asphalt with Budun rock asphalt, in order to improve the utilization rate of Budun rock asphalt and enhance the performance of modified asphalt, this paper proposed the “activation” treatment of Budun rock asphalt, that is, the process of grinding and heating rock asphalt to make natural asphalt precipitate. Laboratory tests have found that compared with the modified asphalt without the “activation” treatment, the rock asphalt-modified asphalt after “activation” has a decreased penetration, an increased softening point, and improved ductility at 5 °C and kinematic viscosity at 135 °C. Moreover, the trend becomes more and more …

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Study On Rheological Properties And Modification Mechanism Of Crumb Rubber/Natural Asphalt Composite Modified Asphalt, Ye Changjian, Lu Shaoyi, Huang Qiushan, Li Heng, Ye Qunshan Jun 2022

Study On Rheological Properties And Modification Mechanism Of Crumb Rubber/Natural Asphalt Composite Modified Asphalt, Ye Changjian, Lu Shaoyi, Huang Qiushan, Li Heng, Ye Qunshan

Journal of China & Foreign Highway

To improve the performance of asphalt pavement, this paper prepared waste rubber powder/lake asphalt composite modified asphalt and waste rubber powder/rock asphalt composite modified asphalt, respectively, the high-temperature and low-temperature rheological properties of the composite modified asphalt were studied by dynamic shear rheometer and bending beam rheology test, and the modification mechanism of the composite modified asphalt was analyzed in combination with the infrared spectroscopy test method. The research results show that compared with matrix asphalt, the complex modulus of the two composite modified asphalts, namely rubber powder/lake asphalt and rubber powder/rock asphalt at 62 °C has increased by 423.0% …

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Analysis On The Influence Of Different Factors On The High Temperature Performance Of Composite Rubber Asphalt, Ma Qingwei, Guo Zhongyin, Li Wenbo, Guo Ping, Wang Guanghui Jun 2022

Analysis On The Influence Of Different Factors On The High Temperature Performance Of Composite Rubber Asphalt, Ma Qingwei, Guo Zhongyin, Li Wenbo, Guo Ping, Wang Guanghui

Journal of China & Foreign Highway

SBS modifiers can effectively improve the high-temperature performance of rubber asphalt and its mixtures. By taking the softening point and viscosity as the indicators characterizing the high-temperature performance of asphalt, various processes were designed to prepare composite rubber asphalt (CR/SBS). Finally, the optimal preparation process of composite rubber asphalt was selected based on the high-temperature performance. On this basis, the contents of CR and SBS and the mesh size of rubber powder of composite rubber asphalt were determined through orthogonal experiments. The influence of the number of heating times on the performance of composite rubber asphalt was explored. The results …

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Experimental Study On Bearing Ratio Of Steel Slag Clay Based On Orthogonal Design, Guo Ou, Zhang Hongri, Lan Tianzhu, Li Xiaoming Jun 2022

Experimental Study On Bearing Ratio Of Steel Slag Clay Based On Orthogonal Design, Guo Ou, Zhang Hongri, Lan Tianzhu, Li Xiaoming

Journal of China & Foreign Highway

To study the load-bearing ratio characteristics of steel slag clay, the steel slag from the aged converter of a certain steel plant in Fangchenggang and the clay from a certain first-class highway construction site were used as raw materials, and the engineering characteristics of steel slag and clay were considered comprehensively. By taking the relative incorporation amount of steel slag, aging time, and particle size of steel slag as factors, the orthogonal CBR test was conducted. Research shows that the most significant factor influencing the CBR value of clay mixed with steel slag from an aged converter is the relative …

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Research On Aging Resistance Of Nano Tio2/Mmt Composite Modified Asphalt, Liu Yi, Zou Guihua Jun 2022

Research On Aging Resistance Of Nano Tio2/Mmt Composite Modified Asphalt, Liu Yi, Zou Guihua

Journal of China & Foreign Highway

Asphalt is prone to aging during use, resulting in the reduced service life of asphalt pavement. To address this problem, nano-titanium dioxide (TiO2) and montmorillonite (MMT) were adopted to modify the anti-aging performance of asphalt. The relationship between the dosage of the modifier and the performance of the modified asphalt was analyzed by Matlab software, thereby determining the optimal dosage of the modifier. The influence of the modifier on the anti-aging performance of the modified asphalt was analyzed by using the high-temperature dynamic shear rheometer (DSR) and low-temperature bending beam rheology (BBR) tests. Finally, scanning electron microscope (SEM) and gel …

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Effect Of Nano-Metakaolin On Durability Performance Of Concrete, Peng Chong Jun 2022

Effect Of Nano-Metakaolin On Durability Performance Of Concrete, Peng Chong

Journal of China & Foreign Highway

By incorporating nano-metakaolin under different substitution amounts into concrete, the effects on the mechanical strength, fracture characteristics, carbonation performance, fatigue performance, and other durability properties of concrete after corrosion were studied, and the following conclusions were obtained: Nano-metakaolin can significantly enhance the resistance of concrete to acid rain corrosion, reduce the rate and loss rate of mechanical strength loss, as well as the loss rate of fracture toughness and fracture energy. After 80 corrosion cycles, the loss rate of compressive strength of the modified concrete is reduced by approximately 15% compared to the reference group. The loss rate of flexural …

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Study On Technology Of Toughening And Toughening Of Epoxy Resin Asphalt Mixture With Polyester Fiber, Gu Xiaoyan, Gao Jianfei, Li Huixiang Jun 2022

Study On Technology Of Toughening And Toughening Of Epoxy Resin Asphalt Mixture With Polyester Fiber, Gu Xiaoyan, Gao Jianfei, Li Huixiang

Journal of China & Foreign Highway

In order to solve the problem that the deformation of epoxy asphalt concrete with steel bridge deck is inconsistent with that of the bridge deck, which leads to the early crack of epoxy asphalt concrete, the improvement effect of polyester fiber on the flexibility and toughness of epoxy asphalt concrete was evaluated by adding polyester fiber to epoxy asphalt concrete via using low temperature bending test and fatigue test method. The results show that polyester fiber exists in the asphalt by adsorption with the light components of asphalt, reinforcement inside the three-dimensional network, limiting, etc. At the same time, it …

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Study On Solid Content Measurement Of Liquid Accelerator Based On Refractometer Method, Feng Yuee, Wei Yongfeng Jun 2022

Study On Solid Content Measurement Of Liquid Accelerator Based On Refractometer Method, Feng Yuee, Wei Yongfeng

Journal of China & Foreign Highway

In order to solve the problems of long time and poor accuracy in the determination of the solid content of accelerant, this paper proposed to use refractometer concentration testing technology to quickly determine the solid content of liquid accelerant. In addition, in order to study the accuracy of the determination method, accelerator samples with standard solid content, different solid contents, and different types were tested by the drying and weighing method and refractometer method, respectively. The results show that: ① for accelerator of the same standard, the discreteness of the test results by refractometer method is smaller, and the data …

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Research On A New Type Of Prefabricated Bridge Human-Vehicle Isolation Anti-Collision Guardrail, Zhou Jingyu, Tang Junyi, Huang Jingyun Jun 2022

Research On A New Type Of Prefabricated Bridge Human-Vehicle Isolation Anti-Collision Guardrail, Zhou Jingyu, Tang Junyi, Huang Jingyun

Journal of China & Foreign Highway

In recent years, out-of-control motor vehicles often climb the sidewalk steps, break the fence, and fall off the bridge, which has brought a series of heavy losses to people’s lives and property safety. Therefore, it is urgent to take feasible measures to improve the protective performance of bridge collision guardrails, so as to effectively control the risk of such accidents and reduce their consequences. On the basis of summarizing the application characteristics and shortcomings of existing anti-collision measures for bridges, this paper proposed a new type of prefabricated anti-collision guardrail for bridges to achieve separation of pedestrians and vehicles. The …

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Discussion On Design Idea Of Superhighway Cross-Section Composite Interchange, Zhang Jin, Pan Dan Jun 2022

Discussion On Design Idea Of Superhighway Cross-Section Composite Interchange, Zhang Jin, Pan Dan

Journal of China & Foreign Highway

Combined with the example of the Baoxia Hub interworking project design of Yunxi–Baoxia Section of Shiyan via Zhenping–Wuxi Expressway in the mountainous hilly area of western Hubei, this paper introduced the main forms of composite interworking design under the condition of the dislocated intersection of mountainous expressways, discussed the applicable conditions and characteristics of each scheme, and analyzed the advantages and disadvantages of each scheme. The results show that by choosing a reasonable composite interworking form, the normal traffic flow of the intersecting expressway is guaranteed, and the straight heading capacity of the main line under the condition of a …

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Research On Modern Roundabout Applications In China, Zhang Yuan, Liu Hongqi, Chao Sui Jun 2022

Research On Modern Roundabout Applications In China, Zhang Yuan, Liu Hongqi, Chao Sui

Journal of China & Foreign Highway

The modern roundabout is different from the traditional roundabout or traffic ring. Because of its excellent performance in traffic safety, modern roundabouts have been widely used in Europe and the United States. In China, the modern roundabout is still in the stage of concept discussion, lacking practical application and applicability verification. Based on this, this paper built the first modern roundabout in China according to the concept of a modern roundabout and related technical requirements. According to the field observation data, the applicability of the modern roundabout island was evaluated from the perspectives of vehicle speed, loop behavior, truck buffer …

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Research On Crash Test Conditions And Standards Of Isolation Guardrail, Li Chuangmin, Wang Kai, Gan Xinzhong, Liu Qunyan Jun 2022

Research On Crash Test Conditions And Standards Of Isolation Guardrail, Li Chuangmin, Wang Kai, Gan Xinzhong, Liu Qunyan

Journal of China & Foreign Highway

Due to the temporary nature of maintenance operations, the traditional permanent guardrail can not play a role. Therefore, the isolation guardrail is widely used in highway maintenance operations. However, China has not provided safety evaluation criteria for isolation guardrails, leading to a stagnation in research on them. Based on the analysis of the practical application of the isolation guardrail in China’s road maintenance operation, this paper referred to the Manual for Assessing Safety Hardware (MASH) given by the American Association of State Highway and Transportation Officials (AASHTO). Starting from factors such as the vehicle type used in the crash test, …

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Research On Development Of German Road Engineering Standards And Application Management, Fu Yu, Zhang Mouyue Jun 2022

Research On Development Of German Road Engineering Standards And Application Management, Fu Yu, Zhang Mouyue

Journal of China & Foreign Highway

The Federal Ministry of Transport leads the formulation and application of highway engineering standards and relies on the Federal Highway Research Institute (BASt), Highway Society (FGSV), and other research institutions to develop and improve highway engineering design standards and specifications. This paper focused on the status and role of the federal government of Germany and other bodies in the standard management system and expounded the main content, application, and characteristics of the most important highway standards in Germany, so as to provide reference experience for China to promote the understanding and management application of highway standards.

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