Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654649
Jiachen Ma, B. Yan
In order to improve the mechanical properties of concrete, silica fume, an active admixture, was selected to replace cement and the effect of silica fume on the mechanical properties of cement paste and concrete was investigated. The mechanism of the peritectic effect of silica fume on concrete was investigated by SEM and XRD. The results showed that the incorporation of silica fume did not improve the mechanical properties of cement paste significantly. The 28d compressive strength of cement concrete based on interfacial modification was improved to a greater extent. When the amount of silica fume was 10%, the compressive strength of cement concrete based on interface modification was increased by 26.4 % compared with that of unmodified concrete. Comparing the SEM images of concrete before and after the interface modification, silica fume improved the structure and density of concrete interface, as well as the arrangement of hydration products CH at the interface. The silica fume has the characteristics of filling effect and pozzolanic reaction with CH. As the amount of silica fume increases, the CH content decreases and the C3S and SiO2 increase. By using the physical and chemical interaction between silica fume and hydration products, the effect of concrete interface modification can be achieved.
{"title":"Study on the mechanical properties and mechanism of cement concrete based on interface modification","authors":"Jiachen Ma, B. Yan","doi":"10.1109/ISTTCA53489.2021.9654649","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654649","url":null,"abstract":"In order to improve the mechanical properties of concrete, silica fume, an active admixture, was selected to replace cement and the effect of silica fume on the mechanical properties of cement paste and concrete was investigated. The mechanism of the peritectic effect of silica fume on concrete was investigated by SEM and XRD. The results showed that the incorporation of silica fume did not improve the mechanical properties of cement paste significantly. The 28d compressive strength of cement concrete based on interfacial modification was improved to a greater extent. When the amount of silica fume was 10%, the compressive strength of cement concrete based on interface modification was increased by 26.4 % compared with that of unmodified concrete. Comparing the SEM images of concrete before and after the interface modification, silica fume improved the structure and density of concrete interface, as well as the arrangement of hydration products CH at the interface. The silica fume has the characteristics of filling effect and pozzolanic reaction with CH. As the amount of silica fume increases, the CH content decreases and the C3S and SiO2 increase. By using the physical and chemical interaction between silica fume and hydration products, the effect of concrete interface modification can be achieved.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123004991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654456
Xingyu Zhang, L. Guo, Weiwei Meng
As one of the most critical functions of traffic information infrastructure, traffic information perception could provide essential data and decision-making support for traffic application scenarios such as traffic situation prediction and signal control. Currently, the common traffic information perception means mainly include geomagnetic coil, radar, video, infrared, etc., but these single traffic information perception devices generally lack of comprehensive information perception and high accuracy. In this paper, the traffic information perception technology based on the radar and video fusion is investigated, which organically integrates the detection data of millimeter wave radar and visual sensors. A large-scale, accurate and comprehensive traffic information perception is realized with the purpose of establishing the foundation for the development of intelligent and informative traffic.
{"title":"Research On Traffic Information Perception Technology Based On Radar And Video Fusion","authors":"Xingyu Zhang, L. Guo, Weiwei Meng","doi":"10.1109/ISTTCA53489.2021.9654456","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654456","url":null,"abstract":"As one of the most critical functions of traffic information infrastructure, traffic information perception could provide essential data and decision-making support for traffic application scenarios such as traffic situation prediction and signal control. Currently, the common traffic information perception means mainly include geomagnetic coil, radar, video, infrared, etc., but these single traffic information perception devices generally lack of comprehensive information perception and high accuracy. In this paper, the traffic information perception technology based on the radar and video fusion is investigated, which organically integrates the detection data of millimeter wave radar and visual sensors. A large-scale, accurate and comprehensive traffic information perception is realized with the purpose of establishing the foundation for the development of intelligent and informative traffic.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131150097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654455
Huiyuan Li, Dehu Cheng, A. Liu, Kang Jiao, Tiejun Cui, Xinliang Dong, W. Nie, Mingpeng Li
As an important structure in water transfer projects, aqueduct must be regularly tested to identify promptly and solve any potential defect such as cracks. However, there is no proper means to detect aqueducts crossing rivers. In this paper, a possible technical solution for UAV autonomous navigation flight was proposed for detections under aqueducts. For horizontal positioning, the UWB-based positioning technology was used to ensure the UAV positioning when the GPS signals were blocked; the smooth processing was employed in the sensor fusion between the GPS and UWB for seamless switchover between these two modes. For vertical positioning, the fusion of an millimeter wave (MMW) radar, a barometer, and an accelerometer improved the elevation measurement and control accuracy of the UAV, ensuring the auto focusing and clear imaging of the long-focal-length camera. The positioning tests under the aqueduct revealed that, the UAV had better accuracy than 30 cm in horizontal direction and above 10 cm in vertical direction.
{"title":"Research on Detection Technologies Under Large Water Conveyance Aqueduct Based on UAV Positioning Navigation","authors":"Huiyuan Li, Dehu Cheng, A. Liu, Kang Jiao, Tiejun Cui, Xinliang Dong, W. Nie, Mingpeng Li","doi":"10.1109/ISTTCA53489.2021.9654455","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654455","url":null,"abstract":"As an important structure in water transfer projects, aqueduct must be regularly tested to identify promptly and solve any potential defect such as cracks. However, there is no proper means to detect aqueducts crossing rivers. In this paper, a possible technical solution for UAV autonomous navigation flight was proposed for detections under aqueducts. For horizontal positioning, the UWB-based positioning technology was used to ensure the UAV positioning when the GPS signals were blocked; the smooth processing was employed in the sensor fusion between the GPS and UWB for seamless switchover between these two modes. For vertical positioning, the fusion of an millimeter wave (MMW) radar, a barometer, and an accelerometer improved the elevation measurement and control accuracy of the UAV, ensuring the auto focusing and clear imaging of the long-focal-length camera. The positioning tests under the aqueduct revealed that, the UAV had better accuracy than 30 cm in horizontal direction and above 10 cm in vertical direction.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128088132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654486
Li Liu, Yang Yang, C. Guo
The finite element model of seismic performance of concrete-filled steel tube (CFST) column with bolted connection is firstly established in this paper, and the accuracy of the model is verified. Furthermore, the numerical simulation of bolt-connected precast assembled CFST column with inner steel tube is carried out based on the finite element model. Finally, the influence mechanism of bolt number and flange thickness on the seismic performance of precast assembled CFST column with inner steel tube is studied according to the result of finite element analysis. The research can provide theoretical support for the optimal design of CFST.
{"title":"The influence of connectors on the seismic performance of precast assembled CFST columns","authors":"Li Liu, Yang Yang, C. Guo","doi":"10.1109/ISTTCA53489.2021.9654486","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654486","url":null,"abstract":"The finite element model of seismic performance of concrete-filled steel tube (CFST) column with bolted connection is firstly established in this paper, and the accuracy of the model is verified. Furthermore, the numerical simulation of bolt-connected precast assembled CFST column with inner steel tube is carried out based on the finite element model. Finally, the influence mechanism of bolt number and flange thickness on the seismic performance of precast assembled CFST column with inner steel tube is studied according to the result of finite element analysis. The research can provide theoretical support for the optimal design of CFST.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117174902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654585
Rongqiang Du, X. Zhu, Ziming Li
There is mutual wind interference between buildings of the complex building group. For different building shapes and layout modes, the quantification of interference between buildings requires specific analysis. Based on computational fluid dynamics and the Realizable κ-ε model, this paper studies the effects of a single cross-shaped super-high-rise building and a proposed building group of four same-sized buildings at different distances and different wind directions, and obtains the wind pressure, average shape coefficient, equivalent static wind loads base bending moment, interference factor and interference variation range of base wind effect of each building group. The results show that the wind pressure on the surface of each building and the base wind parameters between buildings are more significantly affected by the wind direction than the building spacing. The effect of the building equivalent base wind is affected by the wind interference effect. It provides reference for wind resistance design of high-rise buildings with complex section.
{"title":"Study on Wind Loads Interference Effects of the Cross-Shaped Super-High-Rise Buildings","authors":"Rongqiang Du, X. Zhu, Ziming Li","doi":"10.1109/ISTTCA53489.2021.9654585","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654585","url":null,"abstract":"There is mutual wind interference between buildings of the complex building group. For different building shapes and layout modes, the quantification of interference between buildings requires specific analysis. Based on computational fluid dynamics and the Realizable κ-ε model, this paper studies the effects of a single cross-shaped super-high-rise building and a proposed building group of four same-sized buildings at different distances and different wind directions, and obtains the wind pressure, average shape coefficient, equivalent static wind loads base bending moment, interference factor and interference variation range of base wind effect of each building group. The results show that the wind pressure on the surface of each building and the base wind parameters between buildings are more significantly affected by the wind direction than the building spacing. The effect of the building equivalent base wind is affected by the wind interference effect. It provides reference for wind resistance design of high-rise buildings with complex section.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123347677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654528
Pingming Huang, Chen Wang
In combination with the construction of a large-volume concrete of a 630m^3 pile cap of a bridge, according to the heat transfer equation of the concrete hydration heat process, the finite element analysis software Midas/FEA is used to establish a three-dimensional solid finite element model of the 1/4 cap. The temperature field and stress field are simulated, and the results are in good agreement with the on-site temperature monitoring results. The effect of different lengths of water flow on the hydration heat process of large-volume concrete pile caps under the condition of pipe cooling is studied. The results show that the time to reach the peak temperature of the concrete inside it is greatly shortened when the pipe cooling is taken into account. When the water flow time is 5 days, the maximum temperature difference between the surface and the inside is 22.76°C. After 360h, the internal center point temperature of the cap is 34.56°C, which meets the requirements of the specification. Analyzing the reasons for the deviation between the actual measured temperature and the theoretical temperature inside the concrete has certain reference significance for the construction of mass concrete in the future.
{"title":"Research on the influence of different water-passing time on the cooling of mass concrete in the case of pipe cooling","authors":"Pingming Huang, Chen Wang","doi":"10.1109/ISTTCA53489.2021.9654528","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654528","url":null,"abstract":"In combination with the construction of a large-volume concrete of a 630m^3 pile cap of a bridge, according to the heat transfer equation of the concrete hydration heat process, the finite element analysis software Midas/FEA is used to establish a three-dimensional solid finite element model of the 1/4 cap. The temperature field and stress field are simulated, and the results are in good agreement with the on-site temperature monitoring results. The effect of different lengths of water flow on the hydration heat process of large-volume concrete pile caps under the condition of pipe cooling is studied. The results show that the time to reach the peak temperature of the concrete inside it is greatly shortened when the pipe cooling is taken into account. When the water flow time is 5 days, the maximum temperature difference between the surface and the inside is 22.76°C. After 360h, the internal center point temperature of the cap is 34.56°C, which meets the requirements of the specification. Analyzing the reasons for the deviation between the actual measured temperature and the theoretical temperature inside the concrete has certain reference significance for the construction of mass concrete in the future.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"397 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123370939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Coral sand is the main filling material for artificial island offshore, which is generally a wide-graded soil composed of sand particle and gravel particle. It has the characteristics of irregular edges and corners, high compressibility, rich internal and external pores, and easy breakage. Based on historical seismic damage data investigation, the peak seismic acceleration of coral reef sand liquefaction surface rang 0.1g~0.4g. Therefore, anti-liquefaction treatment should be considered for coral reef sand site located in strong earthquake zone. Based on the Timor-Leste Tibar Port Project, a comparative analysis of the influence of densification of vibro-flotation against coral sand liquefaction when applying different quality control measures and design spacing. The obtained result is as follow: for the loosely dredged coral reef sand layer with high fine particle content, when adopt the 3.5m spacing for treatment, adding re-penetration process and increasing the vibration time during compaction stage would increase the degree of compaction significantly, whereas the effect of further reducing the spacing is limited. For clean medium-dense filled coral reef sands, when the 3.5m vibro-impact spacing is adopted, adding re-penetration process and decreasing the spacing during the compaction stage, the compactness can be greatly improved. For the surface filled coral reef sand, the compaction effect is normally poor after vibro compaction, and additional strengthening measures should be taken, such as watering to increase the water table of surface layer before vibration, rolling compaction after vibration, etc.
{"title":"Research on the Densification of Vibroflotation against Liquefaction for Filling Coral Sand","authors":"Xiaocong Liang, Ping Chen, Jing Wang, Q. Qiu, Xiong Xu","doi":"10.1109/ISTTCA53489.2021.9654517","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654517","url":null,"abstract":"Coral sand is the main filling material for artificial island offshore, which is generally a wide-graded soil composed of sand particle and gravel particle. It has the characteristics of irregular edges and corners, high compressibility, rich internal and external pores, and easy breakage. Based on historical seismic damage data investigation, the peak seismic acceleration of coral reef sand liquefaction surface rang 0.1g~0.4g. Therefore, anti-liquefaction treatment should be considered for coral reef sand site located in strong earthquake zone. Based on the Timor-Leste Tibar Port Project, a comparative analysis of the influence of densification of vibro-flotation against coral sand liquefaction when applying different quality control measures and design spacing. The obtained result is as follow: for the loosely dredged coral reef sand layer with high fine particle content, when adopt the 3.5m spacing for treatment, adding re-penetration process and increasing the vibration time during compaction stage would increase the degree of compaction significantly, whereas the effect of further reducing the spacing is limited. For clean medium-dense filled coral reef sands, when the 3.5m vibro-impact spacing is adopted, adding re-penetration process and decreasing the spacing during the compaction stage, the compactness can be greatly improved. For the surface filled coral reef sand, the compaction effect is normally poor after vibro compaction, and additional strengthening measures should be taken, such as watering to increase the water table of surface layer before vibration, rolling compaction after vibration, etc.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124674029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654774
Delin Meng, Qiyue Zhang
With the rapid development of education of our country and the gradual acceleration of urbanization, the construction of large-scale new campus has become an effective model driven by the multiple factors of higher education system reform and university enrollment expansion. With the expanding of the campus space, students need large differences in living space and campus planning space, and that lead to the campus walking distance too far between each function, problems such as traffic flow line is too long, the lack of communication activities. This paper introduces the concept of accessibility, mainly considering the influence of campus bus on student travel in the campus transportation system when students choose two modes of transportation: walking or taking campus bus. Taking the gravity model as the accessibility evaluation model and evaluates the accessibility of the bus network of Jiangsu University. According to the evaluation results, the traffic districts with high traffic demand but low accessibility were found, and the bus line network was optimized to improve the accessibility of each district to meet the traffic demand of the district. Finally, the campus bus network with perfect operation system and equal accessibility to all important nodes is obtained. The new bus network balances the travel demands of different areas on campus, improves the bus operation efficiency of Jiangsu University and reduces the travel time of teachers and students on campus.
{"title":"An Optimization Model of Bus Network of Jiangsu University Based on Accessibility","authors":"Delin Meng, Qiyue Zhang","doi":"10.1109/ISTTCA53489.2021.9654774","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654774","url":null,"abstract":"With the rapid development of education of our country and the gradual acceleration of urbanization, the construction of large-scale new campus has become an effective model driven by the multiple factors of higher education system reform and university enrollment expansion. With the expanding of the campus space, students need large differences in living space and campus planning space, and that lead to the campus walking distance too far between each function, problems such as traffic flow line is too long, the lack of communication activities. This paper introduces the concept of accessibility, mainly considering the influence of campus bus on student travel in the campus transportation system when students choose two modes of transportation: walking or taking campus bus. Taking the gravity model as the accessibility evaluation model and evaluates the accessibility of the bus network of Jiangsu University. According to the evaluation results, the traffic districts with high traffic demand but low accessibility were found, and the bus line network was optimized to improve the accessibility of each district to meet the traffic demand of the district. Finally, the campus bus network with perfect operation system and equal accessibility to all important nodes is obtained. The new bus network balances the travel demands of different areas on campus, improves the bus operation efficiency of Jiangsu University and reduces the travel time of teachers and students on campus.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"499 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131479583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-12DOI: 10.1109/ISTTCA53489.2021.9654757
Xuewei Zhang, Fuwen Su, Zhe Wang, Fei Gao
Out of the normalization of the epidemic, urban bus epidemic management system is a safety monitoring system that focuses on the detection of large-scale public health safety in public transport, which is assembled in both vehicle and cloud. Compared with the previous mainstream stand-alone epidemic surveillance system, three kinds of detection including mask, face and temperature can be done in the vehicle before the face information is uploaded to the cloud to be processed and extracted for digital facial features, which can be reserved with the trip record and health identification of designated individuals, providing an effective deep search that can quickly screen the persons who have a risk of contact with the designated individuals and give feedback to the car. The cloud platform is linked with the command center, indicating that the vehicle terminal will give an alarm as soon as a risk person gets on board while the cloud will also send details to the command center. This system adopts the architecture of edge computing and cloud collaboration, innovatively proposing the edge cloud monitoring structure, which has high precision and speed under normal flow and meets the demand of massive detection in public transport during the epidemic. The vehicle terminal centralizes the computation on edge extended, allowing for faster response of web service even with numerous functions without compromising the epidemic surveillance. In addition, a large amount of redundant computing power saved by edge computing can assist the secondary treatment and judgment of recognition results, and a data visualization platform can be built for comprehensive management.
{"title":"Bus Epidemic Monitoring System Based on K210","authors":"Xuewei Zhang, Fuwen Su, Zhe Wang, Fei Gao","doi":"10.1109/ISTTCA53489.2021.9654757","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654757","url":null,"abstract":"Out of the normalization of the epidemic, urban bus epidemic management system is a safety monitoring system that focuses on the detection of large-scale public health safety in public transport, which is assembled in both vehicle and cloud. Compared with the previous mainstream stand-alone epidemic surveillance system, three kinds of detection including mask, face and temperature can be done in the vehicle before the face information is uploaded to the cloud to be processed and extracted for digital facial features, which can be reserved with the trip record and health identification of designated individuals, providing an effective deep search that can quickly screen the persons who have a risk of contact with the designated individuals and give feedback to the car. The cloud platform is linked with the command center, indicating that the vehicle terminal will give an alarm as soon as a risk person gets on board while the cloud will also send details to the command center. This system adopts the architecture of edge computing and cloud collaboration, innovatively proposing the edge cloud monitoring structure, which has high precision and speed under normal flow and meets the demand of massive detection in public transport during the epidemic. The vehicle terminal centralizes the computation on edge extended, allowing for faster response of web service even with numerous functions without compromising the epidemic surveillance. In addition, a large amount of redundant computing power saved by edge computing can assist the secondary treatment and judgment of recognition results, and a data visualization platform can be built for comprehensive management.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132764810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There are more studies on self-compacting concrete but less on self-compacting prestressed concrete members using mechanism sand. In this paper, the stiffness and deformation performance of the test members are investigated by observing the mid-span deflection and concrete strains in different cross-sections during and after the tensioning process of 19.2-m mechanism sand self-compacting prestressed concrete beams. The test observation results are processed, and the member deflection is calculated according to the Code JTG D62-2004. Then the deflection is calculated by regressing the curvature curve of the secondary beam section through the concrete strain observations of different sections. Then the finite element model simulation is carried out to calculate the mid-span invert arch value after the tensioning process. The results are in good agreement with the actual test. Finally, the four results were compared according to the actual measured deflection values of the test. Finally, it is concluded that there are some differences between the short-term deflection calculation of the mechanism and self-compacting prestressed members using the "JTG D62-2004" and the measured results, but still can meet the design requirements the mechanism sand self-compacting prestressed members.
{"title":"Study on the Stiffness and Deformation Performance of Self-Compacting Concrete Prestressed Beams with Mechanized Sand","authors":"Yankun Zhang, Zhuoran Zhang, Shiqin He, Dongya Qian","doi":"10.1109/ISTTCA53489.2021.9654523","DOIUrl":"https://doi.org/10.1109/ISTTCA53489.2021.9654523","url":null,"abstract":"There are more studies on self-compacting concrete but less on self-compacting prestressed concrete members using mechanism sand. In this paper, the stiffness and deformation performance of the test members are investigated by observing the mid-span deflection and concrete strains in different cross-sections during and after the tensioning process of 19.2-m mechanism sand self-compacting prestressed concrete beams. The test observation results are processed, and the member deflection is calculated according to the Code JTG D62-2004. Then the deflection is calculated by regressing the curvature curve of the secondary beam section through the concrete strain observations of different sections. Then the finite element model simulation is carried out to calculate the mid-span invert arch value after the tensioning process. The results are in good agreement with the actual test. Finally, the four results were compared according to the actual measured deflection values of the test. Finally, it is concluded that there are some differences between the short-term deflection calculation of the mechanism and self-compacting prestressed members using the \"JTG D62-2004\" and the measured results, but still can meet the design requirements the mechanism sand self-compacting prestressed members.","PeriodicalId":383266,"journal":{"name":"2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131763507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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