In order to evaluate objectively and accurately the integrity, safety and operating conditions in real time for the Nanjing Yangtze River Bridge, a large structural safety monitoring system was described. The monitori...In order to evaluate objectively and accurately the integrity, safety and operating conditions in real time for the Nanjing Yangtze River Bridge, a large structural safety monitoring system was described. The monitoring system is composed of three parts: sensor system, signal sampling and processing system, and safety monitoring and assessment system. Combining theoretical analysis with measured data analysis, main monitoring contents and layout of measuring points were determined. The vibration response monitoring was significantly investigated. The main contents of safety monitoring on vibration response monitoring are vibration of the main body of the Nanjing Yangtze river bridge, collision avoidance of the bridge piers, vibration of girders on high piers for the bridge approach and earthquake. As a field laboratory, the safety monitorying system also provides information to investigate the unknown and indeterminate problems on bridge structures and specific environment around bridges.展开更多
A series of dynamic behavior tests on Nanjing flake-shaped fine sand were performed by using the WFI cyclic triaxial apparatus made in England. The dynamic behaviors of Nanjing flake-shaped fine sand under different s...A series of dynamic behavior tests on Nanjing flake-shaped fine sand were performed by using the WFI cyclic triaxial apparatus made in England. The dynamic behaviors of Nanjing flake-shaped fine sand under different static deviator stress levels and cyclic stress ratios were studied. Through comparing the effective stress path under cyclic loading with static loading, the processes of liquefaction of saturated Nanjing flake-shaped fine sand with development of dynamic pore-water pressure, including the initial compact state, compression state and dilative state, were investigated. The variation of the shear stiffness with the number of cycles and cyclic strain was investigated by analyzing the secant shear modulus in each unload-reload loop of dynamic stress-strain relationship. And by means of the exponential function, the empirical equations of the relationship between secant shear modulus Gsec, shear modulus ratio Gsec/Gmax and cyclic strain ε were established based on series of test results. The results show that according to different combinations of static deviator stress and cyclic stress, two kinds of failure patterns with deviator stress reversal or no deviator stress reversal are observed in the samples tested in this series, including cyclic mobility and the failure of accumulation residual strain. In addition, the degradation of dynamic shear modulus is due to the development of vibration pore-water pressure and it is observed that the shear modulus reduces with the progressive number of cycles.展开更多
By her strategic postition,Nanjing is number one key city of Jiangsu Province,important key city atlower reaches of Yangtze River,signficant industrial Zone with strategic importance,she is also the would be center of...By her strategic postition,Nanjing is number one key city of Jiangsu Province,important key city atlower reaches of Yangtze River,signficant industrial Zone with strategic importance,she is also the would be center ofinternational cultural exchange. By means of the specific-oriented function,Nanjing possesses four essential factors:manufacture,circulation,service,and innovation.In order to develop the affect of a key city,we have to strengthen the planning and constructionof Nanjing urban ring,upgrade main city＇s comprehensive services,give play of the special affect of connect the East andenlighten the west,carry out the crosswise economical alliance.展开更多
Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large brid...Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large bridges in the world. These two types of railway floor systems of the two bridges have never been used in China before. The problem how to conform the deformations and stress levels of the railway floor system of WTC Bridge was studied. After finite element analysis and comparison,the plan of arranging one expansion stringer every two panels in railway floor system were proposed and good effect was obtained. Because of the application of three trusses,the allocation of the loads acted on the deck in three trusses is different and varies in different places of NDC Bridge. This problem was studied by model experiment and 3D finite element analysis. The results of 3D FEM analysis coincide with the model test results. The allocation rule of the loads acting on the deck in three trusses was presented. Because of the application of monolithic decks,the stiffness and structural integrity of NDC Bridge are high.展开更多
Organised by:Nanjing University,China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent Monitoring in Geoengineering;Suzhou Nan...Organised by:Nanjing University,China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent Monitoring in Geoengineering;Suzhou NanZee Sensing Technology.Introduction:The“International Symposium”series,founded in 1986 and with a history of 36 years,is a signature event for the International society of Environmental Geotechnology(ISEG).ISEG seeks to promote scientific cooperation among countries.展开更多
Nanjing, China 7th–9th December 2022 Organised by:Nanjing University, China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent ...Nanjing, China 7th–9th December 2022 Organised by:Nanjing University, China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent Monitoring in Geoengineering;Suzhou Nan Zee Sensing Technology.展开更多
Hangdling Editor of the Year 2023.Journal of Cotton Research editorial office launches the award of Handling editors of the year to recognize handling editors with the most processed manuscripts in Journal of Cotton R...Hangdling Editor of the Year 2023.Journal of Cotton Research editorial office launches the award of Handling editors of the year to recognize handling editors with the most processed manuscripts in Journal of Cotton Research.Here are the Top 4 Handling editors of 2023:DONG Hezhong,Institute of Industrial Crops,Shandong Academy of Agricultural Sciences,China YANG Guozheng,College of Plant Science&Technology,Huazhong Agricultural University,China ZHANG Lizhen,College of Resources and Environmental Sciences,China Agricultural University,China ZHOU Zhiguo,College of Agriculture,Nanjing Agricultural University,China.展开更多
文摘In order to evaluate objectively and accurately the integrity, safety and operating conditions in real time for the Nanjing Yangtze River Bridge, a large structural safety monitoring system was described. The monitoring system is composed of three parts: sensor system, signal sampling and processing system, and safety monitoring and assessment system. Combining theoretical analysis with measured data analysis, main monitoring contents and layout of measuring points were determined. The vibration response monitoring was significantly investigated. The main contents of safety monitoring on vibration response monitoring are vibration of the main body of the Nanjing Yangtze river bridge, collision avoidance of the bridge piers, vibration of girders on high piers for the bridge approach and earthquake. As a field laboratory, the safety monitorying system also provides information to investigate the unknown and indeterminate problems on bridge structures and specific environment around bridges.
基金Project (2007CB714200) supported by National Basic Research Program of ChinaProject (90715018) supported by Key Research Project of National Natural Science Foundation of China
文摘A series of dynamic behavior tests on Nanjing flake-shaped fine sand were performed by using the WFI cyclic triaxial apparatus made in England. The dynamic behaviors of Nanjing flake-shaped fine sand under different static deviator stress levels and cyclic stress ratios were studied. Through comparing the effective stress path under cyclic loading with static loading, the processes of liquefaction of saturated Nanjing flake-shaped fine sand with development of dynamic pore-water pressure, including the initial compact state, compression state and dilative state, were investigated. The variation of the shear stiffness with the number of cycles and cyclic strain was investigated by analyzing the secant shear modulus in each unload-reload loop of dynamic stress-strain relationship. And by means of the exponential function, the empirical equations of the relationship between secant shear modulus Gsec, shear modulus ratio Gsec/Gmax and cyclic strain ε were established based on series of test results. The results show that according to different combinations of static deviator stress and cyclic stress, two kinds of failure patterns with deviator stress reversal or no deviator stress reversal are observed in the samples tested in this series, including cyclic mobility and the failure of accumulation residual strain. In addition, the degradation of dynamic shear modulus is due to the development of vibration pore-water pressure and it is observed that the shear modulus reduces with the progressive number of cycles.
文摘By her strategic postition,Nanjing is number one key city of Jiangsu Province,important key city atlower reaches of Yangtze River,signficant industrial Zone with strategic importance,she is also the would be center ofinternational cultural exchange. By means of the specific-oriented function,Nanjing possesses four essential factors:manufacture,circulation,service,and innovation.In order to develop the affect of a key city,we have to strengthen the planning and constructionof Nanjing urban ring,upgrade main city＇s comprehensive services,give play of the special affect of connect the East andenlighten the west,carry out the crosswise economical alliance.
基金Projects(2004G028, 2004G016) supported by the Science and Technology Development Program of Railways Department, China
文摘Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large bridges in the world. These two types of railway floor systems of the two bridges have never been used in China before. The problem how to conform the deformations and stress levels of the railway floor system of WTC Bridge was studied. After finite element analysis and comparison,the plan of arranging one expansion stringer every two panels in railway floor system were proposed and good effect was obtained. Because of the application of three trusses,the allocation of the loads acted on the deck in three trusses is different and varies in different places of NDC Bridge. This problem was studied by model experiment and 3D finite element analysis. The results of 3D FEM analysis coincide with the model test results. The allocation rule of the loads acting on the deck in three trusses was presented. Because of the application of monolithic decks,the stiffness and structural integrity of NDC Bridge are high.
文摘Organised by:Nanjing University,China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent Monitoring in Geoengineering;Suzhou NanZee Sensing Technology.Introduction:The“International Symposium”series,founded in 1986 and with a history of 36 years,is a signature event for the International society of Environmental Geotechnology(ISEG).ISEG seeks to promote scientific cooperation among countries.
文摘Nanjing, China 7th–9th December 2022 Organised by:Nanjing University, China Supported by:National Natural Science Foundation of China;Nanjing University High-Tech Institute at Suzhou;CSRME Subsociety for Intelligent Monitoring in Geoengineering;Suzhou Nan Zee Sensing Technology.
文摘Hangdling Editor of the Year 2023.Journal of Cotton Research editorial office launches the award of Handling editors of the year to recognize handling editors with the most processed manuscripts in Journal of Cotton Research.Here are the Top 4 Handling editors of 2023:DONG Hezhong,Institute of Industrial Crops,Shandong Academy of Agricultural Sciences,China YANG Guozheng,College of Plant Science&Technology,Huazhong Agricultural University,China ZHANG Lizhen,College of Resources and Environmental Sciences,China Agricultural University,China ZHOU Zhiguo,College of Agriculture,Nanjing Agricultural University,China.
