At present, the method of calculating the turbulent flow width around the bridge pier is not given in the ＂Standard for Inland River Navigation＂ （GB50139-2004） in China, and the bridge designer usually increases t...At present, the method of calculating the turbulent flow width around the bridge pier is not given in the ＂Standard for Inland River Navigation＂ （GB50139-2004） in China, and the bridge designer usually increases the bridge span in order to ensure the navigation safety, which increases both of the structural design difficulty and the project investments. Therefore, it is extremely essential to give a research on the turbulent flow width around the bridge pier. Through the experiments of the fixed bed and the mobile bed, the factors influencing the turbulent flow width around the bridge pier have been analyzed, such as the approaching flow speed, the water depth, the angles between the bridge pier and the flow direction, the sizes of bridge pier, the shapes of the bridge pier, and the scouting around the bridge pier, etc. Through applying the dimension analytic method to the measured data, the formula of calculating the turbulent flow width around the bridge pier is then inferred.展开更多
The safety limitation of large new-built seagoing ves- sel design and operation is investigated to ensure safety of the new vessels towed through bridge area. We analyze the maneuverabil- ity characteristics of a towi...The safety limitation of large new-built seagoing ves- sel design and operation is investigated to ensure safety of the new vessels towed through bridge area. We analyze the maneuverabil- ity characteristics of a towing fleet, and develop a mathematical drift model of ship motion for the fleet. Based on this drift model and the hydro-meteorological conditions in bridge area, we pro- pose a method to systematically ascertain the safety limitations of water stages, current, wind, speed and visibility. This method is conducive to the safety of both navigation and bridges when large towing fleets transit through bridges.展开更多
Motion state of ship out of control in bridge area was analyzed.Motion procedure after losing control was divided into two steps.One is drift step within stopping period.The other is drift step without inertia,which i...Motion state of ship out of control in bridge area was analyzed.Motion procedure after losing control was divided into two steps.One is drift step within stopping period.The other is drift step without inertia,which is induced by wind and current.Mathematical model for motion of ship out of control,considering wind-induced drift,current-induced drift,stopping ability,etc.,was established.Dangerous collision areas for main pier and auxiliary piers were analyzed according to different calculation conditions.展开更多
This article has discussed the effects on the eastern coastal areas of China brought by the new Eurasian Continental Bridge when it was joined up from Chinese coastal harbour Lianyungang to Rotterdam Harbour in Hollan...This article has discussed the effects on the eastern coastal areas of China brought by the new Eurasian Continental Bridge when it was joined up from Chinese coastal harbour Lianyungang to Rotterdam Harbour in Holland.The effects will be discussed from f展开更多
Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal desi...Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal design scheme of bridge structure is discussed from the aspects of safety, economy and so on in this paper.展开更多
With the promotion of the development strategy of "Chengdu-Chongqing Shuangcheng Economic Circle", the construction of transportation infrastructure in the western mountainous areas is in full swing. With th...With the promotion of the development strategy of "Chengdu-Chongqing Shuangcheng Economic Circle", the construction of transportation infrastructure in the western mountainous areas is in full swing. With the implementation of the new production safety law, the safety management of high-pier and long-span bridges in mountainous areas should not be underestimated. Based on the cantilever casting construction of hanging basket of three continuous rigid frame bridges of B3 mark of Chengkai Expressway, this paper briefly introduces the design points of hanging basket bottom protection platform. Through calculation, the mechanical properties of hanging basket and bottom structure meet the requirements. The successful application of the protective structure can provide reference for the future high-altitude protection of similar projects.展开更多
This article discusses the design strategy of complex mountain highway bridges.During the research phase,details were obtained based on prior literature review and analysis of engineering materials from mountainous ar...This article discusses the design strategy of complex mountain highway bridges.During the research phase,details were obtained based on prior literature review and analysis of engineering materials from mountainous area bridges.After analyzing the design characteristics of complex mountainous area road and bridge projects,the principles for the design of bridges on complex mountainous area expressways were proposed.The research on bridge design was carried out from five dimensions:bridge type selection,foundation design,superstructure design,connection part design,and material and technological innovation.Eventually,a relatively complete design system was formed.It is expected that this paper can provide technical references and value for road and bridge projects in China and promote the sustainable development of China’s road traffic system from a macro perspective.展开更多
The opening of the Hong Kong-Zhuhai-Macao Bridge and the Guangzhou-Shenzhen-Hong Kong Highspeed Railway improved the connectivity of the Guangdong-Hong Kong-Macao Greater Bay Area by shortening the driving time betwee...The opening of the Hong Kong-Zhuhai-Macao Bridge and the Guangzhou-Shenzhen-Hong Kong Highspeed Railway improved the connectivity of the Guangdong-Hong Kong-Macao Greater Bay Area by shortening the driving time between the three areas within one hour,and injected new momentum into regional economic development.As a central city of Guangdong-Hong Kong-Macao Greater Bay Area,Hong Kong has established closer connections with the mainland through the Hong Kong-Zhuhai-Macao Bridge and high-speed railway,and unlocked new potential for the implementation of the Belt and Road Initiative.Under the current international environment of competitiveness,to build a world-level Bay Area with great vigor and vitality requires the fostering of a positive environment for talent both in China and abroad,in which their ingenuity and expertise flow freely.展开更多
Background: The guild concept is useful for understanding the community structure in a land-bridge island system,but most fragmentation studies have focused only on the importance of island area and isolation, other i...Background: The guild concept is useful for understanding the community structure in a land-bridge island system,but most fragmentation studies have focused only on the importance of island area and isolation, other island attributes such as perimeter-area ratio(PAR) were overlooked or understudied.Methods: We have adopted a guild approach to investigate the impacts of island attributes on bird guild richness on a set of 41 recently isolated land-bridge islands in the Thousand Island Lake(TIL), China.Results: We found insectivores had the largest number of species(34 species), fol owed by understory foraging guilds(28 species), omnivores(27 species) and canopy guilds(25 species). Furthermore, our data showed that migrants and residents responded equal y to island area, insectivores and understory guilds were sensitive to island area but omnivores and canopy guilds were not very sensitive. Most guild richness was determined by island area, except for omnivores and canopy guilds.Conclusions: Although PAR or habitat diversity found to be important for bird species richness, our results highlight the importance of island area in maintaining bird diversity in fragmented island systems.展开更多
Since the new Eurasia ContinentalBridge was formally opened in 1992,the East Bridge Tower-- Lianyungang-- has been attracting more and more attentionin the circles of transport and trade worldwide.In 1995, Lianyungang...Since the new Eurasia ContinentalBridge was formally opened in 1992,the East Bridge Tower-- Lianyungang-- has been attracting more and more attentionin the circles of transport and trade worldwide.In 1995, Lianyungang successfully organizedwhole line transport by rail for internationaltransit containers, and freight volume on theContinental Bridge is growing at an acceleratedspeed. At present, Lianyungang hasundertaken the task of transport for the totaltransit containers along the new EurasiaContinental Bridge. The countries and regionsthat make use of the Continental Bridge toconduct transport include the USA, SouthKorea, Japan, Kazakhstan and Hongkong.Between 1992 and 1995, a total of 8。展开更多
The new Eurasia Continental Bridgeruns from East China to Central andWest China, crossing 11 provincesand regions, namely Jiangsu, Shandong,Hubei, Anhui, Shaanxi, Gansu, Shanxi,Sichuan, Qinghai, Xinjiang and Ningxia.T...The new Eurasia Continental Bridgeruns from East China to Central andWest China, crossing 11 provincesand regions, namely Jiangsu, Shandong,Hubei, Anhui, Shaanxi, Gansu, Shanxi,Sichuan, Qinghai, Xinjiang and Ningxia.The total area is 3.6 million sq km and thepopulation is about 300 million, accountingfor a third and a quarter of the whole countryrespectively. The area is very rich in naturalresources, so it is called an "Economic goldbelt" and "Gold corridor". Aerial remote-control survey indicates that along thecontinental bridge from Lianyungang to theAla Mountains within China’s boundary,展开更多
基金Supported by the West Waterway Transportation Construction Foundation under Grant No.2004-328-000-40.
文摘At present, the method of calculating the turbulent flow width around the bridge pier is not given in the ＂Standard for Inland River Navigation＂ （GB50139-2004） in China, and the bridge designer usually increases the bridge span in order to ensure the navigation safety, which increases both of the structural design difficulty and the project investments. Therefore, it is extremely essential to give a research on the turbulent flow width around the bridge pier. Through the experiments of the fixed bed and the mobile bed, the factors influencing the turbulent flow width around the bridge pier have been analyzed, such as the approaching flow speed, the water depth, the angles between the bridge pier and the flow direction, the sizes of bridge pier, the shapes of the bridge pier, and the scouting around the bridge pier, etc. Through applying the dimension analytic method to the measured data, the formula of calculating the turbulent flow width around the bridge pier is then inferred.
基金Supported by the Key Projects of Golden Waterway Transit Capacity Improving Technologies(201132822430)
文摘The safety limitation of large new-built seagoing ves- sel design and operation is investigated to ensure safety of the new vessels towed through bridge area. We analyze the maneuverabil- ity characteristics of a towing fleet, and develop a mathematical drift model of ship motion for the fleet. Based on this drift model and the hydro-meteorological conditions in bridge area, we pro- pose a method to systematically ascertain the safety limitations of water stages, current, wind, speed and visibility. This method is conducive to the safety of both navigation and bridges when large towing fleets transit through bridges.
基金Supported by Disaster Reduction Foundation of Large Complex Project for Sutong Bridge(No.2006BAG04B06)
文摘Motion state of ship out of control in bridge area was analyzed.Motion procedure after losing control was divided into two steps.One is drift step within stopping period.The other is drift step without inertia,which is induced by wind and current.Mathematical model for motion of ship out of control,considering wind-induced drift,current-induced drift,stopping ability,etc.,was established.Dangerous collision areas for main pier and auxiliary piers were analyzed according to different calculation conditions.
文摘This article has discussed the effects on the eastern coastal areas of China brought by the new Eurasian Continental Bridge when it was joined up from Chinese coastal harbour Lianyungang to Rotterdam Harbour in Holland.The effects will be discussed from f
文摘Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal design scheme of bridge structure is discussed from the aspects of safety, economy and so on in this paper.
文摘With the promotion of the development strategy of "Chengdu-Chongqing Shuangcheng Economic Circle", the construction of transportation infrastructure in the western mountainous areas is in full swing. With the implementation of the new production safety law, the safety management of high-pier and long-span bridges in mountainous areas should not be underestimated. Based on the cantilever casting construction of hanging basket of three continuous rigid frame bridges of B3 mark of Chengkai Expressway, this paper briefly introduces the design points of hanging basket bottom protection platform. Through calculation, the mechanical properties of hanging basket and bottom structure meet the requirements. The successful application of the protective structure can provide reference for the future high-altitude protection of similar projects.
文摘This article discusses the design strategy of complex mountain highway bridges.During the research phase,details were obtained based on prior literature review and analysis of engineering materials from mountainous area bridges.After analyzing the design characteristics of complex mountainous area road and bridge projects,the principles for the design of bridges on complex mountainous area expressways were proposed.The research on bridge design was carried out from five dimensions:bridge type selection,foundation design,superstructure design,connection part design,and material and technological innovation.Eventually,a relatively complete design system was formed.It is expected that this paper can provide technical references and value for road and bridge projects in China and promote the sustainable development of China’s road traffic system from a macro perspective.
文摘The opening of the Hong Kong-Zhuhai-Macao Bridge and the Guangzhou-Shenzhen-Hong Kong Highspeed Railway improved the connectivity of the Guangdong-Hong Kong-Macao Greater Bay Area by shortening the driving time between the three areas within one hour,and injected new momentum into regional economic development.As a central city of Guangdong-Hong Kong-Macao Greater Bay Area,Hong Kong has established closer connections with the mainland through the Hong Kong-Zhuhai-Macao Bridge and high-speed railway,and unlocked new potential for the implementation of the Belt and Road Initiative.Under the current international environment of competitiveness,to build a world-level Bay Area with great vigor and vitality requires the fostering of a positive environment for talent both in China and abroad,in which their ingenuity and expertise flow freely.
基金supported by the National Natural Science Foundation of China (No. 31170397)the Fundamental Research Funds for the Central Universities
文摘Background: The guild concept is useful for understanding the community structure in a land-bridge island system,but most fragmentation studies have focused only on the importance of island area and isolation, other island attributes such as perimeter-area ratio(PAR) were overlooked or understudied.Methods: We have adopted a guild approach to investigate the impacts of island attributes on bird guild richness on a set of 41 recently isolated land-bridge islands in the Thousand Island Lake(TIL), China.Results: We found insectivores had the largest number of species(34 species), fol owed by understory foraging guilds(28 species), omnivores(27 species) and canopy guilds(25 species). Furthermore, our data showed that migrants and residents responded equal y to island area, insectivores and understory guilds were sensitive to island area but omnivores and canopy guilds were not very sensitive. Most guild richness was determined by island area, except for omnivores and canopy guilds.Conclusions: Although PAR or habitat diversity found to be important for bird species richness, our results highlight the importance of island area in maintaining bird diversity in fragmented island systems.
文摘Since the new Eurasia ContinentalBridge was formally opened in 1992,the East Bridge Tower-- Lianyungang-- has been attracting more and more attentionin the circles of transport and trade worldwide.In 1995, Lianyungang successfully organizedwhole line transport by rail for internationaltransit containers, and freight volume on theContinental Bridge is growing at an acceleratedspeed. At present, Lianyungang hasundertaken the task of transport for the totaltransit containers along the new EurasiaContinental Bridge. The countries and regionsthat make use of the Continental Bridge toconduct transport include the USA, SouthKorea, Japan, Kazakhstan and Hongkong.Between 1992 and 1995, a total of 8。
文摘The new Eurasia Continental Bridgeruns from East China to Central andWest China, crossing 11 provincesand regions, namely Jiangsu, Shandong,Hubei, Anhui, Shaanxi, Gansu, Shanxi,Sichuan, Qinghai, Xinjiang and Ningxia.The total area is 3.6 million sq km and thepopulation is about 300 million, accountingfor a third and a quarter of the whole countryrespectively. The area is very rich in naturalresources, so it is called an "Economic goldbelt" and "Gold corridor". Aerial remote-control survey indicates that along thecontinental bridge from Lianyungang to theAla Mountains within China’s boundary,
