This article introduces the project overview，construction goal and design philosophy of Hong Kong-Zhuhai-Macao Bridge. Based on large scale，factory production，standardiza-tion and assemble line，the innovative concept is taken as the general principle for design with the emphasis on description of the new material，new technology，new construction method and new equipment used in the design. The application of innovative technology has provided a solid foundation and favorable guarantee for project quality and design service life.
The depth of earth cover for tunnel anti-buoyancy security during construction and operation was analyzed in this paper with theoretical and numerical methods. The principles and theoretical analysis methods were proposed for it. The formula of depth of earth cover for anti-buoyancy security of tunnel during construction was given for the first time. It involves the unfavorable factors， such as uncondensed mortar， the favorable factors， such as resistances of soil and segments. The weight of earth cover for tunnel was suggested to consider as unique factor for tunnel security during operation. The eroded depth for design should be considered for tunnel influenced by floods. It has provided some references for longitudinal section design of the tunnel in construction under the Yangzi River in Nanjing. And it also provided theoretical foundation for the set depth of earth cover for anti-buoyancy security of other shield tunnels under river or sea.
This article takes Xia-Zhang highway (Xiamen section) Dongfu tunnel construction as an example. Introduces the application of ?299 big pipe follow with pipe drilling occlusal and linking reinforcement technology+cross-located right next door after disassembly type excavation technology in shallow-buried rich water soft soil stratum tunnel excavation process. While using TGMIS dynamic intelligent monitoring system of construction settlement conditions for data acquisition， analysis and processing， make the deformation of surrounding rock control， successfully passed the construction of shallow-buried soft soil excavation.
This paper provides a review on the development of structural monitoring in Japan, with an emphasis on the type, strategy, and utilization of monitoring systems. The review focuses on bridge and building structures using vibration-based techniques. Structural monitoring systems in Japan historically started with the objective of evaluating structural responses against extreme events. In the development of structural monitoring, monitoring systems and collected data were used to verify design assumptions, update specifications, and facilitate the efficacy of vibration control systems. Strategies and case studies on monitoring for the design verification of long-span bridges and tall buildings, the performance of seismic isolation systems in building and bridges, the verification of structural retrofit, the verification of structural control systems (passive, semiactive, and active), structural assessment, and damage detection are described. More recently, the application
of monitoring systems has been extended to facilitate efficient operation and effective maintenance through the rationalization of risk and asset management using monitoring data. This paper also summarizes the lessons learned and feedback obtained from case studies on the structural monitoring of bridges and buildings in Japan.
Compared with that of the offshore and inland long-span bridges, the wind field of marine bridges will be more complicated, and their wind resistance safety will inevitably become tougher. This paper first analyzes the status quo of wind-resistance research of long-span bridges, and then focuses on the difficulties and technical problems regarding four aspects: wind field characteristics, wind-resistant design theories, countermeasures for wind-induced vibration, and windbreak technologies for driving safety. Based on these analyses, countermeasures for guaranteeing wind resistance safety of marine bridges are proposed.
To discuss the applicability of carbon fiber reinforced polymer (CFRP) cables and reactive powder concrete (RPC)in super long span cable stayed bridges, taking a 1 008 m cable stayed bridge using steel girder and steel cables as example, a cable stayed bridge with the same span using RPC(reactive powder concrete) as the girder and advanced composite material CFRP (carbon fiber reinforced polymer) as the cable was designed, in which the cable cross section was determined by the principles of equivalent cable strength and the beam cross section was determined considering the stiffness, shear capacity and local stability. Based on the method of finite element analysis, the comparative study of these two structures on their static properties, dynamic properties, stability and wind resistance were carried out. The results show that it is feasible for using RPC as the girder and CFRP as the cable so as to form a highly efficient, durable cable stayed bridge of concrete structure and make its applicable span reach about 1 000 m long.
The middle tower of Taizhou Bridge consists of deepwater caisson foundation and steel tower with herringbone shape along the longitudinal direction. The construction is complex. Based on previous study, using the technology of up-stream and down-stream anchor pier positioning and the system of information real-time monitoring ensures position and implantation. Meanwhile，control measure is used to prevent caisson sinking suddenly and extra-sinking in final stage. Erection accuracy of steel tower is very high, but adjusted segments are few. During the construction, the structure system changes frequently. To the feature, the method of whole process control based on geometric control is used in the project, which analyzed the error of manufacturing segment, linear of pre-assembled segment and erection, and accuracy management system is established uniformly. The final accuracy of erection is better than that designed. Many innovative technologies are obtained in this project, and the key technologies about construction of deepwater caisson , manufacturing and erection of steel tower are formed, which can be referred for other similar projects in the future.
The paper presents the traffic volume and loading of Yangtze River bridges in Jiangsu Province from 2007 to 2010. The results show that traffic volume is increasing along with the time. The traffic volume and loading of truck of Yangtze River Bridge are analyzed by wheel load spectrum. The paper gives the truck wheel load and typical wheel load ratio in Jiangsu Province. The overloading analysis show that overloading is serious in Yangtze River Bridges in Jiangsu Province.The research results is useful to the steel deck pavement design of Taizhou Bridge.
Compared to the tower of common twospan suspension bridges, the middle towers of multispan suspension bridges have several different characteristics, such as the constraints, service conditions and loads, etc, which affect the safety and applicability of the bridges. In this paper, a small-scale model was designed for the middle tower of Taizhou Bridge, based on its actual working conditions. By the finite element method, the similarities between the experiment and the prototype were investigated from three aspects, including the internal forces, displacements and strains. It is demonstrated from the investigation that, with the geometric size and material modulus as the essential parameters, the designed model herein can satisfy the requirements of mechanical properties of experiment.