The microorganism index, physical and chemical property such as the pH value, water content and
organic matter of silt around pier in the typical area of yellow river are determined. These get ready to
research the microorganism corrosion of pier in the silt of the typical area of yellow river and have very
important theoretical significance and realistic meaning for researching systematically the
microorganism corrosion of pier in the silt of the typical area of yellow river.
The cross-sectional shapes of two construction projects for the transient main cables are non-circular
cross-sections during construction of the long-span suspension bridge, so the transient main cables can experience
galloping instabilities. The galloping coefficients of the several representative cases of two construction projects for the
transient main cables without wind-resistant measures for the long-span suspension bridge were investigated for the first
time by means of the CFD method, referring to an erecting suspension bridge. Results show that for the project 1, at the
early stages of the main cables construction, the galloping instabilities can occur, but at the later stages of that, the
galloping instabilities cannot occur. For the project 2, there exists a lot of wind attack angles whose galloping
coefficients are less than 0 at the whole construction stages. From the perspective for galloping instability the project 1
is better 2.Through the analysis and comparison the galloping performance of two kinds of construction projects for the
transient main cables, the advantage and disadvantage for two construction projects is explained theoretically from the
perspective for whether can result in the galloping instability.
With the development of economy and improvement degree of modernization, the villa project design
program tend to focus on the green, high-tech, humanities, and more emphasis on the integrity of space,
noble and elegant feeling. Therefore, based on the study of literatures, this paper discussed the present
situation and issue and features of Glass Fiber Reinforced Concrete and the feature of assembly house,
and confirmed that the villa of assemble house is feasible by built of Glass Fiber Reinforced Concrete.
The aerodynamic interference effects of wind-resistant performance for pylon is one of very important problems in
numerical simulation studies of wind resistant of bridges. On the basis of looking through a great deal of related
literatures at home and abroad, research history, contents, method and achievements of the aerodynamic interference
effects are summarized, and the existing problem for galloping, buffeting and vortex-induced vibration of pylon and
directions for the next research are pointed out.
Microbial corrosion of reinforce concrete structure is a new branch of learning. This branch deals with civil
engineering , environment engineering, biology, chemistry, materials science and so on and is a interdisciplinary
area. Research progress of the causes, research methods and contents of microbial corrosion of reinforced concrete
structure is described. The research in the field is just beginning and concerted effort is needed to go further into the
mechanism of reinforce concrete structure and assess the security and natural life of reinforce concrete structure
under the special condition and put forward the protective methods.
KEYWORDS: Bridges, Finite element methods, Vibration control, Control systems, Analytical research, Systems modeling, Civil engineering, Signal attenuation, Lithium, Visualization
On the basis of static, dynamic and transient analysis for the prestressing cable structures, the parameters to control the
vibration of the system for transient main cables and catwalk of some long-span suspension bridge at the construction
stages with the assistant cables are investigated adopting the method of the finite element considering the geometry
nonlinearity. The review and prospect to control vibration with assistant cables are summarized, the finite element
modeling of the system for transient main cables and catwalk is established, and the influence of the position of the
assistant cables, disposed fashion and the tensile forces upon the critical frequencies of the system for transient main
cables and catwalk is researched. At the same time, the effect of the damp and the tensile forces of the assistant cables on
the equivalent damping ratio of the system for transient main cables and catwalk inside and outside the plane is studied
and the effect to control the vibration of the system is analysed. In the end, the influence of the transformation for the
tensile forces about assistant cables upon those of the transient main cables and catwalk is also investigated. Results
show that, to increase the critical frequencies of the system, the assistant cables should be laid vertically with the main
cables and be located in interim span or between the tower and interim span, and to increase the amount of the assistant
cables can increase the critical frequencies ,and to increase the rigidities of the assistant cables can improve the ones of
the transient main cables but decrease the anti-torsion ability of the catwalks, and to increase the damp of the assistant
cables can improve the vibration of the transient main cables inside and outside the plane but the result is little outside
the plane, and in addition the effect of the rigidities of the assistant cables is larger outside the plane but is little inside
the plane. The results also show that the influence of the change of the tensile forces for the assistant cables upon those
of the transient main cables and catwalk is very little.
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