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Based on the large-span spatial structure of Ordos's airport terminal of the extension project, a set of construction process and key technology for large-span spatial steel structure was discussed in detail, including elementary assembly on ground, segmental hoisting, overhead unit connection and curvilinear accumulated sliding. A set of multi-stage construction analysis method was put forward. Through...
In undeveloped rural areas, the construction of wastewater treatment devices was restricted for shortage of investment. This paper begins with a brief introduction to the concept of financing and financing models, as well as the three elements of financing, involving financing main body, financing channels, and financing mode. And then, the popular financing models, especially the project financing...
MODIS satellite products with 1km spatial resolution is utilizesd to retrieve the sea ice area in Liaodong bay and the environmental satellite with 30m spatial resolution is also used to correct the edge of sea ice. Combined with the atmosphere temperature and Sea Surface Temperature (SST) of the numerical simulation product of ECMWF, sea ice variation in Liaodong bay is analyzed. It is shown that...
In order to optimize the steel suspension box, the element calculation model is set up to analyze its mechanical characteristics during construction at first. The results show that the critical conditions of the whole structure maximum stress occurs during casting the first layer cap concrete at high tide level and the overall stress level is low in every construction condition. Then sensitivity degrees...
Based on knowing the layout of the airport bus stops is the most important factor which impact the share rate of airport bus, using the idea of the hierarchical layout method, combining the convenience of interchange with the Metro, this paper re-laid the airport bus stops. After getting the program of the airport bus stops, selecting the appropriate indicators including coverage of the site, the...
This paper select the tap water, 0.01mol/L,0.03mol/L,0.05mol/L,0.07mol/L CaCl2 solution, ionic strength of 0.02mol/L of CaCl2 and KCl mixed solution for the simulated leachate. The permeability test of clay is carried out, and the influence of different types and different concentrations of leachate on the hydraulic properties of compacted clay is analysed under the different vertical pressure. Experimental...
The durability of subsea tunnel faces severe trial under complex service environment. In this paper, the tunnel's medial and lateral sides are analyzed using different models. The medial side is divided into general atmospheric environment and marine atmospheric environment with different models. A carbonation model considering construction defects is established for the former one and another considering...
As the traditional refrigerant damage to the ozone layer, global warming and other environmental problems have become increasingly prominent, CO2 has started to be emphasized again as an ideal refrigerant. The characteristics of CO2 as refrigerants are introduced. The CO2 trans-critical cycle is analyzed and summarized in detail. The methods of improving cycle performance are proposed, which include...
The distributing of the mean and extreme wind pressure is investigated by wind tunnel test, and wind pressure coefficients of the test points are obtained. By using these data, this paper calculates the wind load shape coefficients, the real wind loads and the over-turning moments of every partition on the basis of wind engineering theories. Comparing the results of test and the values of Load Code,...
Both of construction industry's economic growth and environmental impact have recently been social hot-topics, while most researches about the relationship between them are qualitative or simply quantitative. In this paper, construction industry's gross product and CO2 emission are selected to represent its economic growth and environmental impact respectively. Based on the collection of yearly construction...
In order to study how to reduce the creep of prestressed concrete beams, in this paper, four 1∶6 scaled specimens was produced relay on the actual project, and different prestressing program was designed. The new way of the early and the second prestress was compared with traditional way to effect on concrete creep of beams, focus of the study in the creep damage under the action of the tendon, beam...
Many footbridges have natural frequencies that coincide with the dominant frequencies of the pedestrian-induced load and therefore they have a potential to suffer excessive vibrations under dynamic loads induced by pedestrians. The main focus of this paper is on the serviceability assessment of a truss-type footbridge by the dynamic test and numerical analysis. Firstly, the design criteria proposed...
Pedestrian underpass and pedestrian overcrossing belong to pedestrian facility to cross street. It is an important work to evaluate the plan between pedestrian underpass with pedestrian overcrossing, which Many factors should be concerned during the process. Commonly, there are some methods can resolve the problem from different aspects. Under the basic of building the index system about pedestrian...
According to the different simplification methods for different types of legs for jack-up, the main parameters were confirmed in this paper. Moreover, sensibility analysis for the parameters was performed using FEM to give reasonable advice for the determination of the main patameters.
Dilatancy mechanism of anchorage interface is analyzed by using microscopic model, which shows that failure of anchorage interface is of forms of climbing or gnawing and interface is with obvious dilatancy no matter what the failure form is. Analysis of macro-mechanical effect shows that influence of radial deformation of anchorage interface on chemical properties of anchorage interface is not insignificant...
This paper studied the seismic response characteristics and seismic performance of arch concrete bridge. Nonlinear analysis using three-dimensional analytical model was conducted considering 18 modified ground motions. A linear analysis was applied to observe the dynamic response characteristics for the arch bridge after dampers installed. Finally, the damper location effect on the bridge seismic...
In order to study effectively vehicle-bridge interaction, one experimental method is presented in detail based on the scale-model system established through similarity theory in this paper. Firstly, the model materials are selected appropriately according to the characteristics of bridge and vehicle. Besides, the model parameters such as size, modulus and so on are determined according to the similarity...
Through dynamic test system, the speed-dynamic characteristic of a bridge-approach roadbed is studied in field test of a high speed railway, the dynamic stress influence characteristic of seamless track bridge-approach roadbed in line and depth is obtained under train's running speed; at the same time, the conception of speed power coefficient is presented, and the speed power coefficient of bridge-approach...
In order to improve the safety of the Interchange, the paper gets main factors affecting the safety of Interchange through the systemic analysis of overpass ramp, speed lane, landscape subsidiary facilities and overpass structures and other design elements, which is based on the theories of System Engineering, Traffic Engineering, Bridge Engineering and others and on the indicators of consistent speed...
Marine silt formation is a special kind of soil in coastal areas. In recent years, there are more and more deep and large foundations at coastal areas. Currently, The research of marine silt formation deep foundation is very few. In dealing with this situation, grouting is a frequently used measure, grouting also is an effective method to ensure the security or the excavation pit on the surrounding...
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