Advanced Materials Research Vols. 446-449

Abstract: Influence of permeated crystalline waterproof materials on permeability and automation healing of concrete was studied by impermeability test methods for two and a few times. Microstructure of concrete was analyzed and characterized with SEM and MIP. The results showed that permeated crystalline waterproof materials had function of durable self-repairing and impermeability of concrete improved with increasing of permeated crystalline waterproof materials. It was because that reaction crystallization of active component in permeated crystalline materials and Ca(OH)2 in concrete filled interfacial of concrete and cement paste matrix. In addition, pore size distribution of concrete with permeated crystalline waterproof materials was so good that there were more content of less harmful and less content of harmful pore in concrete. Therefore, most probable pore diameter of concrete reduced and impermeability of concrete improved.

Abstract: This document advances a concept of Cooperative grid with prestressed upper and lower chord cables, and points out its characteristics by comparing with different structure forms. Through an example of the Cooperative grid, the analysis is carried out by means of mode–superposition response spectrum method, and the mechanical characteristics of the Cooperative grid under earthquake action are researched.

Abstract: A large number of earthquake disasters indicate that the underground structure, such as metro tunnel, is not safe and reliable as people think, and can also be destroyed and collapsed under dynamic load, e.g. earthquake. Therefore, it is necessary to study the seismic response analysis of underground structure in great detail for underground structure under dynamic loading, especially under the earthquake load. Hence, in view of the soft soil of Hangzhou, the 3D non-linear finite element software ADINA is used to study the seismic response of section tunnel of Hangzhou metro line 1, to summarize the earthquake response characteristics of the subway underground structure, and to provide the calculation results of metro tunnel’s seismic response and the change rule of lining deformation and stress. The conclusions obtained can provide some reference values in the seismic design of metro tunnel in soft soil regions.

Abstract: In order to solve the problem how to treat with nitrogen as well as COD simultaneously and to reached the water emission standards, by leachate, fecal sewage and municipal wastewater, an experiment has been studied through orthogonal experiment with A2/O.In this experiment, the mixture of those three wastewater is used as the influent. As the result shows, HRT (Hydraulic Retention Time) plays the key role in the experiment, and it is a simple and effective way to heighten an effect of the pollutants removal by extending HRT.

Abstract: The current landscape space design ignored the existence of self-awareness and demonstration of Human Beings, meanwhile it also make human beings being dominated constantly. This thesis combined narrative, space, plot and other theories which related with the theory of landscape design explored the design methods which make the landscape views more appealing and space-create strategies which take narrative as spatial clues from the angel of main body in creation and started by aesthetic experience and behaviors of Human Beings, it also reflect harmonious spatial order between Views and Human Beings.

Abstract: Axial compression experiments of four full-scale reinforced concrete columns of two groups were carried out. One group of three columns used high-strength steel with the yield strength of 1000MPa as reinforcement hoops, and the second group used the ordinary-strength steel with yield strength of 400MPa. The axial compressive performances between these two groups were assessed. Compared to the specimen using the ordinary-strength steel, the axial compressive bearing capacity of using the high strength steel dose not increase significantly, while the deformation ability increases greatly. The results also indicate that the stress redistributions of the hoops and the concrete sections are obvious, and long-lasting when specimens achieve the ultimate bearing capacity after the yield of the rebar and local damage of concrete materials, at this time the strain of the specimens developes a lot, especially stress - strain curves of speciments with high-strength hoop all show a wide and flat top.

Abstract: the traditional domestic rammered earth buildings technology use natural soil material without scientific and reasonable soil sample analysis and grading test, and artificial construction, so the rammered earth wall is usually low intensity and poor durability. This article researches the application of soil-rock mixture materials in modern rammered earth buildings with the soil-rock mixture engineering characteristic, the reasonable gradation and process improvement. We want to improve the defects of material selection and construction technology in traditional rammered earth buildings, promote sustainable development of green rammered earth buildings in the future.

Abstract: For the initial lining structure of tunnel , constructing an consider integrated safety factor function.Consider the initial shotcrete tunnel support structure as a series system, using the interval estimation of the "wide boundaries of law" system of tunnel lining structure analysis, on this basis to determine the system failure mode. Using the limit displacement under the condition of axial force and bending moment of the corresponding displacement and construction monitoring of displacement are analyzed, considering the material properties, geometry and random effects. Using the Monte Carlo finite element method, combined with a typical project example to tunnel structural system reliability index were calculated. The calculation results show that in the engineering example, tunnel lining structure in some local section of the reliability index is smaller, but the whole support system reliability indexes meet the design requirements, the whole tunnel lining structure in a safe state.

Abstract: Progress monitoring and control is one of the most important tasks of management project. Basically, construction works produce a lot of information that were required by top managements of construction organizations to track the work progress on site. A recent issue highlighted by top managements is inefficiency in obtaining information from project site on time. Hence, the focus of this research is to establish a computerized information system that can be utilized by top management in order to evaluate the construction progress. The aim of this research is to develop a computerized project progress monitoring entitled Executive Information Site Monitoring System (EISMS). In order to develop EISMS, Classic Waterfall Model has been considered as a basis for system development. The development process started by identifying system requirements, followed by EISMS proposal, EISMS design, EISMS implementation, and ended up with system validation and verification. In conclusion, EISMS was successfully developed and implemented during construction phase which allows top management of construction organization to monitor the construction site progress more efficiently and helps them in the decision making and taking timely appropriate action.

Abstract: RC shear wall with STRC (steel tube-reinforced concrete) columns and embedded steel plate has been proposed and used in the project of an International Conference Center. In order to ascertain the seismic performance of this kind of composite shear walls with different openings in the practical engineering, four 1/7 scale specimens with shear span ration 2.0 were tested under low-frequency cyclic loading. The load-carrying capacity, ductility, stiffness and its attenuation, hysteretic property, energy dissipation capacity and failure mode of the specimens were analyzed. The effect of the embedded steel plate and the concealed steel trusses on the seismic performance of the walls was studied. The results show that the ductility and load-carrying capacity of RC shear wall are improved greatly by setting the embedded steel plate or concealed steel trusses in the wall; The embedded steel plate and the concrete work very well through the stud connectors welded on the steel plate and the tie bars inserted in the walls; The STRC columns have the advantage of higher load-carrying capacity, not easy to crack and better ductility; The new composite shear wall has good seismic performance and important practical value. It is suitable for large and complex application of high-rise buildings in the seismic regions.