Advanced Materials Research Vols. 450-451

Abstract: Based on the analysis of the current new rural construction in China and relationship of origin and resource of city and countryside, the tridimensional development of rural residences are proposed to improve the land use efficiency in response to the demand for garden leisure and tourism from city levels in the urbanization process from the prospect of urban and rural complementation and resource optimization. It will thereby convert the industrial structure in the countryside, develop the local eco tourism and relevant service industries and increase the income and employment opportunities of farmers, which can change the quality of rural life and establish the tridimensional development models of new rural residence in China under the mechanism of city and countryside complementation and interaction fundamentally.

Abstract: Influence of factors such as displacement ratio and confining pressure on the dynamic properties of composite specimen with GC pile and CFG pile was studied under a wide range of strains by regression analysis，a simple method for calculating the dynamic elastic modulus and damping ratio is Proposed and an empirical formula considering the mentioned factors above is also presented to provide a elementary reference for anti-seismic design of composite foundations with GC piles and CFG piles.

Abstract: Hot compressive deformation behavior of non-modulation 33Mn2V steel for oil well tube was studied by compression tests using Gleeble-1500 thermal simulation machine conducted at the temperatures from 750°Cto 1200°Cand at the strain rates of 0.01 s−1 to 0.16 s−1. Using non-linear regression method to establish a Kumar model to predict the hot deformation behavior of 33Mn2V steel. Results show that the errors of the Kumar model between experimental data and calculated results are less than 10%. The deformation activation energy of 342.1841kJ/ mol. The average dynamically recrystallized grain size reduces with decreasing temperature.

Abstract: Using the method of lifecycle assessment (LCA) and building information model (BIM), this paper compares quantitatively the embodied carbon levels of three typical residential buildings: a five-storied townhouse, a fourteen-storied medium high-rise and a thirty-storied high-rise. This study consequently finds out that, in a specific period (i.e. from cradle to site), the medium high-rise emits the least embodied carbon and therefore is preferable in this respect.

Abstract: This research focuses on the interface’s impact on the macro-mechanics and damage mechanism of the fiber reinforced concrete (FRC). In consideration of the mesoscopic nonhomogeneity of the interface, numerical test has been adopted to simulate failure procedure of fiber reinforced concrete samples. It can, therefore, be concluded, that, the interface elastic modulus have a great impact on the macro-mechanics of the FRC. With interfaces added into FRC, failure could present ductile properties, cracks could be developed horizontally, and then unbonded and slid along the interface. During the process, phenomenons such as interface debonding and sliding, crack deflection, fiber bridging and pulling out could be clearly observed. Under With the premise that strength for interface is adequate for stress transferring, the toughness of the FRC would be enhanced by the interface.

Abstract: Chinese vernacular residence is a unique type of architecture which evolved through time under the special geographical conditions. From the beginning of the traditional residence, it has been constructed using natural materials, forming a set of mature construction methodology with natural material. The article analyzed and reflected on the traditional building material in west China. The construction of traditional villages and residence are taken as object of study to explore the building strategy of constructing vernacular village houses. Efforts have been made to establish a conversational relation between tradition and present world and also to propel the process of renewing the vernacular architectures rationally. Moreover, references can be provided to rebuild regional culture in vast rural area in China, and the sustainable development and creation of vernacular architecture.

Abstract: The article is based on the circumstances of urbanization in process in Northwest China. The problems in the construction of village houses are analyzed and the rational strategy regarding the urbanization and its influence on constructing houses, so that the problems once harassed the developed area can be avoided. After through investigation and analysis, we propose that the local construction in the context of urbanization should conform to the following principles: First, house construction should go with the resource and technological condition. Second, the construction should accord with the climate and environment. Third, the reasonable principle uses the land. Last, Integration of architecture and green ecological technology. The synthesis of the four principles above is the apt choice of constructing residence in Northwest China, which is expected to lead the local village living environment onto a sustainable path.

Abstract: Construction materials dominate the main responsibility to maintain the environmental sustainable development in human’s activities. Geopolymer concrete containing fly ash and recycled aggregate is a new concrete which can reuse the by-product of power station and waste concrete, as well as reduce the production of cement which contribute a lot of carbon dioxide emission in the manufacturing process. In this paper, experiments were carried out to investigate the mechanical properties and microstructure of geopolymer concrete with different recycled aggregate contents. Six mixtures were designed including alkali-activated fly ash geopolymeric recycled concrete and corresponding ordinary concrete as the comparison. The compressive strength of the concrete with 0%, 50% and 100% recycled aggregates was tested. The microstructure of these concrete were investigated by petrographic microscope under transmit light. According to experimental results, the strength development and failure mechanism are discussed. Furthermore, the application of such geopolymer concrete is discussed and suggested.

Abstract: Braced tubes, which carry lateral loads by axial actions of the perimeter columns and bracings, are very efficient structural systems for tall buildings. This paper investigates structural efficiency of braced tube structures employed for complex-shaped tall buildings, such as twisted, tilted and tapered towers. For each complex form category, tall buildings are designed with braced tube systems, and their structural efficiency is studied in conjunction with building forms. In order to investigate the impacts of various important geometric configurations of complex-shaped tall buildings, parametric models are generated using appropriate computer programs, and the models are exported to structural engineering software for design and analyses. Based on the study results, structural efficiency of braced tubes for each complex form category is estimated.

Abstract: Taking rammed earth residence of anji eco-house project in zhejiang province as an example, the ecological building technology used in its material selection, construction method, palisade structure practice, building design was analyzed, environmental impact of rammed earth residence was evaluated from two aspects of energy consumption and CO2 emission. It was found that energy consumption and annual CO2 emissions per area of rammed earth residence is far lower than that of common brick masonry structure residential, it shows the rammed earth residence has good ecological environmental protection performance and is worth to reference in other rural residential construction.