Advanced Materials Research Vol. 663

Abstract: For developing regional green building, it is very important to absorb the traditional architectural conception of energy conservation. Based on this, this article discusses a series of regional green building design strategies focusing on four aspects. First is responding to regional material, includes making use of local materials, modern renewal of traditional material, reuse of waste materials. Second is responding to regional natural climate, includes “closed insulation + solar energy use”, "ventilation + sunshade", "active ventilation + shade + activities insulation" and active utilization strategy. Third is responding to terrain elements, includes minimum of terrain environment damage and reduction of earthwork volume. Last is responding to regional culture, including expression of traditional materials, restructuring of traditional construction, modern interpretation of traditional regional.

Abstract: All kinds of Chinese traditional dwellings are naturally ecological architecture because of their coordination with environment and nature. Firstly, this paper describes the concept and meaning of Chinese traditional dwellings and ecological architecture, analyzes and summarizes the eco-design strategy of Chinese traditional dwellings, including combination with topography, adaptation to climatic, using local materials. Besides, discusses the architectural characteristics, such as patriarchal system concept, regional culture customs. By which, extends to the strategy of modern ecological architecture design, for instance, rooting in particular geographical environment, focusing on the regional cultural heritage and Keeping up with the Times Innovation opens up new ideas for further research and design of the ecological architecture.

Abstract: According to the phenomenon that global damage detection of jacket platform is influenced by structure redundancy of damaged member, the concept of modal redundancy index (MRI) of damaged member is proposed. Through numerical simulation by means of mode strain energy method, the way that MRI of damaged members in different types and positions changed was studied, as well as the relationship between MRI and global damage detection. The numerical simulation result demonstrated that when MRI of pile element is less than 2.1×103, damage can be detected; when MRI of slanted brace element is less than 1.5×105, damage can be detected; when MRI of horizontal brace element is more than 5.8×105, damage cannot be detected. Therefore MRI can be a reference index in engineering application of global damage detection of offshore platforms.

Abstract: This paper frame structure stair design problem, the stair to participate in overall structure calculation and setting sliding connection are discussed.

Abstract: Rich achievements have been gained on the problem of early age concrete. The application of concrete maturity is widely used in engineering to describe the strength of early age concrete. This paper presents the concept of maturity, research results of concrete maturity by scholars from both domestic and foreign areas, its development history, and method applicable scope of it. Degree of hydration method is also mentioned to make comparisons with maturity method. Both are recognized as valid tools to describe the strength behavior of early age concrete.

Abstract: The paper presents an experimental study on the behavior of axial loaded concrete-filled steel square-tube stub columns with high strength fiber reinforced concrete until failure. Four specimens were tested to investigate the effect of high strength concrete on the load carrying capacity of the concrete-filled steel square-tube stub columns. The effect of the presence of steel fiber in high strength concrete which filled in the steel tube was also investigated. The main parameters in the tests were: (1) the strength of concrete (30 Mpa and 100 Mpa), and (2) the use of reinforcing steel fiber in concrete (plain high strength concrete and steel fiber high strength concrete). The main purpose of these tests were three-step: (1) to describe a series of tests on composite stub columns, (2) to analyze the influence of several parameters, and (3) to compare the accuracy of the predictions by using the specifications in the code (ACI and EC4 etc.) for the design of high-strength composite columns. Experimental results indicate that the high strength of concrete and use of steel-fiber in concrete had significant influence on both the axial compressive load capacity and the ductile of the steel square-tube stub columns.

Abstract: The buckling load or the equivalent buckling length factor of the portal frame structures is greatly influenced by stiffness of bracing elements and semi-rigid connections. In engineering the problem parameters (geometrical, material, strength, and manufacturing) are given or considered with uncertainties. The initial rotation stiffness uncertainties are taken into consideration. A differential evolution-based computational strategy for the representation of epistemic uncertainty in a system with evidence theory is developed. An uncertainty quantification analysis for the buckling load of portal frames with semi-rigid connections is presented herein to demonstrate accuracy and efficiency of the proposed method.

Abstract: Color image processing is seldom used in the recognition of roads and slopes collapse. And the application can bring great advantages to the traffic safety. Color image segmentation is the first and key step of the recognition system. By analyzing existing methods of color image segmentation, several drawbacks have been discovered. This paper proposed a novel and efficient segmentation approach which is suitable for the recognition of collapse. The Region of Interests (ROIs), i.e. the roads and slopes, was obtained with the ingenious use of the images characters. According to combine K-means clustering with region merging, connected-component algorithm and close operation, the roads and slopes are segmented with the statistical color features, geometrical features and the location of the objects. Experimental result shows feasibility and efficiency of the proposed approach.

Abstract: The bottom surface of the bridge beam, which is made of C50 high-strength concrete, is heated to 800°C in fire-resistant experiment. Then the elastic modulus and strength of the concrete are measured by the rebound method and core sampling method, and the test results are used to validate the theoretical methods. The study shows that the strength and elastic modulus of concrete decrease with the increasing of temperature. The strength from the current theoretical analysis agrees well with that from the experiment. But for the elastic modulus, there is a great difference between the theoretical and experimental analysis. The strength of the concrete after fire gotten from the rebound method has a bigger error than that from the core sampling method, so that the core sampling method should be used in preference.

Abstract: In the newly developed excavation system for construction of basement of building, steel elements plays a role as temporary member before casting floor concrete, but it do behavior as composite beam mixed with concrete after floor slab has been casted. That is, it is necessary to review if axial stress loaded in steel beam can be conveyed properly to slab, as casting concrete slab under conditions of application of compression to the steel beam In this manner, this paper presents the experimental result of the composite beam subjected to both constant axial load and variable vertical load. Main parameters in the test are magnitude and loading time of axial force. As a result, it was found that there was no effect on the flexural strength according to the timing of compression and axial force. The flexural strength of the composite beam subjected to both a constant axial compression and increasing vertical load could be predicted with somewhat safety by using code equations.