Advanced Materials Research Vol. 743

Abstract: The purpose of this study is to investigate the thermal environment of a radiant floor cooling system using the existing radiant floor heating system. The thermal environment of the model office space was analyzed using Computational Fluid Dynamics (CFD) method. Two typical air distributions (hybrid air cooling system composed of radiant floor cooling and displacement ventilation and all-air system) were simulated. Installing two human models in the office, the characteristics of heat transportation from the human model were also analyzed. The results show that two air distribution forms can meet the demand of thermal comfort. The operative temperature in the radiant floor cooling system was lower than in the all-air cooling system when each of the sensible cooling loads of the two types of HVAC system was the same.

Abstract: Some damage phenomena often happens in deep mining, in order to study and solve that difficult problem, three finite models are established. The shear stress, minimum principle stress, and maximum principle stress and displacement distribution is analyzed. Some useful results are got, and it has some reference value to tunnel mining engineering.

Abstract: Some engineering damage often appears in deep mining. In order to solve that engineering problems, finite element software ANSYS is used to analyze roadway displacement and stress under different support conditions, which including model with on support, with anchor support, with anchor and cable support and with U steel support. Some useful results, which have reference value to mine engineering, are achieved in this study.

Abstract: The objective of this research is to investigate the dynamic responses of the masonry structure with base-isolation system under the vertical earthquake. Through inter-story shear model with the multi-degree of freedom, the equation of motion and the distinguishing rule between slide and joggle were established. The effects of vertical component of earthquake on the response of pure-friction base-isolated structure were analyzed. Results show that the inter-story displacement, inter-story shear force and acceleration at lower layers are increased, but the response value at topper layers and the maximum displacement at isolated layer are less affected. The maximum displacement at isolated layer is mainly affected by frictional coefficient, sort condition and earthquake intensity.

Abstract: To adapt the serious temperature deformation, the rigid hinge expansion joint is used in the Jiashao Bridge. The vertical rotation test and shear deformation test are conducted to check the vertical motive performance of the expansion joint, and the test results show the rigid hinge expansion joint can meet the design requirements.

Abstract: Statistical data shows that monopile foundation accounts for more than 65% of all foundations for offshore wind turbines,so it is of great engineering value to perform the research on the design and analysis of the monopile foundation. By its application environments and structure features,based on a design example of monopile foundation for a offshore wind farm,the paper performs the following sequence of works including the establishment of finite element model for monopile foundation, the calculation of foundation bearing capacity and deformation, modal analysis and fatigue analysis, etc.The paper gives the related design results, which is used for reference for designers.

Abstract: Friction stir welding (FSW) is a relatively new solid-state fastening method which is suitable for joining advanced lightweight metal sheets that are hard to weld. Latest literature relating to finite element analysis (FEA) of FSW process is reviewed in this paper. The recent development in FEA of FSW process is described with particular reference to three major factors that influence the performance of FSW joints: modeling technique, tool design and process parameters. The main FE methods used in FSW process are discussed and illustrated with brief case studies from the literature.

Abstract: This study investigates the effectiveness of dissipative knee bracing as seismic performance improvement strategy for steel frames. A simplified model of a knee element is used for global analyses of frames in order to accurately simulate the bending and shear behaviour observed in laboratory tests reported in literature. The seismic response of a five-storey steel frame incorporating dissipative knee elements is investigated. Nonlinear static analyses are performed to estimate the deformation capacity of the frame and to assess the sequence of yielding in the members. Nonlinear dynamic analyses with different seismic intensity levels are carried out to compare the seismic behaviour of the steel frame in the unprotected and protected configurations. The results of the numerical investigations show that the use of knee elements has the potential to improve the seismic performance of steel frames.

Abstract: The paper studied the dynamic second order effects response of the single-degree-of-freedom (SDOF) system under vertical earthquake ground motions. The following achievements have been made: (1) the motion equations under vertical earthquake loading with second-order effects were established; (2) through numerical analysis, the regular patterns of structural dynamic second-order effects subjected to vertical earthquake loading are uncertain.

Abstract: Two different kinds of steel-encased concrete composite beam connected concrete filled low-cycle reversed loading. The test results indicate that the two joints both have higher bearing capacity, better ductility performance and seismic behavior. In order to theoretically analyze the joints force mechanism, the nonlinear finite element analysis (FEM) of the above two joints has been conducted by using the ANSYS program. According to the results of FEM, the hysteretic curves and the skeleton curves are deduced. And from the contrast between the test results and the finite element results on energy dissipation capacity and ductility, it indicates that the theoretical results and the experimental results are basically coincident. But the errors of them are occurred due to the difference of material constitutive model. The precision of the nonlinear finite element analysis of reinforced concrete is depending on the constitutive relation of concrete to a large extent.