Applied Mechanics and Materials Vols. 71-78

Abstract: In AutoCAD2008 development platform, taking MFC and ARX as development, integrating MFC ODBC to develop database, combining with parametric drawing techniques, it establishes the basic framework of mechanical CAD system. And taking gears parametric drawing as an example, the key technology of CAD system is illustrated, which improves the design efficiency and shortens the development cycle.

Abstract: A study of approach wind flow simulation of the low-rise building was performed in a boundary layer wind tunnel at Shantou University. Three kinds of experimental configuration are employed to simulate the suburban terrain. The characteristics of three types of simulated flow are presented. The wind tunnel testing of low-rise building, 1 : 30 geometrical scale model of the Texas Tech University test building was performed in the simulated flow. The model and full-scale pressure coefficients are presented for high-turbulence boundary layer flow. The comparison of the scale model and full-scale model building point pressure exhibits a good agreement for most of the pressure taps.

Abstract: A study of approach aerodynamic shape optimization of a high-rise building, Shenzhen Kingkey financial tower, was performed in a boundary layer wind tunnel at Shantou University. Building shape has significant effects on the wind load forcing on the structure. The peak overturning moments about x-axis and the peak accelerations at the top of building are presented in this paper. Compared with the experimental results, one case is considered as the optimal case for structural design.

Abstract: Large-diameter cast-in-situ tubular pile (shorted as LTP) is a new, efficiency and energy saving, environmental protection pile and has been widely put into use in the foundation treatment. Using finite element method (FEM) to analyze and study the behavior of LTP is a very effective research method. This paper adopted the finite element computation software ANSYS 11.0 to conduct a 3-D numerical simulation for the LTP of a typical project. In this paper, it introduced how to realize the finite element model, specifically discussed how to select the appropriate key parameters and proposed an effective method and steps base on experience to determine the key parameters. By calculating, compared the calculated Q-S curve with the measured one and then analyzed the settlement behavior and the inner friction distribution of LTP, it is found that the inner friction only emerge at the bottom of the soil core and the upper part nearly does not have friction. The critical point in depth decreased and the maximum inner friction increased with the increasement of the load. Under the ultimate load, the sphere of influence of LTP decreased rapidly and the inner friction increased significantly.

Abstract: The paper is intent to open out the mechanism and effective distance of secondary anchoring in coal mine rock laneway support. Though the analysis of elastoplastic deformation, caused by heading face support removing in laneway development, the paper explained that secondary anchoring is necessary and important to rock laneway, and relatively exact data were given by FEM analysis. The paper illustrated a special example, and put it up with meticulous analysis, the results were not only having important reference value to coal mine soft rock laneway support, but also having definite use for reference to other mine soft rock laneway support.

Abstract: The low cycle fatigue (LCF) behavior of high-strength structural steel under biased strain control has been investigated. Seven strain ratios with constant maximum strain amplitude were adopted. Significant cyclic softening and mean stress relaxation were observed in all cases. The fatigue life under biased strain control could be well predicted by Coffin-Manson relationship. Fractography by scanning electron microscopy was used to determine the LCF failure mechanisms and fatigue crack propagation modes.

Abstract: It is hard to control the high pressure water in mountain tunnel construction. Distribution of seepage field, stress field and displacement field of tunnel are analyzed by numerical method with equivalent continuum model. And distribution rule of groundwater in rock, grouting circle and lining are also analyzed. The results of the study show that water pressure behind lining has a close relationship with rock, grouting circle, thickness of lining, permeability coefficient and drainage of tunnel.

Abstract: In this paper strength and wall stress of a steel silo were calculated in designing by using 3-D finite element method. According to the analysis result, intensity inspection and structure optimization were executed, which could provide the reference basis for construction design.

Abstract: With the sustainable development of China's economy, the engineering consulting industry plays an important role in various types of construction, in particularly in the huge construction projects. The purpose of the paper is to research the innovation of knowledge service for network-based engineering consulting industry. With the method of combining theory with practice and the application of connecting advance with feasibility, the situations and challenges of the network-based engineering consulting industry are introduced in this paper. What is more, the development strategy in the innovation of knowledge service for network-based engineering consulting industry is summed up, which can provide supports to adapt to the new situations for the engineering consulting industry.

Abstract: To address inadequacy of association rules interestingness measure method currently, we present a novel method to measure interestingness with relatedness among items in frequent itemsets. It firstly computed relatedness between frequent k-itemsets and each subset of frequent 2-itemsets, which is a linear combination of Complementarity Intensity (CI), Substitutability Intensity (SI) and Mutual Interaction (MI). The mean of relatedness of all frequent 2-itemsets subsets was regarded as relatedness of frequent k-itemsets. Finally weighted computation method of association rule interestingness was given according to principle of objective interestingness of association rule is inversely proportional to relatedness of frequent itemsets. The method can not only sort rules, but also analyze actual relationship among all items in frequent 2-itemsets, which is conductive to selection of users on rules.