Advanced Materials Research Vols. 594-597

Abstract: This paper uses the ANSYS to set up the finite element model of the bituminous pavement after the reflection crack, through applying the transportation loads, calculating the stress of the pavement structure and the stress intensity factor, obtaining the influence of basic-level reflection crack on the pavement structure, to supply scientific evidence for the control of basic-level reflection crack and the improvement of the pavement structure.

Abstract: In this paper, a design of 2-3-dimension transformation for helmet with Rhino Developer Platform is presented. In the design, helmet from two-dimension to three-dimension and from three-dimension to two-dimension have been realized. After transformation the two-dimension helmet pieces and the three-dimension helmet pieces content their area, length of boundary lines and position of mesh points on helmet pieces approximately equal. This design is controlled and realized by VC++ program. At last, the visual effect of transformation is provided in Rhino Operating Platform and meanwhile its implementation is validated.

Abstract: The hydropower project is generally located in the mountains or deep valleys. Due to the expansive irregular topographic form and the extremely complex geological structures, the modeling and visualization process remains technically challenging. In this paper, a NURBS surface modeling technology was applied to build a 3D geological model of the dam site region. Moreover, according to project needs, typical sections were cut to analyze the geological conditions and engineering measures were proposed. This model not only occupies small storage and has low accuracy loss, but also could be easy to operate and analyze graphics visually. The proposed method can provide a convenient, intuitive and multi-dimensional support tool for geological analysis of hydropower project.

Abstract: The purpose and significance of bridge health monitoring is described in this paper. In order to study bridge health monitoring, Firstly, a finite element model for simply supported steel beam is set up on the basis of the Infinite Element Theory and the software ANSYS in response to laboratory experient. Through adding instantaneous excitation to the mid-span, do modal analysis for different injury of steel bridge model to reveal the natural frequency and mode shapes of the different injury of steel bridges, identify the different injury by comparing the index value and the rate of change.

Abstract: The mine accident prediction model was established on the basis of the fractal theory. The model has made an accurate check by the existing accident data. The predict results are 73 and 45, and the average relative error rate is 4.8%, which is rather satisfactory than ever compared to the actual data. Finaly, the example based on the model is used to make a prediction to the accidents numbers in June 2012-August 2012, and the predict results are 48, 43 and 44.

Abstract: A wavelet estimation method is presented herein to estimate deep pit settlement. In this method, the pit settlement is decomposed into the trend settlement and the stochastic settlement by using Wavelet Analysis based on the characteristic of influencing factor. The model identifier is established by using artificial neural network (ANN), and trained to approximate the trend settlement. Then, the prediction controller developed could be applied for estimating the actual settlement. Finally, the verification examples show that the WIAN is an effective tool for predicting the pit settlement dynamically , high precision could be expected and achieved.

Abstract: To shorten calculation time in finite element simulation by using multithreading computer, a parallel algorithm for stiffness matrix decomposition based on threadpool method is proposed. Firstly, a decomposition method of applicability to parallel computation is put forward by transferring the Cholesky's LLT method. Then, the threadplool is employed to generate multithreading for repeating use and the optimization is conducted considering load-balancing of each thread. Finally, numerical tests by using proposed algorithm in decomposition of one-dimensional array stored stiffness matrix are carried out on different calculation platforms with multi-processors. It is shown that the parallel algorithm can overcome the limitations of OpenMP when being applied in nested loops and is of high efficiency on stiffness matrix decomposition with low platform demands. The algorithm has explicit concept and minor programming difficulty and is applicable to solve problems caused by limitation of OpenMP in particular.

Abstract: Green Building and Information Model are the focus and developing tendency in the future. Therefore, the combination of the two will push and accelerate the progress of Chinese Green Construction forward. Thus this paper attempts to introduce the idea of GBIM, which takes information flowing technology as the nucleus, is the compound of data integration of BIM and integral management, is also the integration of information exchange and concordance for the tool software at different phases and in different professions with green construction process and tasks. At last, this information flow technology is applied to information flow model building in the green construction planning and designing.

Abstract: In order to rapidly, accurately and vividly provide plenty of underwater soil analysis information for design and construction in dredging engineering, this paper took Qinhuangdao harbor project as an example, introducing a three-dimensional underwater soil modeling method and establishing the 3D unified soil solid model of Qinhuangdao harbor. The model has a small amount of data storage, high precision and is easy to operate graphical computing. Based on the model, and with 3D visualization technology, a series of soil visual analysis were conducted, including virtual digital drilling, arbitrary cutting analysis and water depth elevation analysis. Moreover, the model could quickly output scene graph, 2D cross-section and isoline map. Practical engineering applications indicate that 3D dredged soil visualization helps engineers to understand the space distribution of underwater soil. The proposed method can provide a convenient support tool for dredging engineering soil analysis.

Abstract: The new city in Daxing district is the focus of future development in the southern of Beijing city, establishing 3D geological model of its engineering construction layer can provide a scientific basis for urban planning and construction as well as the land’s proper utilization. After collecting the geological drilling data, we establish the geological model based on a 3D geological modeling platform developed by Peking University. The 3D spatial modeling method based on sections is used to analyze two key technical problems about simulation process named high-precision modeling and rapid modeling respectively. In the modeling process, Delaunay triangulation and Kriging interpolation algorithms are used. Furthermore, the manual intervention is achieved through the use of flexible and convenient 3D interactive modeling tools. The application examples indicate that the 3D geological model constructed by this method can better reflect the actual situation, it also possesses the advantages of high precision and fast modeling.