Advanced Materials Research Vols. 243-249

Abstract: Constructive land suitability evaluation is the premise of effectively disposing land resource. China is in the historical period that urbanization develops fleetly; the demand of construction land grows rapidly; carrying on the research about method of constructive land suitability evaluation presents strong practical significance and broad application prospect. The paper summarizes basic analysis method of constructive land suitability evaluation based on GIS from five basic links which cohere each other, and then introduces the research development of constructive land suitability evaluation from angles of ensuring evaluation factor and factor weight, evaluation factor classification, land classification. Finally, the paper analyses research direction of this work from angles of consummating the evaluation method and using new mathematical method, releasing the related criteria by government department, and the combination between urban extended model, area development strategy, and GIS.

Abstract: The distribution of residential buildings is closely related to local climate conditions. This paper takes Xi’an region as its representative city to study the thermal conditions of various shapes of cluster distribution by utilizing energy consumption simulation. By sequentially changing the dimensions of each unit building in the cluster, it sets up models of mathematical examples which meet the requirements of different seasons. Based on the annual minimal energy consumption of buildings, the paper quantitatively expounds the influence of cluster distribution on buildings’ energy consumption. This study finally works out a recommendation for the cluster distribution in Xi’an region, i.e. the annual comprehensive energy consumption of buildings is at its minimum when buildings facing both south and north are “L”-shaped enclosures and when they have no westward extension and their length ratio between eastward extended exterior walls and southward level exterior walls is 0.5:1.

Abstract: The research of "3S" integration of the deformation monitoring system, is one of the important development trend of the deformation monitoring technology. This text analyzed the key technology of the application of GPS/GIS integration, realized the effective integration of the mass of datas of GPS and GIS technology, and to establish the GPS/GIS integration of deformation monitoring system provides important technical support.

Abstract: 2-D Coordinate transformation between different coordinate system including four parameters: two translations, one rotation, and one scale factor parameter. Because of ill-condition matrix, the common points’ little errors may cause big fluctuation of parameters’ results, which cause the four transformation parameters unreliable. Consider the comparability between coordinate transformation model and centre of gravity datum of free net adjustment, may eliminate the two translation parameters by auxiliary gravity datum condition. This article validate this method with instance.

Abstract: The breakthrough is usually a mine survey work with a strategy meaning for the overall work. This text analyses total station errors and makes use of the error theory by combining an concrete engineering example in order to instruct practice better and reduce the blind work. At the same time, it is necessary to adopt measures to decrease the error in the breakthrough practice, and then to guarantee the breakthrough work smoothly.

Abstract: Using ABAQUS software, three dimensional finite element model of a transmission tower-line system is created. Nonlinear seismic responses under three seismic records with and without strain rate effect are studied. The results show that the strain rate effect on the transmission tower-line system is more obvious with an increase in intensity of the earthquake. The influence of strain rate on the top displacement and base shear of tower under certain seismic records is unneglectable. Also, it is shown that the strain rate effect on the deformation of wire is prominent. The strain rate effect on the axial force of wire is neglectable. This simple study reveals the importance of considering strain rate effect in seismic analysis for transmission tower-line system.

Abstract: This paper highlights a two-level optimization process combined with ant colony optimization algorithm (ACO)，which is applied to design the shape of the transmission tower structure, and compiles optimization design procedure for the solution of the structure shape with the MATLAB language. By comparing the different methods of the transmission tower structure optimization design, the ACO algorithm is demonstrated to be more accuracy and practical in dealing the complex optimizations problem, i.e. the combination of continuous variables and discrete variables. These calculation examples illustrate that the two-level optimization method is reliable and versatile.

Abstract: The dynamic behavior affected by strain rate effect of the high-rise reinforced concrete shear wall structure subjected to seismic loading are analyzed by finite element software ABAQUS. The damaged plasticity model for concrete was used, and the strain rate effect of concrete and steel were considered. The nonlinear dynamic response results with strain rate effect are compared with the results without strain rate effect. The distribution of strain rate can not only influence the concrete and steel, but also have some effects on the dynamic response of the high-rise reinforced concrete shear wall structure. The strain rate effect is more prominent under the stronger seismic wave.

Abstract: In order to satisfy tunnel engineering survey and rapid transit railway engineering survey, this paper makes a study of the relationship between transition curve and neighbor point, and puts forward precise bisection method solution and approximate correction method solution which is suited to calculator. Besides, correction method is verified through comparing with bisection method to prove that its accuracy can meet engineering survey requirement.

Abstract: Based on theoretical models,the accuracy is analyzed to earthwork calculation in grid method under different terrain rolling rates, different grid widths.And the basic relationship between relative error of theoretical calculation and grid and terrain parameters is obtained, which can be used for evaluation of practical earthwork calculation.