Papers by Keyword: Code

Abstract: Paper is devoted to the automation of processing the results of measurements of mechanical characteristics of plated specimens and the creation of a mathematical model of anisotropy material. Methods of conducting tensile and flexural tests are described. Developed in MATLAB tools for automation of processing results of experiments are proposed. Tools can be used for interpretation of the results of strength tests of isotropic and composite materials. The advantage of the developed tools is batch processing, which allows processing the results of a large series of experiments. The tools system was tested when creating a model of short-reinforced composite material. An example of the use of test results when constructing the Digimat material model and using this model to predict the stress-strain state of anisotropic structures is presented.

Abstract: The Brookfield_to_MATLAB and ViscosityApproximation codes for processing of experiments results for determination of viscosity on a rotational Brookfield DV3T viscometer is developed in the MATLAB. The codes allow to carry out automatic capture data, to calculate the shear rate for standard spindles RV-1 ... RV-7, to sort the measurement results on temperatures, to combine the experimental data and to determine the coefficients of the Andrade type power-law model. Paper describes experiment results on determination of viscosity of the epoxy binder reinforced by short carbon fibers. The coefficients of the viscosity model are determined by the linear regression coefficients. The obtained determination coefficient shows a good agreement of the model with the experimental data. The results are used for study various contents of a mass fraction of fibers: 0%, 5%, 10%, and 15%.

Abstract: In this study, both Canadian and European code provisions for steel concentrically braced frames (CBF) are discussed and issues addressing ductility classes for brace cross-sections, q factor value and brace configurations as covered in Eurocode 8 are presented. From comparison with the Canadian provisions it is concluded that beams and columns of CBFs designed according to Eurocode 8 could be under-design when braces perform in the inelastic range. A prototype 8-storey CBF building with multi-storey X-braces is designed and analysed in agreement with both code provisions. The nonlinear seismic responses are presented in terms of interstorey drift, residual interstorey drift and floor acceleration. It was concluded that both buildings are able to yield similar base shear, show similar floor acceleration while the European building undergoes larger residual interstorey drift.

Abstract: The behaviour factor (q-factor) is a factor introduced in Eurocode-8 (EC8) to reduce the seismic elastic forces of structures obtained from an elastic analysis accounting for their ductility and overstrength. Seismic codes, especially the EC8, gives a constant value for q-factor, since change in structural characteristics of building change in behaviour of braced steel structures and that affects on q-factor. In this paper, the q-factor is evaluated for X-braced steel structures using pushover analysis. The effects of brace slenderness ratio and stories number are investigated. The results of this study indicate that the most important parameter that affects the q-factor is the brace slenderness ratio. Furthermore, the EC8 recommends a higher than actual value of q-factor, which is potentially unsafe.

Abstract: Nanostructured materials have gained a lot of importance in the latest technologies due to their amazing mechanical, thermal, and even nuclear properties. Either used as classic protective coatings or particle detectors, nanostructured materials require special synthesis methods, from physical or chemical vapour deposition, flame synthesis to plasma processing. The complex phenomena accompanying their synthesis required the deep study of the thermodynamic parameters of such systems, with special emphasis on a theoretical approach which is independent to the synthesis method and generally applicable. The complex mathematical description of such phenomena and the solution to the thermodynamic functions of the system, achieved in many cases by numerical methods, was often done by strong commercial codes. Despite the efforts, many of the predicted synthesis parameters did not match experimental determinations, and furthermore, conducted to confusing and even wrong results regarding especially the pressure and temperature range required to obtain the quality materials. The present work aims to draw a comparative computational analysis of nanostructured materials, indicating not only some commercial code results, but also the differences in softwares, methods, theoretical approach and conclusions. Both similarities and differences are underlined by the numerical and graphical solutions, as offered by various commercial codes, revealing strong and weak aspects in thermodynamic considerations. The output of such a computational thermodynamic analysis doesnt depend on the synthesis method, but on the assumptions done and the materials under evaluation, and presents a good concordance with many experimental data, either obtained during authors work or literature-reported. The study is useful when needing the synthesis parameters, such as temperature, system and component pressure, feedstock composition, the degree of freedom analysis, the Gibbs free energy, the driving force, the phase diagrams, the pressure-temperature or pressure-volume graph. Taking into account the balance between assumptions, accuracy, and effective nanostructured material, one has to choose the most suitable commercial code and approach in order to obtain the a-priori thermodynamic characterization of the system.

Abstract: This article presents the new mini-language for effective definition of color gradients for the languages ​​of vector graphics. Mini-language supports two types of gradients: linear and radial. It lets define all variants of color transitions supported by modern vector systems. The code is much shorter and easier than in its alternatives such as XAML and SVG. The entire definition is written within one intuitively the assembled string. Implementation of the presented mini-language could substantially encapsulate and streamline the source code for vector graphics.

Abstract: The wind pressure asymmetric coefficient is used to express the variation of wind distribution along the transmission line. In this paper, the value of the wind pressure asymmetric coefficient in some international codes is discussed and compared. It’s shown that the coefficient has no relationship with the span length of transmission only in Chinese code. When the span of the checked transmission line is small, the wind pressure calculated based on Chinese code will be smaller than that based on others.

Abstract: Basic spectrum of categorized hub according to its form is obtained based on search of radical method. Various level codes arise with increasing number of hub samples which belong to basic spectrum subcodes. Transitional form can be created by computerized continuous deformation technique, according to which new codes are generated automatically, and then the codes auto differentiation can be realized. By this way, automatic adjustment, richness and perfectness of the basic spectrum can be achieved, and the efficiency and initiative of categorization can also be improved.

Abstract: This paper has discussed the design of the data information smart search support system according to certain data base, building phrase dictionary, and adopting the first code input of phrase spelling and Chin-English translation. It has achieved the functions such as the fast editing input and check of search code, and the dictionary maintain. Therefore, it has supported the person who searches information and the person who edits code fast with the data base.

Abstract: Seismic liquefaction is a major geological hazard of earthquakes. In the paper, the earthquake liquefaction of subway engineering in GUANGZHOU is calculated based on the standard penetration test method according to the rules of code for seismic design of buildings, specifications of earthquake resistant design for highway engineering, code for water resources and hydropower engineering geological investigation as well as the railway engineering anti-earthquake design specification. It is concluded that different code have very different result on sand liquefaction discrimination. And the data selection is a key factor when we discriminate sand liquefaction. The shortage of codes is evaluating the site liquefaction according to the data of points. The conclusions have positive role for engineering seismic liquefaction discrimination and the seismic liquefaction mechanism research.