New Procedure for BIM Characterization of Architectural Models Manufactured Using Fused Deposition Modeling and Plastic Materials in 4.0 Advanced Construction Environments

This paper presents a new procedure for the building information modeling (BIM) characterization of structural topologies manufactured with plastic materials and fused deposition modeling (FDM) additive technology. The procedure presented here transforms the architectural geometry into an expanded three-dimensional model, capable of directly linking the topology of the plastic structure with the technological, functional and economic requirements for working in advanced construction 4.0 environments. The model incorporates a new algorithm whose objective is to recognize the topological surface of the plastic structural part obtaining in a fully automated way the FDM manufacturing time as well as the manufacturing cost. The new algorithm starts from the voxelized geometrical surface of the architectural model, calculating the manufacturing time from the full geometric path traveled by the extruder in a voxel, the extruder’s speed, the print pattern and the layer height. In this way it is possible to obtain a complete digital model capable of managing and analyzing the plastic architectural object in an advanced BIM 4.0 environment. The model presented in this paper was applied to two architectural structures designed for a real urban environment. The final structural geometries have been obtained through topological processes in order to reduce the raw plastic manufacturing material and to improve the plastic structure strength. The architectural elements have been validated structurally by the means of numerical simulations, following the scenario of loads and boundary conditions required for the real project. The displacement maps point to a maximum value of 0.5 mm according to the project requirements. The Von Mises stress fields indicate maximum values of 0.423 and 0.650 MPa, not exceeding in any case the tensile yield strength of the thermoplastic material.

The theme of India in the creative work of Semyon Chuikov

Статья посвящена творчеству советского живописца, народного художника, академика АХ СССР Семена Афанасьевича Чуйкова. В фокусе внимания автора живописные произведения художника, посвященные Индии. В отличие от наиболее изученных работ о Киргизии, ее людях и природе, индийская тема представляет еще много возможностей для изучения средств художественной выразительности и развития творческого метода С.А. Чуйкова. В результате анализа произведений разных лет в контексте биографии и мировоззрения художника автор статьи выявляет черты живописно-пластической структуры картин, особенности образов и колорита. Особое внимание уделено поэтизации образов простых людей Индии, их быта, а также мотивам женщины и матери, перекличке тем материнства и равноправия, демократизму художника. Отмечены характерные решения в композиции, пластике, а также стремление художника к большой форме, к монументальному обобщенному образу. The article is devoted to the work of the Soviet painter Semyon Chuikov, peoples artist, academician of the Academy of Arts of the USSR. The author focuses on paintings by the artist dedicated to India. Unlike the most studied works on Kyrgyzstan, its people and nature, the Indian theme still has plenty of opportunities to explore the means of artistic expression and the development of a creative method of S.A. Chuikov. As a result of the analysis of works of different years in the context of the artists biography and worldview, the author of the article reveals the features of the picturesque-plastic structure of paintings, especially images and color. Particular attention is paid to the images of Indian people , their everyday life, as well as the motives of woman and mother, the parallelism of topics of motherhood and equality, and the democratism of the artist. Characteristic decisions in composition, plastic, as well as the artists desire for a large form, for a monumental generalized image are noted.

Time-Frequency Energy Distribution of Ground Motion and Its Effect on the Dynamic Response of Nonlinear Structures

The ground motion characteristics are essential for understanding the structural seismic response. In this paper, the time-frequency analytical method is used to analyze the time-frequency energy distribution of ground motion, and its effect on the dynamic response of nonlinear structure is studied and discussed. The time-frequency energy distribution of ground motion is obtained by the matching pursuit decomposition algorithm, which not only effectively reflects the energy distribution of different frequency components in time, but also reflects the main frequency components existing near the peak ground acceleration occurrence time. A series of artificial ground motions with the same peak ground acceleration, Fourier amplitude spectrum, and duration are generated and chosen as the earthquake input of the structural response. By analyzing the response of the elasto-perfectly-plastic structure excited by artificial seismic waves, it can be found that the time-frequency energy distribution has a great influence on the structural ductility. Especially if there are even multiple frequency components in the same ground motion phrase, the plastic deformation of the elasto-perfectly-plastic structure will continuously accumulate in a certain direction, resulting in a large nonlinear displacement. This paper reveals that the time-frequency energy distribution of a strong ground motion has a vital influence on the structural response.