Wyniki wyszukiwania - Biblioteka Nauki

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Przyczyny techniczne awarii rusztowań. Cz.4

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Błazik-Borowa E.

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2018

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tom R.22, nr 5

75--77

EN

The paper deals with technical aspects which influence the load-bearing capacity and the operation of scaffolds during a construction. The complexity of the problem is presented in the example of failure of a modular scaffold which, after assembly, did not satisfy the conditions for the ultimate limit state and finally it failed due to the wind action. Next the author presented the following technical problems: formation of the main structure of scaffolds, bracing sets, foundation of scaffolds, load-bearing capacity of the anchors, the accuracy of assembly, technical state of the elements, loads acting on scaffolds. The impact of these factors on the possibility of scaffolds failure is illustrated with an example of a facade scaffold. For this scaffold the effort and the natural frequencies were determined in the following situations: the structure with perfect geometry, the structure with imperfections, the scaffold with perfect geometry and taking into account the uneven ground subsidence, and the scaffold with imperfections and uneven subsidence included. The numerical analysis showed that the scaffold does not comply with conditions for the ultimate limit state and that the most important for the capacity of the structure and its proper functioning is the accuracy of the scaffold assembly.

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A comparison of distance sampling methods in Saxaul (Halloxylon ammodendron (C.A. Mey Bunge) shrub-lands

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Kiani B. , Fallah A. , Tabari M. , Hosseini S. M. , In Parizi M.-H.

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tom Vol. 61, nr 2

207--219

EN

The primarily goal of plot-less sampling methods is to reduce costs and rapid survey of plant communities. First full inventory was conducted in two 30-ha sites of Saxaul populations geo-morphologically different. In first site (site I), population had random pattern while in second site (site II) clumped pattern was observed. Crown diameters and spatial situation of all trees were recorded using distance and azimuth. Data were transferred to computer and stem map was generated with ArcGIS Software. Distance sampling methods include point-centred quarter method (PCQ), joint-point method (JP), Random pairs method (RP), T-Square method (T-Sq) and Quartered neighbour methods beside fixed area plot (FAP), n-tree and variable area transect (VAT) methods were conducted on generated stem maps. A time study was done aiding indices determined in field works. In site I, point centred quarter estimator with measurements to the second closest individual in each quadrant had the lowest relative bias (RBIAS) in estimating density followed by 3-tree and closest individual methods. In clumped pattern (site II), variable area transect method with measurements to the 4th and 5th closest individuals in each transect brought the best results. The most time consuming methods after fixed area plot, were point centred quarter estimators while methods considering measurement to the closest individual were rapid. Considering RBIAS and Time together, VAT method was the best sampling method in clumped pattern followed by point centred quarter estimator with measurements to the second closest individual in each quadrant and closest individual estimators. In random pattern, point centred quarter estimator with measurements to the second closest individual in each quadrant was the best method followed by 3-treeandclosest individualestimators. But for estimating cover per unit area N-tree methods performed well. As in this site, VAT method located in 4th grade, and due to simplicity of field works related to this method, in the case that the investigator would not be able to clearly define spatial pattern of the population, this method can be recommended as well.

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Badania wybranych elementów zabudowy śródmieścia miasta Tyczyna

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Rybka A. , Pełczyński J.

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2000

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tom z. 32[180], cz.1

419-426

EN

The paper presents a part of research carried out in the town of Tyczyn. The main goal of whole research is to prepare data for "implementation plan" as the grounds for reconditioning plan of the Tyczyn center to adapt it present economic and social conditions. The provided inventory activities were made towards establishing all possibilities of restructuring the existing buildings. Three characteristic buildings for downtown Tyczyn center were selected for the research; Rynek 6, Rynek 20, Rynek 21/22.

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Zastosowanie wybranych technologii BIM w inwentaryzacji oraz projektowaniu konstrukcji budowlanych

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Gajewski J. , Fajtek D.

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tom nr 3

48--50

PL

W artykule przedstawiono doświadczenia autorów ze stosowania wybranych technologii BIM w inwentaryzacji oraz projektowaniu konstrukcji budowlanych. Omówiono procedurę inwentaryzacji geometrii konstrukcji na podstawie chmury punktów uzyskanej za pomocą skaningu laserowego. Zaprezentowano możliwości modelowania 3D rzeczywistej geometrii konstrukcji na potrzeby oceny jej nośności, a także ograniczenia związane z BIM.

EN

The article presents the authors' experience in the use of selected BIM technologies in the inventory and design of building structures. The inventory procedure of structure geometry based on a point cloud obtained by means of laser scanning was discussed. The possibilities of 3D modeling of the real geometry of the structure for the purposes of assessing its bearing capacity were presented. The article presents both the possibilities and limitations associated with BIM technology.