Wyniki wyszukiwania - BazTech

1

Seismic behavior of cross-laminated timber panel buildings equipped with traditional and innovative connectors

Latour M., Rizzano G.

Archives of Civil and Mechanical Engineering

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2017

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Vol. 17, no. 2

382--399

EN

The aim of this paper is to analyze the possibility to improve the seismic performance of cross-laminated timber (CLT) panel buildings introducing in the structure dissipative connectors in substitution of the classical hold-downs. In fact, as demonstrated by past experimental tests and numerical analyses, hold-downs exhibit a limited dissipation capacity. The proposed dissipative connector is called XL-stub and applies the concept usually adopted for ADAS devices. In order to prove the effectiveness of the proposed system the results of an experimental program devoted to characterize the force–displacement response under cyclic loads and low fatigue behavior of the XL-stub are presented and compared to the results of cyclic tests of hold-downs with same resistance. Afterwards, the comparison is extended at the level of the building, evaluating the influence of the connection on the seismic performance of the whole CLT panel building. To this scope, a FE model of the three-storey building tested within the SOFIE project is calibrated and multiple transient dynamic analyses are performed both for the building with the classical layout of connections and for the building equipped with XL-stubs. The obtained results are compared and the values of the behavior factor for the two solutions are calculated.

2

Testing of composite panels used as components of a freight wagon by thermovision

Wróbel A., Płaczek M., Buchacz A.

Acta Mechanica et Automatica

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2016

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Vol. 10, no. 1

17--21

EN

In this paper research methods for detection of laminate panels damage were presented. The most common damage is: matrix cracking laminate interlayer damage to joints, connecting cracks, delamination and fiber breakage. The tested laminates will be used as assemblies and sub-assemblies of freight wagon. Other methods of modeling of machines by means of transducers are shown in Płaczek (2012, 2015) and Białas (2010). As part of the project authors were collaborated with specialists from other research centers and scientific research (Bocian and Kulisiewicz, 2013). As a part of future work the places where we will be able to replace the standard materials by parts made of laminate will be shown. Layered composites despite many advantages have also disadvantages. From last mentioned it is a relatively low resistance to transverse impact. When the laminate is used as a decorative element, its small damage is not a problem. The problems start when the composite satisfies more responsible tasks such as: is a part of the technical means for example of a railway wagon. Aspect of continuous monitoring of the technical state of the laminate is very important. Current technology provides numerous opportunities for non-destructive methods of technical inspections. In this paper method for testing of large areas, completely non-contact, based on the methods of thermography, was presented. It consists heating by using the composite tubes and examining it through a thermal imaging camera. Length of heating, and consequently the temperature to which the laminate is heated mostly were chosen experimentally. During the measurements, the camera measures the intensity of radiation, not temperature. Received thermogram is not always a precise representation of the actual temperature, because the camera does not reach only the radiation from tested object, but also reaches the radiation coming from the environment and reflected objects etc. As part of the research authors also we undertook other work related to Mechanical Engineering (Wróbel et al., 2008, 2010, 2012, 2013, 2015; Płaczek et al., 2014). Cooperation with other national and European centers has contributed to many publications of authors for example Tuma et al. (2013, 2014) and Jamroziak and Kosobudzki (2014).

3

Deformation of beech wood – the sources and their identification before beech logs processing

Kúdela J., Gryc V., Tóth V.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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No. 87

121--125

EN

Longitudinal buckling is a very serious problem in production of solid wood panels assembled of beech lamellae joined alternatively breadthwise and longwise into large-sized blocks. The aim of our work was to identify the main factors causing misshaping of beech dowels in solid wood panels production, with the primary focus on identification of reaction tension wood in dowels and logs. According to our results, the most common source of longitudinal buckling of beech dowels was the presence and non-uniform distribution of tension wood in them. The tension wood occurrence in logs is possible to predict with a considerable confidence based on eccentric pith presence. The tension wood presence and distribution over the cross section are possible to identify if the cross-cut surface has been milled and its moisture content reduced under FSP. The tension wood can be discerned through its lighter hue and pearlescent-white gloss.

4

History and perspektives of paneling building-up. Part I.

Kubečková-Skulinová D., Kubenková K.

Roczniki Inżynierii Budowlanej

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2011

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z. 11

95--102

5

Load carrying capacity of sandwich panels

Spanik P.

Zeszyty Naukowe. Budownictwo / Politechnika Śląska

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2007

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z. 112

369-372

EN

The determination of the load carrying capacity of sandwich panels using different conditions: shear strength, buckling strength and deformations are presented. The influence of the quality of the core material (polyurethane foam) for the load carrying capacity is investigated.

PL

W artykule przedstawiono różne sposoby obciążenia paneli. Zbadano wpływ jakości rdzenia (pianka poliuretanowa) na sposób przenoszenia obciążenia przez panel.

6

System channeline

Helak J., Kniat E., Obłoza R.

Prace Naukowe Instytutu Inżynierii Lądowej Politechniki Wrocławskiej. Konferencje

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2002

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Vol. 50, nr 19

123-128

PL

Wiele przewodów kanalizacyjnych jest eksploatowanych od ponad wieku i już dawno upłynął ich planowany okres trwałości użytkowej. Zwiększone oczekiwania w zakresie parametrów, obejmujące odporność na stosowane współcześnie substancje korozyjne i duże obciążenia pionowe są źródłem dodatkowych wymagań przewyższających możliwości istniejących sieci. W eksploatacji znajduje się jeszcze wiele kolektorów o przekrojach niekołowych -jajowych, gruszkowych, dzwonowych, a także przekrojach o złożonym kształcie. Do renowacji tego typu kanałów przeznaczony jest system Channeline. System ten, polegający na wykładaniu kanału od wewnątrz panelami z żywicy poliestrowej i włókna szklanego, daje podobny efekt jak relining rurami HOBAS kanałów kołowych. Renowacja z wykorzystaniem produktów Channeline stanowi oszczędny i bezpieczny wybór w porównaniu z wymianą przewodów kanalizacyjnych, zapewniający ogólną poprawę przepustowości i mniejsze zakłócenia w ruchu ulicznym i działalności gospodarczej.

EN

A lot of old non-circular channels in towns needs a renovation. For this renovation was invented a system of GRP panels named Channeline. The panel shape is designed for existing channel. The channel after relining with Channeline panels has high mechanical and chemical resistance, and the system guarantees more than 50 years of safety. The panels are designed according to WRC Sewerage Rehabilitation Manual as Type I, so they are resistant against ground loads, traffic loads and the ground water pressure. In this report was described also the procedure of panels laying and according standards and technical approvals in UK. and Poland.