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Prototype articulated joint in connections of the concrete protective barrier

Borkowski W., Hryciów Z., Rybak P., Wysocki J.

Journal of KONES

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2011

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Vol. 18, No. 1

85-92

EN

The work describes methodology of selection of a prototype articulated joint used to connect the segments of the concrete protection barrier. The barrier and the joint have been made according to the original project of the authors of this paper. Dimensions of the component elements of the joint were defined on the basis of numerical calculations in LS-DYNA system, using finite element method. They also allowed to identify places sensible to damage. Based on the project, the experimental tests have been performed for the joint strength to stretching. The tests performed on the resistance machine showed improper technology and poor quality of welds joining individual elements, particularly the bolt with connecting steel. Results of these tests made the basis for introducing the changes to the project. Repeated tests confirmed their rightness. The final evaluation of quality and usefulness of the prototype articulated joint in the connections of movable protection barrier were defined during the crash tests on the test track of the Certified Research Laboratory of the Research Institute for Roads and Bridges. The crash tests were performed for selected collision criteria (TB11 and TB32), normal restrain level (N2), using three passengers cars. Applied concrete barrier test procedures are in accordance with the requirements of national standards, that make the equivalents of the European standards.

2

Nowe rozwiązania połączeń przegubowych stosowane w urządzeniach

Tubielewicz K., Turczyński K.

Technologia i Automatyzacja Montażu

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2009

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nr 1

13-17

EN

The application of split pins and grooved pins in mining roof supports is presented. It is demonstrated how this type of new articulated joint solutions facilitates their fitting to and removing from bulky and large-size equipment.

3

Model of the Connector for 3D Distance Knitted Fabric Fastened by Articulated Joints

Supeł B., Mikołajczyk Z.

Fibres & Textiles in Eastern Europe

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2008

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Vol. 16, no. 5 (70)

77--82

EN

During the first stage of our considerations,a model of the compression process of a3D distance knitted fabric was related to a single connector fastened to it by articulated joints, and considered as a slender rod with an assumed shape. In our physical and mathematical models, the compression of a slender, elastic rod was based on assumptions concerning the knitted fabric’s morphology, as well as the mechanical properties of the threads, particularly monofilament splaced in the internal layer of the fabric.A calculation method was developed which enables to determine the functional dependencies between the compressing force and bending deflection,as well as a method of determining curves representing the shape of the compressed rod – connector. A computer simulation of the compressed rod connecting the two outside layers of the knitted fabric, considering the variable parameters of the model, was carried out with the use of calculation algorithms elaborated by us, and MathCad program.

PL

Model procesu ściskania dzianiny dystansowej 3D w pierwszym etapie rozważań odniesiono do pojedynczego łącznika przegubowo zamocowanego, traktując go jako smukły pręt o zadanym kształcie. W modelu fizykalnym i matematycznym ściskanie sprężystego pręta oparto na założeniach uwzględniających zarówno morfologię dzianiny jak i własności mechaniczne nitek – monofilamentów w warstwie wewnętrznej dzianiny. Opracowano algorytm obliczeń wyznaczający zależności funkcyjne między siłą ściskającą a ugięciem oraz algorytm określający krzywe odwzorowujące kształt ściskanego pręta. W środowisku programu MathCad dokonano symulacji komputerowej ściskania pręta łączącego dwie zewnętrzne warstwy dzianiny uwzględniając zmienne parametry modelu.

4

Model of the Compressing Process of a One- and Two - Side Fastened Connector of a 3D Distance Knitted Fabric

Supeł B., Mikołajczyk Z.

Fibres & Textiles in Eastern Europe

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2008

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Vol. 16, no. 6 (71)

44--48

EN

A model of the compressing process of a 3D distance knitted fabric was related to a single connector fastened on one side by an articulated joint, as well as fastened on both sides by fixed joints, considering the connector as a slender rod with an assumed shape. The compressing of an elastic rod in the physical and mathematical models was based on assumptions considering the morphology of the knitted fabric as well as the mechanical properties of threads – monofilaments placed in the internal layer of the knitted fabric. Calculation methods and algorithms were developed for the determination of the functional dependencies between the force compressing the knitted fabric and deflection, as well as the description of the curves representing the shape of the compressed rod. A computer simulation of compressing the rod, which connects both outside layers of the knitted fabric, was carried out with the use of the ‘Mathematica’ program, taking into consideration the variable parameters of the model. The considerations carried out in this article are significantly based on our previous publication, and therefore the assumptions of the physical model and detailed descriptions of the analysis are not included.

PL

Model procesu ściskania dzianiny dystansowej 3D odniesiono do pojedynczego łącznika jednostronnie przegubowo zamocowanego oraz obustronnie utwierdzonego, traktując go jako smukły pręt o zadanym kształcie. W modelach fizykalnych i matematycznych ściskanie sprężystego pręta oparto na założeniach uwzględniających zarówno morfologię dzianiny jak i własności mechaniczne nitek – monofilamentów w warstwie wewnętrznej dzianiny. Opracowano algorytmy obliczeń wyznaczający zależności funkcyjne między siłą ściskającą a ugięciem oraz algorytmy określający krzywe odwzorowujące kształt ściskanego pręta. W środowisku programu MathCad dokonano symulacji komputerowej ściskania pręta łączącego dwie zewnętrzne warstwy dzianiny uwzględniając zmienne parametry modelu.