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    Cast Screws as Shear Anchors for Composite Slabs
    (Elsevier, 2017-07-20) Holomek, Josef; Bajer, Miroslav; Vild, Martin
    Composite slabs consist of trapezoidal steel sheeting and concrete cover. The steel sheeting serves as both, a lost framework and a tension bearing member after hardening of concrete. The longitudinal shear between the sheeting and the concrete must be ensured by a mechanical interlock, for example shear studs or prepressed embossments in the sheeting. The traditional massive shear studs have to be welded to the supporting construction of the slab. Alternatively, thin screws can be drilled through the sheeting and cast into the concrete to ensure the composite action or to strengthen the composite slab in reconstructions locally. The usage of the screws is not limited to the steel supporting frames. This paper describes laboratory tests of the composite slabs with cast screws of various diameters and the effect of the screws on the bending capacity of the slab in combination with prepressed embossments.
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    Kvalita koleje v průběhu času
    (ECON publishing, s.r.o., 2018-01-25) Dušek, Erik
    Článek se zabývá možnostmi zkoumání vývoje kvality koleje v průběhu času. Kvalita koleje se hodnotí podle hodnot jednotlivých geometrických parametrů koleje. Kolej se hodnotí buď úsekově, nebo lokálně. Při lokálním způsobu hodnocení se hledají potenciální problematická místa, zatímco v úsekovém jde o posuzování částí železniční trati, které posléze slouží k plánování údržbových prací. Podrobné zkoumání trendu kvality koleje a následné vyhodnocování získaných dat pomáhá k ekonomickému využívání prostředků na udržování železniční sítě. Součástí článku je i prvotní vyhodnocení dat ze zkušebního úseku.
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    Fatigue Resistance and Durability of New Mechanical Connections of Currently Developed Temporary Steel Footbridges and Railway Bridges
    (Elsevier, 2015-09-01) Karmazínová, Marcela; Melcher, Jindřich
    On the workplace of paper authors, the experimental studies of the fatigue behaviour and fatigue resistance of several new types of steel mechanical connections have been performed recently. The problems of mechanical connections mentioned above have been solved in the past within the projects of the development of new types of advanced temporary steel bridges and footbridges, with the support of the programme of applied research, development and innovations of the Technology Agency of the Czech Republic. These newly developed connections represent the assembly joints based on the bolts and pins together with plates. Within this investigation, fatigue tests of connections have been performed. The experimental studies have been oriented to the verification of the behaviour of those connections and especially, the fatigue strength, and subsequently the fatigue resistance and durability of the structural detail according to the configuration and structural design.
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    Quality of the Track Geometry Progress
    (TECHNICAL UNIVERSITY OF KOŠICE, 2018-04-26) Dušek, Erik
    Track geometry tends to deteriorate over time under the influence of traffic load. This means that the track tamping needs to be carried out when the track geometry exceeds defined limits. Better understanding of this process is essential basis for efficient maintenance and renewal ensured by periodical measurements of the railway network, subsequent data evaluation and life-cycle cost analysis. Evaluation of the quality of track geometry is based on certain variables calculated for short sections of the track. The aim of the paper is to present a way to accurately rank quality of the track geometry using mathematical statistics and furthermore to be able to predict the progress of the track quality via regression analysis. These methods could be also utilized to help understand processes occurring in the railway substructure and superstructure.
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    Conditional Stability and Asymptotic Behavior of Solutions of Weakly Delayed Linear Discrete Systems in R^2
    (Hindawi, 2017-06-12) Diblík, Josef; Boháčková, Hana; Šafařík, Jan
    Two-dimensional linear discrete systems $$ x(k+1)=Ax(k)+\sum\limits_{l=1}^{n}B_{l}x_{l}(k-m_{l}),\,\,\,k\ge 0 $$are analyzed, where $m_{1}, m_{2},\dots, m_{n}$ are constant integer delays, $0