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The analysis of safety of composite prestressed concrete bridges in terms of cracking is presented. The analysis of the standard-based requirements was carried out. The assessment of safety is based on Cornell’s reliability index taking into consideration two random factors: the tensile strength of concrete and the values of normal stresses at the bottom edge of girder. As random variables which affect...
The methodology of determination of strain-rate sensitivity index was developed based on rolling of a set of samples with the same draught but different speed at a defined temperature. It was shown that an initial grain size has nearly negligible influence on the variable investigated, in contrast to phase compo-sition whose influence is considerable.
The P/M low-alloy steel with sintered density of 7.0 g/cm3 was surface hardened by means of vacuum carburizing method. The fatigue strength of steel in case-hardened and sintered state was determined. Fatigue tests were conducted in the axial loading mode (R = –1, f = 25 Hz) on unnotched specimens. Comparing the S–N curves obtained for case-hardened and sintered specimens, the influence of vacuum...
Spring-back is the main defect of the U-shaped parts. After removal of tools, the U-shaped part undergoes significant modification of the angles between the bottom, the sidewall and the flange, and also a curvature of the sidewall appears. The blankholder force is an important factor in controlling the size of spring-back parameters. The present paper is an experimental study of how blankholder force...
This paper presents the MANPRESS robot: a simple, low-cost and newly developed industrial device primarily devoted to press feeding. This robot exhibits two major features: great flexibility to accommo-date different machines and products, and optimal performance in loading/unloading one or more machines. The first is due to the usage of modular, off-the-shelf and easy to control system components...
Algorithms using wavelet-packet bases for solving initial-value problems described by systems of linear differential equations with constant or variable coefficients have been demonstrated. Algorithms which use expansions of the derivative of state variables and expansions of the state variables in any wavelet-packet basis were described and compared. The results of the analyses were compared with...
Reliability of bridge beams with hybrid cross-sections is considered. The beams made of elastoplastic material and loaded quasistatically are regarded as failure-free. Dead load and the load caused by a tram described by random variables are taken into account. Furthermore, material capacity and the dimensions of the cross-sections are also described by random values. In order to calculate the reliability...
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