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The present paper focuses on the problem of the durability of bent RC beams strengthened with composite materials, subjected to cyclic loading. The theoretical model of determining fatigue life of the cross-section of the bent reinforced concrete beam strengthened with external, non-stressed CFRP strips is presented. The author's own propos al is to introduce the coefficient ofthe strip position effect...
This paper presents the results of thermovision temperature measurement in the contact zone of grinding wheel and workpiece during single-pass internal cylindrical grinding process. Such a kinematic form of grinding process is characterized by very difficult machining conditions. In order to control grinding temperature in this process, the authors developed a special measurement method which enables...
A segment of a gravel column, I m high and 0.53 m in diameter, was modelled in a calibration chamber. The reconstituted sample was consolidated at a given confining pressure and then subjected to wdalload exerted by the upper and lower membranes. Volumetric changes in both membranes and in internal chamber were measured. Up to 2% vertical strain was reached and internal friction angle was evaluated...
The paper presents the method of analyzing static work of support zones in concrete composite structures. This method is based on MCFT (Modified Compression Field Theory). WhiJe designing composite beams, the author allows only such cases, where the appearance of the interface crack is precluded by the diagonal crack. The case of support zones with diagonal cracks and locally cracked interface has...
The paper presents the role of a bond layer in the repair process of concrete and reinforced concrete elements as well as the place of its laying. For the purpose of a detailed analysis of the above problems two series of tests were carried out. In the first series of the tests, the influence of the state of the surface under repair (wet, oiled) on the adhesion ofthe bond layer is taken into account...
The causes of failures in contemporary automatic diagnostic systems working with use of neural networks in industrial conditions are given. lt has been stated that one of the basic causes was the lack of opportunity to perform logical operations by the artificial neuron model of McCulloch and Pius which makes the core of artificial neural networks programs. A new method of data gathering and initial...
The problem of fitting the characteristic of the universal machine tool's main drive to anticipated machining tasks is considered. The power demand and the cutting torque demand for tuming and milling are analysed. It is shown that by employing a multiplying gear one can obtain a constant machining power in a wide range of spindle speeds whereby both steel and aluminium alloys can be efficiently machined.
Depending on fire duration, fire temperature (reaching several hundred degrees centigrade) leads to a damage (in varying degrees) to concrete. A structural damage assessment based on an inspection is highly unreliable, particularly when concrete heated up during a fire was rapidly cooled down with cold fire-fighting water. Because of this thermal shock the surface of concrete cracks heavily. The load-bearing...
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