Теорія і практика будівництва. – 2007. – №600
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Вісник Національного університету «Львівська політехніка»
У Віснику опубліковано результати закінчених науково-дослідних робіт професорсько-викладацького складу Інституту будівництва та інженерії довкілля Національного університету «Львівська політехніка», українських та зарубіжних науковців.
Вісник Національного університету «Львівська політехніка» : [збірник наукових праць] / Міністерство освіти і науки України, Національний університет «Львівська політехніка». – Львів : Видавництво Національного університету «Львівська політехніка», 2007. – № 600 : Теорія і практика будівництва / відповідальний редактор З. Я. Бліхарський. – 583 с. : іл.
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Item Abilities of energy consumption rationalization in individual boiler in educational buildings(Видавництво Національного університету «Львівська політехніка», 2007) Lis, P.The paper presents the results of investigations on abilities of energy consumption rationalization in individual boiler in educational buildings. Central heating is a system consisting of two main elements: heat source and central heating installation. The basic parameter in evaluation of central heating boilers is nominal n and useful u efficiency of heat production. The greater the efficiency of the central heating boiler, the less fuel should be used to produce a certain amount of heat. Differences in this case are considerable, which also influences energy consumption and costs of heating the building.Item Analiza korelacji miedzy parametrami morfologii powierzchni przełomów betonów(Видавництво Національного університету «Львівська політехніка», 2007) Konkol, J.; Prokopski, G.In article the results of investigations of fracture surfaces of concrete has been shown. Determined the profile lines development factor RL and the fracture surfaces development factor RS, versus composition of concretes as well as the dependence between fractal dimension D and parameters RL and RS. The existence statistical correlation between fractal dimension D and these parameters has been shown too. With growth the both fractographical parameters (RL and RS) enlarged oneself also the value of fractal dimension.Item Analiza zmian entropii w obiegach sprezarkowych pomp ciepła(Видавництво Національного університету «Львівська політехніка», 2007) Pisarev, V.; Sałacinski, B.The paper contains an analysis of compressor heat pumps cycles. From the point of view of enthalpy changes in a refrigerant compression process and heat exchange between refrigerant and heat carrier, an influence of inserting a second condenser in the cycle was examined.Item Analysis of the steel joint with four bolts in the row(Видавництво Національного університету «Львівська політехніка», 2007) Pisarek, Z.; Kozłowski, A.In unbraced steel frame structures, bolted extended end-plate moment connections with four bolts in the row are very often applied. In this article a different methods are presented for the calculation of beam - to - column joints with four bolts in each row. The component method is recently the most popular method for the estimation of the moment capacity, initial stiffness, and rotation capacity of the steel and composite joints. This method has been recently largely developed, but still the resistance and stiffness of some components are not evaluated. This mainly regards the T-stubs with four bolts. An analytical model for T-stub with four bolts, which can be used for prediction of the joint resistance and initial stiffness has been elaborated.Item Diminishing of legionella infection risk in hot water supply(Видавництво Національного університету «Львівська політехніка», 2007) Vranayova, Z.; Kosicanova, D.; Ocipova, D.The presence of Legionella pneumophila in hot and cold water systems inside any building is to be expected. Hotels and hospitals abroad, particularly those located in old buildings, represent a major source of risk for Legionnaires' disease due to the high frequency of Legionella contamination. The most vulnerable individuals are normally the elderly, or those already weakened by sickness or disease. The subject of the paper is our investigation Legionella contamination of hot water in a cross-sectional survey in Kosice, the second biggest city of the Slovak republic.Item Equivalent standard axle loads analysis on lithuanian arterial highways(Видавництво Національного університету «Львівська політехніка», 2007) Šukevicius, Š.As the flows of vehicles, especially heavy goods vehicles are growing on the roads of Lithuania, the remaining deformations of the pavements are appearing and progressing also cracks originate because of low pavement strength. The biggest loads are caused by heavy goods vehicles, which total number increases 17% annually. This paper presents analysis of the damage caused by transport vehicles axle loads to the asphalt pavement roads. This influence estimated through calculation equivalent standard axle load index.Item Factors influenced on heat gains and heat losses in buildings(Видавництво Національного університету «Львівська політехніка», 2007) Lis, A.The paper presents the results of investigations on building’s heat gains and heat losses. The heat balance conditions in selected buildings were observed. The factors, which influence heat gains and heat losses in analysed building were identified. The changes of value of these quantities on the influence of individual factors were estimated.Item Hot water distribution system - interrupted operation(Видавництво Національного університету «Львівська політехніка», 2007) Kapalo, P.At the actual increase price energy is endearor cut-down energy requirement preparation and distribution hot water (HW). In paper are present result exploration, where been evaluation effect interrupted operations distribution systems HW flat building.Item Identification of the noise sources in a steel railway bridge(Видавництво Національного університету «Львівська політехніка», 2007) Janas, L.This paper presents the results of a noise study in the areas surrounding a railway line and a bridge, in a large municipal agglomeration. Sound characteristics were determined in the one-third octave bands and narrow frequency bands, and bridge vibration studies were carried out. The relationships between the vibrations of some elements of the structure and the acoustic pressure in its environment were revealed by applying a coherence function. The sources of excessive noise emissions to the surrounding environment were identified, and solutions for modernizing the railway infrastructure of the region were proposed.Item Impact resistance of sfrm modified by varied superplasticizers(Видавництво Національного університету «Львівська політехніка», 2007) Katzer, J.; Kobaka, J.The paper presents results of examinations of steel fiber reinforced mortar (SFRM) modified by superplasticizers based on different chemical substances. The described SFRM were made on the basis of fine aggregate cement matrix modified by the addition of hooked steel fibers. The examination was a drop-weight test. Results allowed to specify influence of the specific superplasticizer on SFRM dynamic features.Item Investigation of stiffness of cable and W-form road guardrails(Видавництво Національного університету «Львівська політехніка», 2007) Prentkovskis, O.; Dabulevicien, L.; Prentkovskien, R.; Bogdevicius, M.; Blož, V.Item Large panel housing building in europe problems and solutions(Видавництво Національного університету «Львівська політехніка», 2007) Plewako, Z.Paper deals west European countries experiences related to existing multi dwelling building stock made of large panel technology in second half of last century. The actual problems and applied technical solutions are presented. Though for east Europe discussed problems partially are not important now, in coming years could be more significant, and the proposed solutions might become useful.Item Mechanical properties and physico-chemical aspects of concrete after cooling from high temperatures(Видавництво Національного університету «Львівська політехніка», 2007) Varga, T.In the presented paper, changes of some mechanical properties of concrete after cooling from high temperatures are compared. Tested concrete was prepared according to the same composition, while only the mineral composition of aggregate was changed, which was andesite, dolomite or river gravel. Availability of various aggregate kind was purposed by comparison of mechanical properties of concrete.Item Methods for environmental assessment of building materials(Видавництво Національного університету «Львівська політехніка», 2007) Eštoková, A.A building is an artificial environment designed and built to meet user need and material is the most basic product of building production. Building products so directly or indirectly interact with the environment. The main environmental evaluation methods as well as the simple example of environmental assessment of selected building material are presented in this paper.Item Metody badan i kryteria zgodnosci dla włókien do betonu – doswiadczenia z badan laboratoryjnych(Видавництво Національного університету «Львівська політехніка», 2007) Józwiak, H.Specifications, test methods and conformity criteria for steel and polymer fibres for concrete containing in European Standards were described. Test results doing as an Initial Type Testing in laboratories of Building Research Institute were shown. It was found, that for investigated steel fibres strength requirements are performed for lower dosage than range indicated by manufacturer. In the case of polymer fibres requirements fulfilling maximum dosage demanded.Item Nádrž, kvapalina a podložie(Видавництво Національного університету «Львівська політехніка», 2007) Kotrasová, K.This article contains description of some methods for solution of response of vertical rectangular containment with fluid on the soil, which is subject to horizontal seismic loads. First part of the present article consideres impulsive and convective components of the fluid with various dynamic behaviours. The special method of calculation of response of containment is described in further part of the paper. Computer-program Cosmos/M was used.Item Ocena zgodnosci własciwosci betonu(Видавництво Національного університету «Львівська політехніка», 2007) Wolinski, Sz.The subject of this paper are methods and criteria of conformity for the ready mixed concrete properties. Using the Monte Carlo simulation method sampling plans recommended in codes, based upon the acceptable quality level (AQL) and statistical criteria have been analyzed. The analyses show that in cases of small sample sizes these criteria can produce an undesired effects to the both producer and contractor. An approach based on assessing the risk of producer and contractor is also discussed in the paper.Item On the problem of safety evaluation in design of steel members for accidental fire situation(Видавництво Національного університету «Львівська політехніка», 2007) Maslak, M.; Domanski, T.Failure probability can be applied as a basic safety measure in design of structural member under fire conditions. To reliable assess this value interacted influences of many factors should be taken into account. Some suggestions in this field are given in this paper.Item On time-dependent reliability of sustainable structures(Видавництво Національного університету «Львівська політехніка», 2007) Juocevicius, V.; Kudzys, A.Peculiarities of sustainable reliability predictions for load-carrying structures of buildings, construction and civil engineering works are discussed. The quantitative probabilistic parameters of the structural safety and durability of members and their systems are formulated and applied. A new strategy for probability-based quality predictions of sustainable structures is presented. The safety prediction is meant for particular members (sections, connections) exposed to action effects. Contrary to this prediction, the durability issues for whole structural members (slabs, beams, columns, walls) as auto-systems representing their multi-criteria failure mode are considered. The methods of conventional resistance and transformed conditional probability design in practical calculations of reliability parameters of sustainable structures and works are presented. It is recommended to calibrate the target reliability index of sustainable structures considering not only the consequences of failure of the members but also their functional working classes.Item Porowatosc betonu wyznaczona metodami stereologicznymi oraz jej wpływ na własciwosci mechaniczne betonu(Видавництво Національного університету «Львівська політехніка», 2007) Konkol, J.; Tomasik, A.In this article introduced results of experimental research of air void of concrete from use the parameters the stereological by the computer programme FRAKTAL_Stereolog. The subject of research was to examine the influence of water-cement ratio in concrete mixture on durability properties of natural gravel concrete in view of fracture mechanics too. Existence of relationship between the composition, the structure and properties of the tested concrete has been proved on the basis of the executed research.