Technical Transactions iss. 11. Civil Engineering iss. 1-B

Technical Transactions iss. 11. Civil Engineering iss. 1-B

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Collection items (11)


Experimentally and analytically based shaping of a built-up compression bar with deformable joints of the branches

Słowiński, Kamil, Wuwer, Walter
Article
2015
This paper presents the course and results of a research programme aimed at the determination of the design buckling resistance of an axially compressed RHS column strengthened using two shorter U-sections. Connections of the tube and the channel branches were fabricated using BOM blind fasteners. Results of the experimental tests demonstrated the satisfactory efficiency of the performed strengthening of the tubular bar. Parametric analyses performed based on the validated theoretical model allowed the identification of the key factors influencing the effectiveness and economic efficiency of the strengthening process.

Selected aspects of the proper application of structural materials in terms of corrosion

Rzeszut, Katarzyna, Szumigała, Maciej, Polus, Łukasz
Article
2015
In this paper, the problem of corrosion in structural elements made of materials which are considered as corrosion resistant is discussed. The paper presents an analysis of the reasons for corrosion damage to structural elements used in civil engineering. The main aim of the work was to identify the potential causes of corrosion and to formulate recommendations that allow the selection of the best structural material properties in order to counteract the negative impact of the corrosive environment. For this purpose, stainless steel ventilation duct corrosion in an indoor swimming pool hall is analysed. An assessment of the nature of the reasons for the potential damage of ventilation ducts is performed based on macroscopic inspection. This allowed the determination of the type and nature of the existing corrosion of stainless steel. The analysis of the results of the chemical composition of the material provided by the gravimetric method and the results of the corrosion products report provided further information. Based on its conclusions, recommendations in order to avoid this type of corrosion in aggressive indoor swimming pool environments are formulated. Next, the problem of corrosion of aluminium in contact with steel in new aluminium and concrete composite structures which consist of an aluminium beam, steel trapezoidal sheeting and a concrete slab is analysed. Moreover, recommendations in order to avoid this type of corrosion are formulated. The presented analyses can be a valuable source of information on corrosion and protection methods in specific cases of building structures.

The loading pattern’s influence on the stress increment in prestressing steel and bending moment resistance in multi-span members post-tensioned with unbonded tendons

Politalski, Wojciech
Article
2015
During the design process of members post-tensioned with unbonded tendons, deformations of the whole structure between anchorages, having impact on ultimate value of prestressing force, shall be considered. The conducted researches enabled the separation of several parameters influencing the stress increase in unbonded tendons – i.a. the loading pattern in multi-span members. This paper presents selected codes provisions and theoretical researches describing this factor. Values received from analytical calculations are shown and compared.

Examples of designing steel shell structures according to Eurocodes

Piekarczyk, Marek, Michałowski, Tomasz, Kowalczyk, Dawid
Article
2015
The paper presents an analysis of the guidelines of the European standards on procedures for the calculation of shell structures. The analysis is illustrated with examples concerning three types of structures of the type i.e.: a chimney, a silo and a tank.

Selected issues of aerodynamics of steel chimneys

Michałowski, Tomasz
Article
2015
This paper presents general principles of managing the reliability of steel chimneys according to Eurocodes EN 1990 and EN 1993-3-2. It discusses the basis for static calculations and dimensioning and compares Eurocode guidelines to the requirements of old Polish Standards. The use of standard procedures is illustrated by an example of static calculations and dimensioning of a steel chimney shell.

Evaluation of the efficiency of construction workers on different days of the week in terms of fuzzy sets

Karcińska, Patrycja, Malara, Jarosław
Article
2015
This paper presents the methodology for comparing previously designated efficiencies of teams of workers using the fuzzy set theory. Efficiency was tested using timekeeping on different days of the week in the execution of specific construction tasks by the same team. The article also presents previously tested factors in this aspect and evaluates the impact of a particular day of the week on resource efficiency.

A comfort comparison of a foam seat against a seat with an auxetic spring skeleton

Janus-Michalska, Małgorzata, Jasińska, Dorota
Article
2015
This paper presents a comfort analysis of two different office chair types. The first is made of foam and the second is comprised of auxetic springs with foam upholstery. Several steps of quasi-static loads are chosen for comfort analysis in order to assess the dependence of measures of comfort on the mechanical properties of the applied structural solutions. Numerical analysis is performed by means of ABAQUS software – this allows the comparison and selection of optimal structures with respect to comfort requirements.

Measurements and calculations of temperature in the ground and in assemblies adjacent to an intermittently heated basement

Gryc, Aleksandra, Radoń, Jan, Nawalany, Grzegorz
Article
2015
Cellars of the main building of the University of Agriculture in Krakow are used as storage areas, laboratories and as classrooms. This article presents the results of many years of temperature measurements in one cellar room; internal and external air temperature as well as temperatures of the walls, the floor and adjacent ground were recorded. In the winter season, the examined room was intermittently heated. Using measured boundary conditions, transient, three-dimensional heat flow in the basement foundation interface was calculated. WUFI®Plus software was used for calculation. By means of statistical analysis, the calculated temperature distribution in assemblies and the ground was then compared with the measurement results. The analysis allowed for the determination of the accuracy of theoretical calculations of thermal conditions in the environment of the periodically heated cellar room.

The sustainable construction industry vs. the final phase life cycle assessments of the internal layer of industrial chimneys

Fiertak, Maria, Stryszewska, Teresa, Kańka, Stanisław
Article
2015
The properties of ceramic construction materials used in industrial facilities are constantly changing during the second Life Cycle Assessment (LCA) phase which relates to the accumulation of harmful substances. These materials are scrapped during subsequent maintenance, upgrade or demolition of the facility and their harmful properties may impact entire ecosystems. This means that the final phase of the LCA in such facilities involves waste products that are difficult to reuse or neutralise due to the polluting effect of the harmful substances they contain. This problem with the final phase of an LCA is highlighted by the example of an industrial chimney in Poland with a height of 160 m. During modernisation, after 30 years of service, the chimney was updated by processes that include the exchange of the thermal insulation of mineral wool and the ceramic liner (made of ordinary bricks bound with cement mortar), which were replaced with foam glass and a liner with acid-resistant bricks layed with silicate putty, respectively.

Distribution of the temperature factor in terms of building envelope protection against mould growth

Boroń, Jacek, Marszałek, Kazimierz
Article
2015
This paper describes the criterion for the protection of building envelopes against the growth of mould. As a criterion for assessing the risk to envelopes, the ƒRsi temperature factor is adopted. The paper provides the resultant temperature factor ƒRsi,max for the critical month in 61 areas in Poland for which typical year-long meteorological data is available on the website of the Ministry of Infrastructure and Development. While calculating the temperature factor, various room humidity classes were taken into account. The results of calculations of the temperature factor fRsi,max have been illustrated with isolines drawn for the whole area of Poland.