Applied Mechanics and Materials Vol. 820

Abstract: The article presents possible procedure for determining parameters of a building representing a finite group of buildings of the same properties characterized in particular by their size and amount of combustible material (family house furnishings, manufacturing facilities, etc.) that are potentially threatened by overhead electric power transmission lines. Detailed statistical processing was used to find dimensions of these buildings such as length, width, and height and their distance from transmission line conductors, which the first step is preceding subsequent mathematical modeling of a representative building and simulation of a fire in it.

Abstract: This paper presents a numerical investigation of water supply for cooling tertiary containment wall. These type of tanks are used as a part of petroleum high storage tank. Minimum quantity reasonably needed is perform by heat – balance equation. The calculation in is done for the most heat stressed wall part for a case when neighbouring tank is on fire.

Abstract: The paper deals with the solution of interconnections of flue and combustible construction products in the fire safety design. It is focused mainly on a prescribed value of safe distance of the wooden building construction from a single-walled metal chimneys. The aim of article is to point out the necessity to solve the contradictory requirements in the Slovak legislation and inconsistency with the foreign regulations in terms of fire rates caused by chimneys and flues.

Abstract: Escape route in the building is the fundamental prerequisite of safe escape in the part of building, or in the whole building. The personnel get away using the escape routes of different quality. The start point of escape is usually on unprotected escape routes that ideally flow directly to exterior. If it is not possible to eventuate the unprotected escape route directly to free exterior, it must open up into higher quality escape route. That means the persons go to partly-protected escape route or to protected escape route. The dimensions of escape route must verify at least required base typological demands, outgoing from real dimensions of the human body and must also make provision for barriers on them.

Abstract: The primary objective of daylighting measurements, by means of physical models, is the experimental finding of daylight conditions in the interior (in case of scale model of a specific room), or their impact on the surrounding buildings (in case of models of whole buildings). If these measurements are carried out even at the early stage of the building design, they can be very helpful in revealing gross deficiencies of the design or optimization of window apertures. According to the purpose of the measurement, physical models can be placed either on site of the future building – which advantage is the possibility of a reliable reproduction of the actual shading conditions, respectively the amount of reflected light by the envelop of existing buildings – or in laboratory, under artificial sky. The advantage of measurements using artificial skies is mainly the possibility to imitate the conditions of CIE overcast sky, thus the disadvantages of the variability of natural daylight are eliminated, while there is also a potentiality to optimize different solutions at the same boundary conditions. On the other hand, if the luminance distribution of the artificial sky is does not correspond with the theoretical luminance distribution of CIE overcast sky, the results of the measurements can be incorrect. The aim of this contribution is to illustrate through a case study, the importance of ensuring the appropriate boundary conditions at scale model measurements.

Abstract: Extraordinary occurrence of the solar eclipse offers opportunity to evaluate spectral characteristic changes and intensities of daylighting during its various phases. Changes of the daylight spectrum in positions: zenith and 45° above horizon with orientation of sensors opposite to sun position were measured. Changes of horizontal illuminance and luminance as well as changes of the correlated colour temperature in the range of the Planck curve were measured in Bratislava and evaluated. Paper presents results of experimental measurements and discusses in point of view of sunlight characteristic’s changes as source of daylighting.

Abstract: Solving building acoustic of structures leads to a requirement to know behavior of dynamically loaded structures. Often used design is a window, that glass pane can be modeled as board. When measuring acoustic qualities of windows, monitored value is frequency of excited sound as a sound pressure. From solutions of dynamically loaded structures is known fact that when excited frequency of load is equal, or approximately equal to its natural frequency, there is an unwanted resonance phenomenon.

Abstract: Development of modular transparent elemental façade. Laboratory experimental verification of a façade panel and optimization of its acoustic parameters. Measured samples. Laboratory equipment. Methodology of measurement. Results and conclusions of laboratory experiment.

Abstract: The contribution deals with a comparison of measured and calculated values of sound reduction index R (dB) and weighted sound reduction index R_w (dB) of simple walls from various materials. In this way it verifies the exactness of a modified calculation-graphic method according to Watters and an appropriateness of its application for simple walls from various materials with the focus on the aerated concrete walls.

Abstract: The contribution presents a mathematical modification of Watters’ formula used in modified Watters’ method. This formula expresses a dependence of sound reduction index on surface mass (mass law). On the basis of the previous research which resulted in the finding that the Watters’ method do not give acceptable results for simple walls from aerated concrete, the mentioned formula was modified to be usable for theoretical determination of sound reduction index of simple aerated concrete walls. The contribution also presents a modification of this formula for calculation of sound reduction index of simple aerated concrete walls with a plaster on both sides.