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Archiv článků od 15.10.2012 do 18.3.2013

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18.3.2013
Prof. Ing. Leonard Hobst, CSc., Ing. et Ing. Petr Bílek, prof. Ing. Jiří Vala, CSc., doc. Ing. Jan Vodička , CSc.

The paper deals with the development of the magnetic method using permanent magnets for monitoring the distribution of fibers in hardened steel fiber-concrete structures and comparative measurements on test samples.

18.3.2013
doc. Ing. Petr Kuklík, CSc., Ing. Hana Hasníková

This paper deals with methods for determining the reliability of historical wooden structures and tries to outline the progress and shift in the methods used, problems or gaps in knowledge and research needs associated with this activity.

11.3.2013
Ing. Věra Heřmánková, Ph.D., Ing. Ondřej Anton, Ph.D., Ing. Petr Cikrle, Ph.D., Ing. Michal Stehlík, Ph.D.

Wood is an organic material and therefore often considered to have a short lifetime. However, in the past, people did not distinguish between durability of wood and durability of masonry, proof of which is the existence of constructions that combine the use of both. In fact, the lifetime of wood can be high if specific rules are followed when designing the construction.

11.3.2013
doc. Dr. Ing. Luboš Podolka, Fakulta stavební ČVUT v Praze, katedra betonových a zděných konstrukcí

This paper describes the method for calculating the amplification of curved brick construction with composite reinforcement and compares this procedure with reinforcement made by conventional methods to gain a practical demonstration of the bent beam.

4.3.2013
Ing. Michal Kloiber, Ph.D., Ing. Jan Tippner, Ph.D., Ing. Jaroslav Hrivnák

This paper presents an analysis of the behaviour of wood when using the diagnostic tool for "in-situ" assessment of wood based on the principle of mechanical resistance to penetration tool (mandrel) into the wood. The aim was to describe the degree of deformation and failure mode during penetration (diameter 2.5 mm) into wood in a purely radial direction and to compare the tool with a standard measurement unit testing on samples.

25.2.2013
Doc. Ing. Jaroslav Solař, Ph.D., VŠB TU Ostrava

Wood-destroying insects is one of the biological wood pests. Attacks the wood material, both individually and also in parallel with other decaying biological pests. Knowledge of principles for the design and implementation of a hot air disposal of wood-destroying insects is necessary for the reconstruction of historic buildings. Carefull consider from a conceptual point of view is necessary for the design for redevelopment of wooden elements affected by wood-destroying insects.

Možnosti využití pálených jílů ve vápenných maltách
11.2.2013
prof. RNDr. Pavla Rovnaníková, CSc., Ing. Eva Navrátilová, Bc. Ludmila Šmerdová

This paper deals with the influence of addition of fine-grained ceramic body which was added to the lime mortars in the amount of 0–50 % of the binder weight. The addition effect of the fine-grained ceramic body on the properties of the modified lime mortars was evaluated on base of the strength and absorbency characteristics of the modified lime plasters. The ceramic body was analyzed prior to its use in the mortars. Pozzolanic activity and mineralogical composition were determined. The results showed that the addition of the ceramic body in the modified lime plasters had positive influence on their properties. The strenghts of the modified lime plasters were increased and the absorbency was reduced.

14.1.2013
Ing. Ondřej Anton, Ph.D., Ing. Petr Cikrle, Ph.D., Ing. Věra Heřmánková, Ph.D.

Relatively frequent request when conducting construction surveys of historical constructions is to determine the origin and age of bricks as well as their physico-mechanical properties in the context of a static evaluation of the brickwork. This article addresses this issue using an example of historic brickwork in a bridge construction.

Co přinese novela stavebního zákona do praxe
7.1.2013
Ing. František Konečný, Katedra stavebnictví, Vysoká škola technická a ekonomická v Českých Budějovicích

An amendment of the Building Act will bring many changes to developers and building offices. Procedures of the Building Act will be simplified in a lot of cases. Some parts of the Building Act are modified in detail. This amendment has been published in the Collection of Laws under No. 350/2012 Coll .. and it will be effective from January 1, 2013.

Bílé vany
31.12.2012
Ing. Jiří Pazderka, Ph.D., Katedra konstrukcí pozemních staveb, Stavební fakulta, ČVUT v Praze

The article describes unbiased comparison between two different methods of building protection against subsurface water and moisture – the foundation structure of waterproof concrete and waterproofing envelope based on the bitumen or plastic continuous sheet water proofing. The confrontation of properties and risk factors of the methods is made from the perspective of waterproof concrete structure which is the main content of the article. The comparative analysis is supplemented with the photos from field surveys and the results of independent laboratory tests.

31.12.2012
doc. Ing. Václav Kupilík, CSc., Katedra konstrukcí pozemních staveb, Fakulta stavební ČVUT v Praze

Explosion effects belong to the category of accidental actions. During the use of building or during its construction may occur only exceptionally. ČSN EN 1991‑1‑7 (73 0035) requires to consider this type of actions and the solution of structural design to withstand the accidental action.

17.12.2012
Ing. Zlata Kadlecová, prof. Ing. Jiří Adámek, CSc., Ing. Petra Hronová

This paper deals with the quality of work performed concrete structures and acquaints readers with a quick method to verify the quality of the surface layer of concrete. The method indirectly points to the durability of the resulting concrete structure and the quality of work performed.

10.12.2012
Ing. Luboš Taranza, Ing. Vladimír Tichomirov, CSc., Ing. Lenka Bodnárová, Ph.D., prof. Ing. Rostislav Drochytka, CSc.

Cracks in industrial concrete floors with top layer of mineral granules are quite common. Their evaluation depends largely on the subjective opinion of the assessors. It is not the exception that the cracks appear after a longer time in the order of weeks to months after the construction. At the time up to three years after construction there is a tendency of their expansion. Cracks have a major impact on the life of industrial concrete floors.

3.12.2012
Dipl. Ing. Dr. techn. Manfred Augustin, doc. Ing. Jaroslav Sandanus, PhD.

Cross laminated timber is likely to happen in the near future, the most important product in solid wood construction in residential and high-rise construction. Depending on the size of the used components and their mutual orientation can produce a wide range of products.

26.11.2012
Ing. Roman Brzoň, Ing. Milan Ostrý, Ph.D.

This paper deals with the issue of comparing simulations for steady and unsteady thermal state at the massive structures. In this paper, computer simulations are compared with real measurements and measurements of climatic data. The evaluation showed that the steady-state temperature can be comparing with real model used after the end of the accumulation phase. It is evident that the requirements for the temperature factor of the internal surface of the solid structures, set by legislation, are a safe assumption.

Křížem lepené dřevo
26.11.2012
Dipl.Ing. Dr. techn. Manfred Augustin, doc. Ing. Jaroslav Sandanus, PhD., Katedra kovových a drevených konštrukcií SvF STU v Bratislave

Cross laminated timber is likely to happen in the near future, the most important product in solid wood construction in residential and high-rise construction. Depending on the size of the used components and their mutual orientation can produce a wide range of products.

5.11.2012
doc. Ing. Tomáš Rotter, CSc., Fakulta stavební ČVUT v Praze

Standards for the building of steel structures in recent years undergone a similar development as the standards for the design of steel structures. System of the Czech standards was supplemented by EN 1090 standard, that became CSN EN 1090. Subsequently, duplicate Czech standards were repealed and replaced by the so-called residual standards, which include provisions that were in the original Czech standards but are not in the standard European.

29.10.2012
Ing. Slavomír Entler

Video Image Fire Detection is a modern fire detection mechanism of phenomena and processes accompanying fire. Main advantage is the ability and speed of smoke detection, independent of the arrival of the smoke to the sensor. Video Image Fire Detection can achieve higher sensitivity than conventional fire sensors by simultaneously monitoring different parameters in a large area. The article gives basic requirements for Video Image Fire Detector for Automatic Fire Alarm Signaling.

15.10.2012
Ing. Michal Papranec, Ing. David Bečkovský, Ph.D.

The behaviour of real structures in some cases differs from the structure modeled in computational program. Article deals with the influences that can affect the characteristics of the structure, so that they affect the surface temperature of the structure. In particular, the moisture inside the material and air humidity.

dřevostavby
15.10.2012
doc. Ing. Petr Kuklík, CSc., Ing. Magdaléna Dufková

Development of wooden buildings in the Czech Republic is based on the requirement to implement the most low-energy buildings. Still there are many people who are afraid of wooden buildings mainly because of their misconceptions about their behaviour under fire. But the truth is that in a fire wood doesn’t lose its rigidity and strength, and the remaining sections of wood elements are also able to carry the load.


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