Two roof structures made of timber trusses collapsed during the winter in 2005. Employees of the Department of Steel and Timber Structures at SUT in Bratislava performed a detailed diagnostic inspections of 16 sites roofed by mentioned type of timber trusses in Slovakia.

This paper is based on the results of theoretical, implementation and realization work of load-bearing systems for timber frame houses. The paper contains the conclusions from designing and realization of some selected structures especially of the mountain hotel which is being built in the Krkonoše Mountains (Czech Republic).

Rating of LEED has clearly favored FSC certification (Forest Stewardship Council) over the other, let's say competing types of national and international certification of wood. Critics point to the FSC for example, that in principle there is no clearly identified reason for the creation of an evaluation standard.

The object of this work is a numerical analysis of the behavior of wood-concrete composite ceiling structure, consisting of concrete slab and wooden beams of glued laminated timber. The main objective is to explore the use of concrete slabs, which assists with wooden beams, and using models in ANSYS to investigate its behavior in the load floor construction. The accuracy of numerical analysis of wood-concrete structure fully depends on the material models. Therefore the material models will be later verified by experimental results.

In addressing the fire safety of buildings it is necessary to know the value of fire resistance of building products and constructions of building and to design constructions, which meet required fire resistance values. It is necessary to distinguish two categories of elements: building products and construction.

Determination of the development of fire in the compartment with subsequent detection of temperature in different parts of the structure requires knowledge of many parameters. The most important step is to determine the design fire scenario that matches the extraordinary fire situation best. The design of fire can describe the temperatures in the fire department and determine the heat transfer in structure. Let's look at several models and the thermal and mechanical load of structures.

Thermal insulation of prefabricated panel buildings is shifting to residential houses built on a brick in at the end of the 19th century and the beginning of the 20th century. These houses usually have an unheated basement with brick arches or wooden beam ceiling. Insulation of envelope and leaving the original heating system leads to a change in the internal climate and causing secondary faults.

Fire engineering is a way to define the requirements of fire safety at risk, complex and unusual structures. It consists in a specific risk assessment of fire safety conditions in a different ways from those of the procedure prescribed in Czech technical standards under § 99 of Act No. 133/1985 Coll. for fire protection. Notes on the standards will be presented in three parts. Part Three: Another standards.

The paper deals with optimizing the thickness and material of the reinforcing plates used for beams of glued laminated timber. It was first mapped in detail twenty unreinforced beams of glued laminated timber, where the great attention paid to accurately determine the elastic modulus in the direction of fibers of individual segments of blades and their localization in the beam.

Fire engineering is a way to define the requirements of fire safety at risk, complex and unusual structures. It consists in a specific risk assessment of fire safety conditions in a different ways from those of the procedure prescribed in Czech technical standards under § 99 of Act No. 133/1985 Coll. for fire protection. Notes on the standards will be presented in three parts. Part Two: Industrial buildings.

Timber trusses with punched metal plate fasteners are designed as plane structures loaded only in their plane. Actions applied perpendicularly to the truss plane must be transferred by engineered bracing system. Correct design of the bracing system is considered to be one of the essential conditions providing required reliability of the whole roof structure. The CTU in Prague, Faculty of Civil Engineering, Department of Steel and Timber Structures in cooperation with company Vazníky D.N.K. s.r.o. have performed load tests of three different types of engineered bracing truss structures. The aim of the tests was to describe behaviour of the specimen under horizontal load. Numerical model of two common types of bracing frames and a model of a whole roof consisting of 10 timber trusses was made to verify the results obtained from the experiment.

Wooden-concrete ceilings are used especially in strengthening the existing ceilings with wooden ceiling beams. They have great potential also as precast concrete ceilings of multi-storey wooden buildings. They significantly increase the stiffness and resistance of the ceiling structure. Wood-concrete ceiling structure parameters are also better in the field of impact and airborne sound insulation and fire resistance, more than traditional wooden ceilings.

Fire engineering is a way to define the requirements of fire safety at risk, complex and unusual structures. It consists in a specific risk assessment of fire safety conditions in a different ways from those of the procedure prescribed in Czech technical standards under § 99 of Act No. 133/1985 Coll. for fire protection. Notes on the standards will be presented in three parts. Part One: Non-industrial buildings.

The cooperation of all the creative team from the initial moments of project activity ensures proper and efficient solution to fire safety of building. Proof of fire resistance of buildings by calculation is vital need. If designer use computer software, then he is required to verify and prove their suitability for a particular case.

Quality of fire protection is achieved by appropriate education and training, research, investment in technical solutions and equipment of buildings, legislation, standards and work of professional and volunteer fire brigades. The Czech Republic in the European and global statistical comparisons, long been high on the success of fire protection of persons and property. The article is important summary of the options in the fire resistance design of structures in the national regulations.

The article deals with substandard structures structures. Assessment is complemented by practical examples and explanations of operational implications especially with regard to the durability of structures. These proposals should be applied as part of fire safety design of buildings.

The article is focused on the reconstruction of traditional timber joist ceilings with an additionally cast concrete slab. At Faculty of Civil Engineering in Brno conducted experimental work aimed at the analysis and behaviour of composite slab structures. Huge attention was put also on the separation of the concrete from the timber parts of the structure with the help of foils (separation layer) to prevent the movement of moisture from the concrete mixture to the timber elements. Therefore the increase in water content within the wood was also observed during the experimental part of the research together with the effects of the separating film to the characteristic of the coupled elements - coupling slip modulus K [N/mm].

The paper describes existing databases of environmental data of building products with focus on Czech tool Envimat.cz. It is an online tool, which provides environmental indicators of building materials with main purpose of providing a unified, transparent and reliable system that allows user to compare different products and structures; motivate the producers to fill in data sets of their products and improve their technologies; convince architects and designers to care about different sustainability profiles of materials; give advantage to products that have lower environmental impacts being at the same technical level than the competitor. The implementation of Envimat is divided into the three main phases: start-up phase (data from the generic database); transitional phase (combination of generic and localized data); regular operation with fully localized data.

The article is devoted to research on the influence of the separation layer wood-concrete floor structures. Using the separation layer is justified especially in the case of reconstruction of historically valuable floor structures, such as a painted deck or beams, where water during the casting technology may cause damage, or even in the case of concrete applications with a high coefficient of water, where excessive moisture could adversely affect the mechanical properties of wood.
According to the results of the experiments we can say that in the application of concrete with a water factor approximately 0.4, it is not necessary to use concrete structure interlayer separation between concrete and formwork. Using foil separation negatively affects stress coupling elements, and thus the entire composite structure.

Clay bricks are one of the most common material used mainly in the contruction of residential buildings. We can say that masonry is a kind of standard of building design, as all other materials are being compared with brick masonry. Few years ago, there were only full bricks. In connection with the development requierements of heat transfer coefficient of the wall, the structure of the bricks is changing. Currently avaliable bricks are suitable for one-layer masonry of passive houses. The article presents an overview of the development of bricks and outlook for the future.