The article introduces the new method “Lapped Scarf Joints for Historical Structures Repairs” that deals with design of the lapped scarf joint suitable for the reconstruction of valuable historical timber structures, with help of making the prosthesis for the damaged parts of the beams. The method is a result of the four-year research project supported by the Czech Ministry of Culture within NAKI program. Institute of Theoretical and Applied Mechanics AS CR, Faculty of Civil Engineering CTU and Faculty of Forestry and Wood Technology of Mendel University participated in the research.

The study is focused on evaluation of titanium dioxide nanoparticles (N-TiO₂) impact on photocatalytic properties of concrete surface. Specimens made from ordinary white cement with no TiO₂ particles, specimens made from commercially available photocatalytic cement and specimens made from white cement covered with polyvinyl alcohol (PVA) nanotextile containing N-TiO₂ were compared with respect to their ability to decompose rhodamine B dye when exposed to direct UV radiation. PVA nanotextile was prepared by electrospinning method. The solution exploiting the nanotextile was not found to be prospective in this phase of the research. However, the method of preparation of enriched nanotextiles as well as their application on the surface of concrete elements was tried and can be adjusted for different purposes.

Examples 9 to 15. Preface and helping data for calculation see Part 1 to 3.

Calculation according to Eurocode 5 examples 1 to 8. Preface and helping data for calculation see Part 1 to 3.

Multipurpose O2 (former Sazka) Arena is remarkable building which was given many awards including European Steel Design Award. The article deals with project, production and completation of the Arena's steel construction with plentiful picture and project documentation.

Preface – Helping data (finish): Laterally loaded nails – Values of Johansen strength for prebored and unprebored roud nails – Effective number of fasteners – Values of Johansen strength for dowels/bolts in timber-metal plate joints – Nailed joints strength in tension

The objective of the present paper is to provide design guidance through the structure of texts of the European structural standards for steel structures, Eurocodes 3. The current situation in the preparation of new version of Eurocodes with help of Technical Committees of ECCS TC 10 is described.

The paper will describe the technical requirements for the choice of the material for the steel structures and bridges. They are specified by the steel structures designer in the different deign stages. However, the tender design is the stage, where the full material specification should be given. The paper will be divided to several parts, that will describe all specification for the design, testing and checking of material.

Preface – Helping data (continuation): Compression design strength at an angle to the grain – Columns: buckling coefficients for solid timber and for homogeneous glued laminated timber – Stability of members: Beams subjected to bending without compression force – Tilting factors – Laterally loaded joints with dowel type fasteners.

Preface – Helping data (first part): Reference design strengths for solid timber and for homogeneous glued laminated timber – Examples.

The article deals with Varnsdorf ice rink roof project and construction. The supporting structure made form wood and steel was quite complicated due to slanting swivel joint pillars in B and C axes. Three cranes, one lifting platform and one moving scaffold were needed for the construction.

Timber and glass are the materials that have excellent aesthetic qualities. In current architecture, glass, as well as wood, are increasingly used for the visually exposed structures. Since glass is a brittle material, various types of hybrid structures are developed. Glass in hybrid element is combined with other material (eg. concrete, timber, steel, aluminium etc.) to increase load-bearing capacity and stiffness of the element, achieve safe failure behaviour together with high level of transparency. Nowadays, several European universities and research centres deal with the glass-timber load-bearing elements. This article provides an overview of the developed hybrid timber-glass structures including an experimental analysis of adhesive timber-glass joints, which was performed at Czech Technical University in Prague.

Transparency and also smooth, glossy and reflective glass surface give special importance of this material in the contemporary architecture. Connections between two glass elements or glass pane and other part from a different material are very important issue for structural applications of glass. Moreover, there are many types of hybrid structures that combine glass and different materials to achieve safe failure behaviour and high degree of transparency at the same time. Connection of brittle glass and reinforcing material is an essential part of these structures, where composite action between two parts is beneficially ensured by a glued joint. Experimental determination of mechanical characteristics of various adhesives applied in planar connections under shear loading is a main topic of current paper.

This paper presents methods to enhance the punching shear resistance of existing flat slabs (enlargement of supported area, enhancement of flexural resistance of slab, post-installed shear reinforcement and prestressed solutions). In case of post-installed shear reinforcement, systems based on steel and CFRP are mentioned. Static, technological and economic advantages and disadvantages are analysed. Differences between the systems are mainly due to the requirement to access the upper face of the slab, resistance-decrease in case of fire and deformation capacity of the strengthened slab.

The corrosion of steel reinforcement is the most important factor in degradation of the concrete structures. The use of the new composite materials as reinforcement in concrete structures has expanded in recent years. These concrete structures are often exposed to extreme environmental loads. The fibre reinforced polymer (FRP) materials are an alternative to the steel reinforcement. It is a durable material, which has corrosion resistance, high tensile strength and low density. The manufacturers use various kinds of fibers in the FRP reinforcement, especially carbon (CFRP), glass (GFRP), aramid (AFRP) and basalt (BFRP). The present article describes the application of the FRP reinforcement as a replacement of the steel reinforcement in new structures, respectively for strengthening of existing concrete structures.

This paper proposes statistical methods for evaluation quantitative performance determinated by tests of building products for objective decision during conformity assessment / certification in a fire protection field. The procedure is applicable for other types of products, and research / development of new material products.

Concrete exposed to high temperature considerably changes its properties down to total destruction. The paper describes renovation of concrete floor damaged by a fire of a factory building. Individual steps of determination of damage of concrete floor structures caused by high temperatures are described. Structure of damaged floor was technically analyzed, redevelopment was designed and renovation works were carried out.

Research, development and testing of materials and safety features used to protect civilians and armed forces against terrorist or military attacks are more than desirable nowadays. Therefore, our work is aimed at absorption materials that can temper impact energy and shockwave energy originating in explosive blast.
Out of many materials potentially suitable for experiments, two groups of fillers were chosen – macro fillers and micro fillers – and a two component polyurethane binder. In this article, the resulting physico-mechanical characteristics are summarized: bulk density, flexural, compression and impact strength. The crucial test for determination impact energy absorption was the Split-Hopkinson pressure bar test, conducted with most samples.

Buildings which are issued to natural changes of atmospheric temperature, should be divided to parts that can act independently. If not, the structure itself will be split up according to the general laws of physics and the internal and external form and material properties of the structure. The article describes failures of expansion joints of constructions.

This article deals about tropical hardwood species used for commercial purposes. These kinds of wood have more advantages like better natural durability against bio-degradation caused by high amount of extractives and good mechanical and physical properties. But their using is also connected with some questions – ecological and economical aspects and stability of supposed properties for each delivery. Not solved problem is protection against weathering and mainly decreasing of colour changes of tropical wood surfaces in the exterior till now.