The paper deals with the energy balance of windows for different combination of glazing parameters in connection with their orientation. Sum of solar gains through the transparent surfaces of a building envelope depends mainly on the size, their orientation and the g-value. Large glazed surfaces with correct orientation ensure large solar gains, but they are also the weakest part of the thermal isulating building envelope.
The influences of various U-value (U_g) and g-value of glazing on the energy performance of selected passive house were calculated by the use of computer simulation.

The European standard ČSN EN 17037 Daylighting of buildings has been valid in the Czech Republic since August 2019. A year and a half is enough time for the first evaluation of its functioning in project practice. The author of the article deals intensively with this practice and in this paper he would like to share some of his findings concerning the assessment of solar exposure of buildings according to this new European standard. On the edge of this problem, the relationship between accuracy and uniformity in normative requirements is also discussed.

The subject of the complex repair of the ceiling structure of the water reservoir Pasohlávky was the remediation and static provision of the unsatisfactory reinforced concrete structure. The original condition was inadequate, parts of the concrete structure were dropped due to steel due to steel corrosion and small cover layers of concrete.

The article presents a stability analysis of circular arches under various uniform loadings (vertical to the arch plan, vertical to the arch length or radial to the arch axis). Linear bifurcation analysis resulted into critical loadings used for determination of the arches buckling length factors. With the exception of the radial loading the variable axial arch forces need to be taken into account also for the relative Euler basic strut. The analysis covers various boundary conditions of the arches in supports. The study embodies arches with both closed and open cross sections and proved the significant impact of the cross-sectional shape on out-of-plane buckling values. The article outcomes are tables with correct buckling length factors of arches.

This paper deals with new methodology of design and verification of the limit state of punching of ceiling slabs in the prepared prEN 1992-1-1 [2]. The current methodology does not described with sufficient accurancy and with sufficient reliability the behavieur of the slabs structures in the area of supporting on columns and on ends and corners of walls.

Example of rehabilitation of sewerage facilities, shafts and chambers in an environment of the historic city center with increased loads of chemical-biogenic corrosion. Possible causes and consequences for both, original and newly constructed, building structures. Modification of the proposed solution, including the design of an appropriate construction structure and installation technology solution.

The circular economy in construction is currently absolutely essential in the context of limited primary resources. This applies in particular to the use of inert mineral materials created during the demolition of buildings. It is proven that in the period from 2011 to 2018, the share of recyclates from C&DW in the total production of inert mineral materials more than tripled. One of the barriers to higher production of recycled aggregates is the low level of demolition of buildings, which often makes it impossible to carry out quality recycling.

The paper deals with the new Czech standard ČSN 731004 Geotechnical Design – Foundations, Requirements for calculation methods, published in July 2020. The subject of this standard ase simple calculation methods for the design of foundation structures based mostly on conventional analytical methods validated by long-term use not only in the Czech Republic. The standard applies to flat foundation structures, bored piles and displacement piles, micropiles and jet-grouted columns for axial loading. The standard is primarily intended for structures falling under 2. geotechnical category.

The paper is focused on the current issues of protection and strengthening of wooden structures. The wood used for them is a construction material whose mechanical properties are shaped by the nature and because it is also an organic material, it is subjected to various degradation processes. Types of wood protection includes all measures which would protect wood from influences of fungi, insect, weather (temperature, humidity, wind, fire etc.) and can be divided into chemical protection and radiation protection. Chemical protection can be further divided into protection against weather, biological pests and against fire. In our paper the solution of this weakness by photocatalytic materials (namely TiO₂) is presented. Those materials are efficient UV absorbers and they are able to destroy biological aggressors as well. Nowadays, there is not enough information about the interactions between wooden surface and non-photoactive or photoactive form of TiO₂. TiO₂ exists in many morphological forms. The planar particles were chosen for purpose of the experimental investigation. This material was applied on wooden surface for creating a transparent layer. The results are presented in the first part of the paper. If it is necessary to increase the load-bearing capacity of wooden elements, one of the possibilities is to strengthen them by applying a high-strength layer containing carbon fibers. The second part of the paper is devoted to this procedure with a detailed description of how to implement and design this reinforcement.

The paper describes special types of fiber optic point sensors based on FBG (Fiber Bragg Grating) and FP (Fabry-Perót) structures. First part of the paper deals with principle of FBG and FP and their exposition. Next part is focused on different types of FBG and FP sensors and principle of interrogation units. Finally practical examples of use are listed.

The paper deals with special types of sensors that use optical fibers to measure various non-electrical quantities. The introduction describes the principle of light transmission in optical fibers and their applications. Main part is focused on fiber-optic sensors and their dividing. Special attention is paid to the distribution sensory systems and their practical application.

This article deals with the properties of recycled concrete aggregate (RCA) from two-phase recycling. Specifically, it is the 8–16 mm fraction, which is already commonly used in practice in compliance with standard requirements, the 4–8 mm fraction, the use of which is problematic from the point of view of standard regulations. The article focuses mainly on the key properties of RCA that affect the design of concrete mixtures.

Fire separation distance is an area around a building where a risk of a fire spread to another building due to radiation is imminent. The article deals with the separation distances of corner window. Is It describes several methods of assessing, from using prescriptive methods of Czech legislation to CFD numerical simulations, and it also presents the limitations of particular methods. Finally, the method of corner window fire separation distance is proposed.

This contribution deals with damage to buildings and building materials due to bad manage of rainwater regime. Effects are divided according to location of damage. First, the damage of roofs and roof trusses is presented, which are followed by examples of damage to the enclosure walls. The most attention, including numerical 3D modeling, is devoted to damage to foundation structures and foundations.

The increasing amount of construction and demolition waste is gaining the attention of research institutes that deal with the possibilities of using this waste. This article deals with the possibility of using masonry aggregate from construction and demolition waste in concrete samples. The most important are the properties of the aggregate as follows a suitable concrete recipe optimization with various number of replacements of natural aggregates with recycled masonry aggregates. The experiments in this paper are summarized in two categories - geometric and physical experiments.

Many historic buildings are located in areas where there is a specific type of earthquake activity, the so-called earthquake swarms, during which a series of thousands of weaker tremors take place for several days or months. Sometimes these shocks are strong enough to be felt by people, and in some cases they can even cause material damage to buildings. Knowledge of the response, especially of vaulted structures of historic buildings to dynamic loads, is the basis of remediation interventions on monumental buildings exposed to these effects. Due to the increasing intensity of wheel and rail traffic, there is also an increase in the effects of the so-called technical seismicity on structures located near roads and tracks. The proposed system of additional stiffening of barrel, cross or of spherical vaults by means of prestressed flexurally rigid segmental ribs contributes to the increase of their resistance to the natural and anthropogenic dynamic effects.

Panels for openings in structures have always been an essential and integral part of buildings. Their importance in terms of a building´s functionality was not recognised. However, the general view on this issue has changed from focusing on big planar segments and critical details to sub-elements of these structures. This does not only focus on the forms of connecting joints but also on the supporting systems that keep the panels in the right position and ensure they function properly. One of the most strained segments is the threshold structure, especially the entrance door threshold structure. It is the part where substantial defects in construction occur in terms of waterproofing, as well as in the static, thermal and technical functions thereof. In conventional buildings, this problem is solved by pulling the floor structure under the entrance door structure and subsequently covering it with waterproofing material. This system cannot work effectively over the long term so local defects occur. A proposal is put forward to solve this problem by installing a sub-threshold door coupler made of composite materials. The coupler is designed so that its variability complies with the required parameters for most door structures on the European market.

Within the research project NAKI DG16P02M055, an extensive experimental and theoretical research of the influence of grouting on the physical and mechanical properties of brick and stone masonry is carried out. The focus of the research is to verify, in particular, the strengthening effect of selected grouting mixtures based on hydraulic lime (nano-lime), resins and silicates. The influence of grouting on the change of porosity, pore distribution, absorptivity and strengthening effect of grouting of historical brick, marl, sandstone, trachyte, limestone and mixed masonry with lime binder using various types of grouting mixtures in comparison with ungrouted masonry is evaluated. Particular attention is paid to the masonry damaged by cracks and cavities.

Development of the second generation of Eurocodes for climatic actions in the framework of the technical subcommittee CEN/TC250/SC1 is nearly finished. Revised Eurocodes should be more transparent, user-friendly and provide information about the basis of climatic actions and their effects on structures. National selection of the National Determined Parameters is expected to be given in the National Annexes including updated climatic maps.

Many structural concrete elements of dams must withstand extreme frost stress and abrasion of fast-flowing water. At present, several reconstructions of concrete overflows, chutes of dams or weirs are underway or have already taken place with the requirement for increased resistance to abrasion. From the point of view of ČSN EN 206, abrasion-resistant concretes are determined by exposure class XM, but the evaluation criteria and testing methods are insufficient. The article deals with a closer presentation of the requirements for the properties and development of concrete with high resistance to abrasion and frost and its subsequent testing.