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Designers more and more often choose facade systems with ventilated layers for external walls, especially in the case of new buildings. They are also used to modernize existing buildings. Mechanical connectors are a characteristic element of these constructions. Often, they are ignored in calculating the heat balance of rooms and the entire building. Because they pierce the thermal insulation layer they cause point thermal bridges. The influence of thermal point bridges, usually made of aluminum, i.e. a material with very high thermal conductivity, for heat transfer turns out to be significant. Such thermal bridges significantly increase heat losses through building partitions. This situation increases the heat demand in the rooms to compensate for the heat loss. The article presents the results of the analysis of the impact of mechanical fasteners in ventilated facade systems on heat transfer in the building envelope. The influence of various materials and constructional solutions on the thermal conditions in these walls was investigated.

Minimization of the demand for energy which is needed to heat a building is an important issue of a sustainable development policy, therefore mutual exchange of heat between the interior of the building and its external environment through a window as well as its mounting parts is one of the most important issues of energy calculations.In the paper, the SCM (Quick Warm Mounting) sill beam used as a support for a window installed in a thermal insulation layer is analyzed. Due to the fact that titanium has a more favorable specific strength, lower coefficient of thermal conductivity and much higher resistance to corrosion than steel, the currently used steel reinforcement of the SCM beam was replaced by a titanium one. Numerical calculations were performed using the ADINA System, which is based on the finite element method (FEM). The process of heat exchange between the interior with the constant temperature of 20°C and the external environment with the constant temperature of -20°C is analysed. The temperature distribution in the wall, the dew point temperature as well as corrosion and economical aspects associated with the use of titanium profiles are discussed.

In the article, the compressive strength of steel-concrete structures defined as CFST (Concrete Filled Steel Tubular) has been checked. The steel elements used in CFST columns have high tensile strength and ductility while the concrete elements have high compressive strength and stiffness. Therefore, CFST elements have a large range of applications in construction. The analysis included 8 examples of elements consisting of a steel tube filled with a concrete core. The examples differed in the thickness of the steel coating and the compressive strength of the concrete core. Analytical calculations and experimental studies for them were carried out. The analytical calculations were based on the author’s method of assessing the load-bearing capacity of concrete-filled steel tubes. In experimental verification, CFST samples were subjected to a static compression test. The calculation method was also used to calculate the load capacity when composites reinforcement is the outer coating for the concrete core. Three types of composites were analysed. The obtained results show a large influence of the steel coating thickness on the compressive strength for the CFST elements. The load-bearing capacity of the elements depends on the appropriate ratio of the surface of the steel coating to the concrete coating.