The article presents the technical and economic indicators previously proposed solutions truss reinforced concrete beams with combined prestressing. Reducing consumption of concrete and steel in comparison with typical. This reduces the weight of the beams and money. Significant economic effect is achieved by the use of roof beams t profile with a shelf in the stretched area. This effect is achieved due to a significant reduction of the structural height of the coating (beams and slabs). By reducing the volume of the brick walls of the building, which is based on the overlap, the cost of masonry with single-span building, as noted above, reduced by 33% in comparison with a standard solution.

Keywords: truss reinforced concrete beam, combo-prestressing of prestressed reinforcement

The article proposes an analytical description of the deformation diagrams of concrete and pre-stressed high-strength reinforcing steel used for development of calculation methods of reinforced concrete elements with combined prestressing. In the developed method of calculation is the rectangular stress distribution in the compressed area of the flexible reinforced concrete element is adopted actual curved that in the case where the relative height of the compressed zone of the cross section close to the boundary ξ ξR, significantly clarifies the calculation. With this purpose, the curve σв – EV, obtained at a Central compression of the concrete prisms.

Keywords: stress-strain diagram of concrete, stress-strain diagram of steel

Excessive glass area , as well as the orientation of the plane of the lights on the horizon , particularly in the southern regions with hot and dry climate with plenty of clear and cloudy days in a year , helps increase the flow of heat into the room in the summer and extreme cold in winter, which causes additional ex- pluatatsionnye the cost of ventilation and heating of buildings . This article discusses issues related to the selection and design of optimal systems ceiling light industrial buildings to meet specific CCA - tures of the light climate in the southern regions .

Keywords: Overheating of the premises , thermal radiation, overlap , Shed lights , skylights , maximum temperature , environment settings , the heat transfer coefficient , the scattered radiation , relative humidity

The paper presents a new constructive solutions of concrete ribbed slabs with prestressed reinforcement coating , in which the edges stretched zones have stepped shape. This helps outline the cliff high prestressed reinforcement along the length of the element that allows you to increase the utilization rate of reinforcement in comparison with a standard solution.

Keywords: ribbed slabs covering equal resistance of prestressed reinforcement , stepped shape