The authors developed a model for single reinforced concrete strips in block wedge and arches between inclined cracks and approximated rectangular cross-sections using small squares in matrix elements. From the analysis of the works of N.I. Karpenko and S.N. Karpenko the "nagel" forces in the longitudinal tensile reinforcement and crack slip , as a function of the opening width and concrete deformations in relation to the cosine of the angle . The experimental " nagel " forces and crack slip dependences for the connection between and in the form of an exponent for the reinforcement deformations and spacing are determined. The forces have been calculated for two to three cross-sections (single composite strips) of reinforced concrete structures. On the bases of accepted hypothesis, a new effect of reinforced concrete and a joint modulus in a strip of composite single local shear zone for the difference of mean relative linear and angular deformations of mutual displacements of concrete (or reinforcement) are developed. The hypothesis allows one to reduce the order of the system of differential equations of Rzhanitsyn and to obtain in each joint the total angular deformations of concrete and the "nagel" effect of reinforcement. The curvature of the composite bars has a relationship from the total bending moment of the bars to the sum of the rigidities. The stiffness physical characteristics of the matrix from the compressed concrete area and the working reinforcement are obtained in a system of equations of equilibrium and deformation, as well as physical equations.

In recent years, thin-walled, cold-formed steel (CFS) structural members have gained expanding use in building construction and various sorts of structural systems [1,2,3].The utilization Cold-Formed Steel (CFS) structures has become progressively popular in different fields of building technology. The reasons behind the developing popularity of these products include their ease of fabrication, high strength/weight ratio and suitability for a wide range of applications. These advantages can result in more economic designs, as compared with hot-rolled steel, especially in short-span applications. In this project work attempt has been made to use Cold formed steel section as replacement to conventional steel reinforcement bar.

Many of the complex reinforced Autoclaved Aerated Concrete characteristics under shear and flexure are yet to be identified to employ this material advantageously and economically, as it has many advantages of low weight, fire resistance, acoustic and thermal insulation. It is observed in the article that under two-points loading system, diagonal cracks are usually the first cracks to be observed in the deep beam clear span. The diagonal cracks first are developed in relatively deep beams and the flexural cracks are first developed in shallower beam. The principal mode of failure in the deep beams having adequate reinforcement is diagonal tension cracking. The shear failure is a common type for all beams. This indicates a weak the bond strength between lightweight concrete and reinforcing steel. There are many factors affecting the bond strength between the lightweight concrete and reinforcing steel, where the compressive strength plays an important role in bond strength, and the bond strength is increased by increasing the compressive strength. The AAC beams have the potential to be an excellently energy-saving construction material and is believed to emerge as an alternative to traditional reinforced concrete beam in the near future. This is proved by the experimental analysis.

The cost-efficient field design is very important in the civil engineering. Therefore, the cold-formed steel structures (CFS) are preferred for construction. A Sophisticated CFS structure which uses a Cellular Concrete is implemented in this paper. The utilization Cold-Formed Steel (CFS) structures have become increasingly popular in different fields of building technology. The reasons behind the growing popularity of these products include their fabrication ease, high strength/weight ratio and suitability for a wide range of applications. These advantages can result in more economic designs, as compared with hot-rolled steel, especially in short-span applications. In this project work an attempt to use a Cold formed steel section as replacement to conventional steel reinforcement bar has been made.

Донченко О.М., канд. техн. наук, проф., Аль-Хашими Омар Исмаел, аспирант Белгородский государственный технологический университет им. В.Г. Шухова СОВРЕМЕННОЕ СОСТОЯНИЕ ТЕОРИИ СОПРОТИВЛЕНИЯ И МЕТОДОВ РАСЧЕТА КЛАДКИ ИЗ ЯЧЕИСТОБЕТОННЫХ КАМНЕЙ ПРИ СЖАТИИБлагодаря своим хорошим физико-механическим свойствам искусственные бетонные камни высотой 200-300 мм сейчас широко применяются при строительстве наружных и внутренних стен мало-и многоэтажных гражданских зданий, существенно потеснив традиционный керамический и силикатный кирпич. Из пустотелых керамзитобетонных и полнотелых ячеистобетонных камней автоклавного изготовления возводят более 65 % стен таких зданий. Учитывая низкую теплопроводность, их применяют для устройства однослойных наружных несущих стен малоэтажных и самонесущих стен многоэтажных и высотных зданий, опирающихся на перекрытия. Более широкое применение новых наиболее эффективных ячеистобетонных материалов автоклавного изготовления, являющихся наиболее действенными для снижения материалоемкости нашего строительства, сдерживается отсутствием достоверной и физически обоснованной теории сопротивления и удовлетворительной нормативной методики расчета их кладки.Ключевые слова: сопротивление сжатию кладки, центральное сжатие, прочность при внецентренном сжатии, изгибающий момент, кладка из ячеистобетонных камней.