Applied Mechanics and Materials Vols. 633-634

Abstract: The article introduces the results of the experimental research of the influence of elevated temperatures on the modified fine-grained concrete strength and strain under axial compression.

Abstract: The article considers the problem of physical deterioration of brick five-storied apartment buildings, when they are already close to the point, when they are not repairable. The aim is the reconstruction, which allows to improve the quality of habitation. Area of house and its illumination increases due to redevelopment. Narrow and elongated shape of spaces becomes more harmonious. Number of windows increases, more light passes through the glazed and unglazed balconies and loggias. This project has social significance for the housing stock of St. Petersburg.

Abstract: The article presents results of energy inspection of an educational building “Hydrotechnical building-2” of the Saint-Petersburg State Polytechnical University. The energy audit was carried out to estimate energy resources performance and define opportunities for its increase. According to the results of energy audit the analyses of state of energy consumption are provided. The class of energy efficiency is defined. The recommendations and prospective opportunities to save energy and increase power efficiency of “Gidrokorpus-2” are presented as a resume of this article.

Abstract: With the lapse of time, the carrying capacity of early steel structure buildings which affected by various factors in the process of long service has dropped. Meanwhile, the use function of buildings has been asked for a higher level with the improvement of people's living standard. In this case, the assessment and reinforcement on buildings are particularly important. In this paper, the characteristics and mechanical properties of axially loaded steel columns strengthened by welding under load and axially loaded steel columns strengthened by enclosed reinforced concrete under load, the mechanism of steel and concrete work together and the reduction coefficients of steel and concrete of enclosed reinforced concrete have been systemically introduced. To pave the way for the following researches of steel numbers reinforced under load.

Abstract: With the improvement of requirements for the building, and the effects of various factors for some existing steel structure building during the long-term service process, structural function is damaged, which requires reinforcement for existing structures to meet the requirements of its use of the function. This paper systematically introduces the research and application of steel structure member on strengthening aspects, which is prepared for the research of steel column reinforced by enclosed reinforced concrete under axial compression with initial compressive load. According to development and characteristics of steel columns reinforced by enclosed reinforced concrete under axial compression, this paper analyzes the common working mechanism of steel structure and concrete after reinforcement, and introduces the calculation method and its engineering application in our country.

Abstract: This article provides the numerical elastic buckling analysis of simply supported cold-formed lipped channels subjected to pure bending. A methodology for computing simulation of a new type of thin-walled thermo-profile (reticular-stretched) is developed. For flexural elements buckling modes and values of critical force are calculated. FE simulation evaluates the influence of web height and span on the critical load and buckling modes for cold formed beams of different lengths.

Abstract: To study the seismic resistance of subsea pipelines, the following item-wise calculations are made for the following exposures:- determining the seismic hazard of the area;- analysis of pipeline integrity and pipeline-soil interaction;- analysis of soil stability along the pipeline route.Assessment of the stressed state of a vibrating subsea pipeline is related to the need to determine the values and basic dependencies of resistance forces (damping, energy dissipation) when exposed to vibrations. Energy dissipation taking place in case of subsea pipeline vibrations is composed of hydrodynamic resistance losses, losses due to resistance in the structural material of a pipeline (insulation coating, lining, concrete coating, ballast) and losses to the soil through supports.

Abstract: In this paper, the vibration characteristics of plate and stiffened plate in the flow field are calculated by employing fluid-solid coupling method. The wet-frequency and wet-mode numerical computing results are analyzed. The influence of boundary condition, edge length ratio and depth of water on wet mode and wet frequency are studied. A mixed finite element-boundary element method is adopted in the numerical calculation, which makes the added water mass matrix calculation be limited to the liquid-solid interface. Thereby, the calculated amount is significantly reduced and the calculation efficiency is increased.

Abstract: Most methods for calculating bearing capacity profiles section of complex shape local buckling (LPA) are ignored. The problem of LPA rod is reduced to the problem of overall sustainability. At the design stage constructions of thin-walled beams, it is important to have a simple method for estimating the bearing capacity and the potential loss of local and general stability of the structure.

Abstract: Finite element method is often used to solving composite geotechnical problems. Application of these programs demands special attention for models for the setting parameters and simulation of soil behaviour. The problem of model selection to describe the behaviour of soils for calculation of settlement is considered in test task applied to complex geotechnical conditions of Saint-Petersburg. Comparison of obtained settlement values is carried out in Linear Elastic model, Mohr-Coulomb mode and, Hardening Soil model. The results of calibration of parameters for geotechnical model from the use of the qualities of odometer testing are shown.