Currently, when designing various residential buildings, there has been a tendency to use monolithic reinforced concrete to cover significant spans. The article proposes the calculation of the outside racks of volumetric scaffold. The bearing capacity of the outside racks is reduced due to eccentric compression of the racks. Alignment of the bearing capacity of the racks provides a span decrease in the placement of outside racks. At the same time, all racks experience central compression and work in the same conditions. This article is a continuation of the paper dedicated to the calculation of volumetric scaffolding of monolithic slab formwork, published in this volume. Article considers the calculation of the outside racks of formwork scaffold, which, in contrast to the intermediate ones, experience bending stresses due to asymmetric load.
Currently, when designing various residential buildings, there has been a tendency to use monolithic reinforced concrete to cover significant spans, often using structures with a complex geometric structure. This article proposes a methodology for calculating the permissible load on the scaffold racks from the conditions of strength and stability using the classical approaches of materials mechanics and structural mechanics for this purpose, in order to optimize the consumption of materials and to identify real “steps” of racks horizontally and vertically, while observing the requirements for such structures for strength and stability. Cases of non-standard arrangement of outside scaffold racks of monolithic slab’s formwork are considered.
This article describes the working process of OMK Heavy Plate Mill 5000. Based on the fabricator's facilities capability, the technological production flow diagram of thick steel sheets of K60 (X 70) grades, for cold-working large diameter pipes has been developed. As the initial blank authors used a 310×2.100×3.170 mm plate slab. The controlled rolling process, described in the article, consists of two stages –roughing-down (when deformation and re-crystallization results in obtaining fine uniform austenite grains) and finishing rolling (when austenite is hammer-hardened and converted into fine-grain ferrite). As a result of the research has been selected and the optimal temperature conditions for rolling in the passes, which would reduce the waste of metal in furnace.
In the present scientific work a thickness calculation procedure of an aluminum gas-thermal coating, sprayed on the low-alloyed steel surfaces, in order to provide its effective protection at high temperatures, has been developed. The method is based on the calculations of the diffusion layer thickness with consideration the temperature change on the blank`s surface and on the dependence of the parameter (directly proportional to the diffusion coefficient) on the temperature over the range 700 to 1200 °C.
The paper reviews and develops the mathematical model of plastic flow during the hot-forming processes. A flat non-stationary temperature problem for a cross-section of a long solid (rolled product) of arbitrary shape with different heat transfer conditions along the perimeter of the cross-section was considered. Equations for calculation of the thermal conductivity coefficient and heat capacity of tungsten billets were obtained in the temperature range of 700 - 1500°C, based on the literature data. Analytical dependences in form of regression equations were obtained, allowing for computer calculations of physical specifications of 11x11 mm VA grade tungsten billets in form of temperature functions with accuracy sufficient for practical calculations.
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