The article analyzes in detail the results of the performed reconstruction works with the application of thermosetting polymers. The method of adhesive anchoring of reinforcement rods with fixing them in the concrete body with acrylic glue was carried out on transport infrastructure facilities (railway steam shop and railway itinerary post). It has been determined that strengthening the foundation with application of the thermosetting polymers (adhesive anchor joints) gives a significant reduction in the consumption of concrete, metal and labor costs. The advantage of such acrylic adhesives is the possibility of varying the ratio of monomeric and polymeric part (powder) containing redox system, within acceptable concentrations, without significant changes in adhesion and cohesion parameters. The obtained results are very important in practice, because in the conditions of preparation of the adhesive (especially in construction conditions) it is difficult to determine the exact number of components. The experimental research data can be used for attachment joints projecting and industrial technological lines development, as well as for further polymeric adhesive materials, widely applied in industrial and civil engineering, improvement.
Показана необхідність нормалізації до безпечних значень індукції статичного геомагнітного поля (ГМП) у приміщеннях висотних каркасно-монолітних житлових будинків, масивні феромагнітні несучі конструкції яких значно (на 50%) по-слаблюють природне ГМП. Теоретично і експериментально обґрунтовані методи нормалізації ГМП, що реалізуються без застосування додаткових екрануючих елементів. Розроблено рекомендації з проектування та будівництва «магніто-чистих» житлових будинків з комфортними умовами проживання за статичним геомагнітним полем. Бібл. 15, рис. 8. Ключові слова: статичне магнітне поле, залізобетонні конструкції, нормалізація геомагнітного поля в приміщеннях.Показана необходимость нормализации до безопасных значений индукции статического геомагнитного поля (ГМП) в помещениях высотных каркасно-монолитных жилых домов, массивные ферромагнитные несущие конструкции ко-торых значительно (на 50%) ослабляют естественное ГМП. Теоретически и экспериментально обоснованы методы нормализации ГМП, реализуемые без применения дополнительных экранирующих элементов. Разработаны рекомен-дации по проектированию и строительству «магниточистых» жилых домов с комфортными условиями проживания по статическому геомагнитному полю. Библ. 15, рис. 8. Ключевые слова: статическое магнитное поле, железобетонные конструкции, нормализация геомагнитного поля в помещениях.
має кругову нескінченну циліндричну порожнину, паралельну його поверхні. Шар і півпростіроднорідні ізотропні матеріали, відмінні один від одного. На порожнині і на верхній межі шару задані переміщення. Для розв'язку просторової задачі теорії пружності використаний узагальнений метод Фур'є щодо системи рівнянь Ламе. В результаті задоволення граничним умовам і умовам сполучення шару і півпростору, отримані нескінченні системи лінійних алгебраїчних рівнянь, які розв'язані методом редукції. В результаті були знайдені переміщення і напруження в різних точках пружного тіла. Проведено числовий аналіз напруженодеформованого стану шару і півпростору. Ключові слова: циліндрична порожнина в півпросторі, композит, рівняння Ламе, умови сполучення, узагальнений метод Фур'є Miroshnikov V.Yu. DETERMINATION OF THE STRESS STATE OF THE COMPOSITE IN THE FORM OF A LAYER AND A HALF-SPACE WITH A CYLINDRICAL CAVITY, WITH DISPLACEMENTS SPECIFIED ON THE BOUNDARY SURFACES. The spatial problem of the theory of elasticity for a half-space rigidly coupled to an elastic layer is solved. The half-space has an infinite circular cylindrical cavity parallel to its surface. Layer and half-space-homogeneous isotropic materials, different from each other. Displacements are specified on the cavity and on the upper boundary of the layer. To solve the spatial problem of the theory of elasticity, the generalized Fourier method with respect to the system of Lame equations is used. As a result of satisfying the boundary conditions and the conjugation conditions of the layer and half-space, infinite systems of linear algebraic equations are obtained, which are solved by the reduction method. As a result, displacements and stresses were found at various points of the elastic body. A numerical analysis of the stress-strain state of the layer and half-space is carried out.
The scientific work is devoted to the interaction process of concrete and composite reinforcement, which is characterized by “adhesion-slip” dependence. It is known, that composite reinforcement does not behave in the same way as traditional steel reinforcement, because in some cases their mechanical properties differ significantly. CFRP/FGRP/BFRP products have higher strength, but a lower modulus of elasticity, so direct replacement of steel with such reinforcement is not always possible according to many constructional requirements. Adhesion forces create a complex stress-strain condition in concrete interacting with reinforcement. This condition leads to the distribution of loads along the axis of reinforcement, and, as a result, the longitudinal forces on reinforcement become variable along the entire length of the rod. A detailed analysis of the existing approaches to the problem of adhesion level of concrete and composite reinforcement is performed in article. It was determined that the complex multiparameter state of the interaction of concrete and composite reinforcement is characterized by the corresponding curves of “adhesion-slip” dependence, which can be obtained by two experimental methods (beam test method and direct pull-out test method). A theoretical research of the adhesion level of concrete and composite reinforcement (beyond the limits of cracks formation) was carried out, connected with the analysis of the distribution of deformations of concrete and reinforcement along the span of the element. Current analysis is based on the determination of a number of differential equations with a step-by-step description of adhesion level problems. The results of research can be used in future during the design and calculation of concrete structures reinforced with different types of composite reinforcement (based on basalt, glass, carbon fibers etc.), however, it is necessary to conduct further experiments into the long-term operation (behavior) of composite reinforcement over time under the influence of various factors, to establish a number of rheological aspects. Keywords: adhesion, calculation, algorithm, composite reinforcement, concrete, slip.
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