Pub Date : 2023-06-27DOI: 10.22337/2587-9618-2023-19-2-60-70
Anastasia Karakozova, Vladimir Mondrus
Subject of the research: Today, the design of flexible, extended in length and height structures of transport, industry, communication is one of the important directions of construction development. Such structures include continuous extended metal constructions such as chimneys, poles, billboards, monuments, bridges, pipelines. Besides ensuring the limit states for strength and deformability, there is another important condition for the durable operation of metal structures which is the absence of aerodynamic instability phenomena (mainly wind resonance) during the whole service life. Objectives: Review of the background, analysis of accidents that have occurred, proposals to avoid such situations at the design stage and in the occurrence of emergency conditions at existing facilities. Materials and methods: Review and analysis of existing data and proposals for further improvement of calculation and design methods. Results: The paper analyzes the mechanisms of the main types of aerodynamic instability (wind resonance, flutter, galloping, oscillations in the airfoil) on different types of structures, presents particular cases of the history of famous unique constructions and the authors' calculation practice, describes the ways to avoid this type of phenomena in the design of new buildings or in emergency situations on existing structures. Conclusions: The phenomena described in the article are applicable to an extremely narrow area of construction and are often ignored in calculation and design. This article is intended to draw special attention to these phenomena not only for designers, but also for research engineers in order to create new mechanisms for their analysis.
{"title":"RESONANT VORTEX EXCITATION OF HIGH-RISE STRUCTURES","authors":"Anastasia Karakozova, Vladimir Mondrus","doi":"10.22337/2587-9618-2023-19-2-60-70","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-2-60-70","url":null,"abstract":"Subject of the research: Today, the design of flexible, extended in length and height structures of transport, industry, communication is one of the important directions of construction development. Such structures include continuous extended metal constructions such as chimneys, poles, billboards, monuments, bridges, pipelines. Besides ensuring the limit states for strength and deformability, there is another important condition for the durable operation of metal structures which is the absence of aerodynamic instability phenomena (mainly wind resonance) during the whole service life. Objectives: Review of the background, analysis of accidents that have occurred, proposals to avoid such situations at the design stage and in the occurrence of emergency conditions at existing facilities. Materials and methods: Review and analysis of existing data and proposals for further improvement of calculation and design methods. Results: The paper analyzes the mechanisms of the main types of aerodynamic instability (wind resonance, flutter, galloping, oscillations in the airfoil) on different types of structures, presents particular cases of the history of famous unique constructions and the authors' calculation practice, describes the ways to avoid this type of phenomena in the design of new buildings or in emergency situations on existing structures. Conclusions: The phenomena described in the article are applicable to an extremely narrow area of construction and are often ignored in calculation and design. This article is intended to draw special attention to these phenomena not only for designers, but also for research engineers in order to create new mechanisms for their analysis.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135454349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-27DOI: 10.22337/2587-9618-2023-19-2-42-50
А В Коргин
В настоящее время алюминиевые сплавы находят широчайшее применение в самых разнообразных сферах промышленного производства и строительства за счет уникальных свойств физико-механических, позволяющих создавать легкие, прочные, надежные, коррозионностойкие и эстетичные конструкции и изделия самого разнообразного назначения. Тем не менее, алюминиевые сплавы обладают рядом недостатков, основным из которых является более сложный и дорогостоящий процесс изготовления сварных конструкций, требующий применения более совершенных технологий – аргонодуговой сварки и сварки трением с перемешиванием, а также квалифицированного персонала по сравнению с классической электросваркой конструкций из стали. К подобным технологиям также относятся современные методы лазерной сварки и контактной конденсаторной точечной сварки, оборудование для которой достаточно компактно и мобильно, а его использование не требует персонала высокой квалификации по сравнению с другими технологиями сварки алюминия. Существующая нормативная документация РФ по контактной конденсаторной точечной сварке не дает достаточных рекомендаций по проектированию и расчету прочности соединений данного типа, что требует дополнительных экспериментальных исследований таких соединений. Целью настоящей работы явилось экспериментальное определение прочности соединений двух типов, выполненных с помощью технологии конденсаторной сварки и работающих на растяжение и срез – узлов потолочной подвески листов и профилей алюминиевого сплава АМГ2М к стержневым резьбовым тягам, выполненным из алюминиевого сплава АМГ3. Для этого были испытаны 18 соединений указанных типов и выполнены контрольные расчеты нормативными методами на растяжение и срез с целью оценки их применимости для расчетов соединений данных типов.
{"title":"ПРОЧНОСТЬ СОЕДИНЕНИЙ ИЗ АЛЮМИНИЕВЫХ СПЛАВОВ, ВЫПОЛНЕННЫХ МЕТОДОМ КОНТАКТНОЙ КОНДЕНСАТОРНОЙ СВАРКИ","authors":"А В Коргин","doi":"10.22337/2587-9618-2023-19-2-42-50","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-2-42-50","url":null,"abstract":"В настоящее время алюминиевые сплавы находят широчайшее применение в самых разнообразных сферах промышленного производства и строительства за счет уникальных свойств физико-механических, позволяющих создавать легкие, прочные, надежные, коррозионностойкие и эстетичные конструкции и изделия самого разнообразного назначения. Тем не менее, алюминиевые сплавы обладают рядом недостатков, основным из которых является более сложный и дорогостоящий процесс изготовления сварных конструкций, требующий применения более совершенных технологий – аргонодуговой сварки и сварки трением с перемешиванием, а также квалифицированного персонала по сравнению с классической электросваркой конструкций из стали. К подобным технологиям также относятся современные методы лазерной сварки и контактной конденсаторной точечной сварки, оборудование для которой достаточно компактно и мобильно, а его использование не требует персонала высокой квалификации по сравнению с другими технологиями сварки алюминия. Существующая нормативная документация РФ по контактной конденсаторной точечной сварке не дает достаточных рекомендаций по проектированию и расчету прочности соединений данного типа, что требует дополнительных экспериментальных исследований таких соединений. Целью настоящей работы явилось экспериментальное определение прочности соединений двух типов, выполненных с помощью технологии конденсаторной сварки и работающих на растяжение и срез – узлов потолочной подвески листов и профилей алюминиевого сплава АМГ2М к стержневым резьбовым тягам, выполненным из алюминиевого сплава АМГ3. Для этого были испытаны 18 соединений указанных типов и выполнены контрольные расчеты нормативными методами на растяжение и срез с целью оценки их применимости для расчетов соединений данных типов.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80743489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-27DOI: 10.22337/2587-9618-2023-19-2-172-187
Denis Konin, Alexander Fimkin, A. Olurombi
Stability calculation of steel rods should consider residual stresses, as well as local imperfections (bends, buckling). Codes of EU, USA, PCR considering difference between welded and rolled I-beams on compression and compression with bending. Coefficient of longitudinal bending has values that consider the presence of different values of residual stresses for welded and rolled I-beams. Russian code for the design of steel structures (SP 16.13330) for conditionally centrally compressed rods does not distinguish between methods of I-beams production. To determine residual stresses, a wide range of Russian profiles with different thin-walled was studied. Residual stresses for small-sized profiles were carried out by partitioning, for large I-beams - by drilling blind holes. The actual values of residual stresses in flanges and walls are established; most suitable curves for their approximation are selected. The actual shape of I-beams was also measured with a laser scanner. According to the results of curvature measuring, the limit and average values of local flanges deflection are established. Considering experimental studies, FE-modeling of rods with residual stresses was performed for both rolled and welded I-beams. In addition to code eccentricities, local shape imperfections were modeled. It is established that rolled I-beams show higher values of critical forces than welded ones by 8-16%. This is true for steels C355 and C390 with a lambda-factor of more than 4, and for C255 with lambda-factor more than 3. According to the study, a coefficient is proposed that increases the bearing capacity of rolled I-beams for medium and large flexibilities.
{"title":"RESUDIAL STRESSES IN I-BEAMS AND ITS EFFECT ON RODS BUCKLING","authors":"Denis Konin, Alexander Fimkin, A. Olurombi","doi":"10.22337/2587-9618-2023-19-2-172-187","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-2-172-187","url":null,"abstract":"Stability calculation of steel rods should consider residual stresses, as well as local imperfections (bends, buckling). Codes of EU, USA, PCR considering difference between welded and rolled I-beams on compression and compression with bending. Coefficient of longitudinal bending has values that consider the presence of different values of residual stresses for welded and rolled I-beams. Russian code for the design of steel structures (SP 16.13330) for conditionally centrally compressed rods does not distinguish between methods of I-beams production. \u0000To determine residual stresses, a wide range of Russian profiles with different thin-walled was studied. Residual stresses for small-sized profiles were carried out by partitioning, for large I-beams - by drilling blind holes. The actual values of residual stresses in flanges and walls are established; most suitable curves for their approximation are selected. The actual shape of I-beams was also measured with a laser scanner. According to the results of curvature measuring, the limit and average values of local flanges deflection are established. \u0000Considering experimental studies, FE-modeling of rods with residual stresses was performed for both rolled and welded I-beams. In addition to code eccentricities, local shape imperfections were modeled. It is established that rolled I-beams show higher values of critical forces than welded ones by 8-16%. This is true for steels C355 and C390 with a lambda-factor of more than 4, and for C255 with lambda-factor more than 3. According to the study, a coefficient is proposed that increases the bearing capacity of rolled I-beams for medium and large flexibilities.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83071167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-27DOI: 10.22337/2587-9618-2023-19-2-150-160
V. Moskovtseva, S. Fedorov, M. Amelina
A computational model is presented for determining deformations in complexly stressed beams of a structurally non-linear reinforced concrete frame in a transcendental state caused by a special emergency action in the form of a sudden removal of one of the structural elements. The determination of the stress-strain state after the formation of spatial cracks in the reinforced concrete elements of the frame was carried out using the calculated spatial section. At the same time, dynamic additional loads in the design section of the reinforced concrete frame element from a special impact are determined on an energy basis using the “bending moment-curvature” and “torque-angle of rotation” diagrams. The considered calculation algorithm includes the determination of forces in compressed concrete, longitudinal and transverse reinforcement for primary and secondary design schemes and verification of special limit state criteria. The results of a numerical analysis of the effect of cracking, the ratio of torque and bending moment on the stress state in transverse and longitudinal reinforcement and on the dissipative properties of a frame structural system are presented
{"title":"CALCULATION MODEL OF A MULTI-STOREY REINFORCED CONCRETE FRAME WITH COMPLEXLY STRESSED BEAMS UNDER ACCIDENTAL IMPACT","authors":"V. Moskovtseva, S. Fedorov, M. Amelina","doi":"10.22337/2587-9618-2023-19-2-150-160","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-2-150-160","url":null,"abstract":"A computational model is presented for determining deformations in complexly stressed beams of a structurally non-linear reinforced concrete frame in a transcendental state caused by a special emergency action in the form of a sudden removal of one of the structural elements. The determination of the stress-strain state after the formation of spatial cracks in the reinforced concrete elements of the frame was carried out using the calculated spatial section. At the same time, dynamic additional loads in the design section of the reinforced concrete frame element from a special impact are determined on an energy basis using the “bending moment-curvature” and “torque-angle of rotation” diagrams. The considered calculation algorithm includes the determination of forces in compressed concrete, longitudinal and transverse reinforcement for primary and secondary design schemes and verification of special limit state criteria. The results of a numerical analysis of the effect of cracking, the ratio of torque and bending moment on the stress state in transverse and longitudinal reinforcement and on the dissipative properties of a frame structural system are presented","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75778728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-27DOI: 10.22337/2587-9618-2023-19-2-188-204
Mr. Anupam Kumar Biswas, Dr. Aloke Kumar Datta, Dr. Pijush Topdar, Dr. Sanjay Sengupta
Steel structures are commonly utilized in vast areas in industries, and also now a days they are used in residential settings as well. Structures made of steel is a better alternative as their constructions have high strength, light weight and quick compared to other construction materials. Steel structure degradation is frequently related to an engineering system's underperformance and leads to collapse. Therefore, it is essential to identify the problem and take remedial steps to make sure that structures function as intended throughout their design lives. Among the best non-destructive assessment methods for finding problems is acoustic emission (AE). The current study evaluates the available literature on this method in a few major areas and discusses historical advances in each category. The pros and cons of each approach are discussed, and future study directions are suggested. This review examines the fundamental Acoustic Emission techniques and contemporary research to identify damage in different types of steel structures using various localization approaches. This research aims to find the ideal placement for a real-time sensor to detect deterioration in a steel-framed construction. Finally, the artificial intelligence techniques used to identify deterioration in the steel frame construction are discussed.
{"title":"ACOUSTIC EMISSION-BASED DAMAGE DETECTION IN STEEL FRAMED STRUCTURE- A REVIEW","authors":"Mr. Anupam Kumar Biswas, Dr. Aloke Kumar Datta, Dr. Pijush Topdar, Dr. Sanjay Sengupta","doi":"10.22337/2587-9618-2023-19-2-188-204","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-2-188-204","url":null,"abstract":"Steel structures are commonly utilized in vast areas in industries, and also now a days they are used in residential settings as well. Structures made of steel is a better alternative as their constructions have high strength, light weight and quick compared to other construction materials. Steel structure degradation is frequently related to an engineering system's underperformance and leads to collapse. Therefore, it is essential to identify the problem and take remedial steps to make sure that structures function as intended throughout their design lives. Among the best non-destructive assessment methods for finding problems is acoustic emission (AE). The current study evaluates the available literature on this method in a few major areas and discusses historical advances in each category. The pros and cons of each approach are discussed, and future study directions are suggested. This review examines the fundamental Acoustic Emission techniques and contemporary research to identify damage in different types of steel structures using various localization approaches. This research aims to find the ideal placement for a real-time sensor to detect deterioration in a steel-framed construction. Finally, the artificial intelligence techniques used to identify deterioration in the steel frame construction are discussed.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84607214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-168-177
Y. Tyukalov
The solution of the volume theory elasticity problem was obtained on the basis of the additional energy functional and the possible displacements principle. On the basis of the possible displacements’ principle, equilibrium equations for grid nodes are compiled, which are added to the additional energy functional using Lagrange multipliers. Linear functions are taken as possible displacements. The volumetric finite element based on piecewise constant approximations of stresses is presented. The stress fields are continuous along finite element boundaries and discontinuous inside ones. The calculation results of a cantilever beam and a bending plate are presented. The obtained solutions are compared with the solutions by the finite element method in displacements. The proposed finite element makes it possible to obtain more accurate stress values.
{"title":"BULK THEORY ELASTICITY FINITE ELEMENT BASED ON PIECEWISE CONSTANT APPROXIMATIONS OF STRESSES","authors":"Y. Tyukalov","doi":"10.22337/2587-9618-2023-19-1-168-177","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-168-177","url":null,"abstract":"The solution of the volume theory elasticity problem was obtained on the basis of the additional energy functional and the possible displacements principle. On the basis of the possible displacements’ principle, equilibrium equations for grid nodes are compiled, which are added to the additional energy functional using Lagrange multipliers. Linear functions are taken as possible displacements. The volumetric finite element based on piecewise constant approximations of stresses is presented. The stress fields are continuous along finite element boundaries and discontinuous inside ones. The calculation results of a cantilever beam and a bending plate are presented. The obtained solutions are compared with the solutions by the finite element method in displacements. The proposed finite element makes it possible to obtain more accurate stress values.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78226547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-155-167
В практике проектирования и строительства широко применяются численные расчеты с использованием современных вычислительных комплексов, позволяющие эффективно решать задачи по проектированию, возведению и эксплуатации зданий и сооружений различного функционального назначения. Сравнительный анализ численных, теоретических и экспериментальных исследований в области строительных конструкций, зданий и сооружений показывает, что точные методы расчета дают достоверные данные о предмете исследования. В настоящей статье приводятся результаты численных исследований тепловой эффективности неоднородных вертикальных ограждений на примере нескольких вариантов конструктивного решения наружных стен здания. Исследования проводились с использованием вычислительного комплекса TEPL, разработанного для расчета трехмерных температурных полей на основе метода контрольного объема. Приведены результаты анализа распределения температур на поверхностях теплообмена, позволившие определить зоны излишних тепловых потерь в исследуемых конструкциях. Выявлены значительные тепловые потери на откосах оконных проемов, которые следует учитывать при расчете приведенного сопротивления теплопередаче ограждения. Вычислительный комплекс TEPL позволяет не только корректно оценить тепловые потери, но и автоматически получить величину приведенного сопротивления теплопередаче конструкции ограждения с учетом всех особенностей её конструктивного решения.
{"title":"ЧИСЛЕННЫЙ АНАЛИЗ ТЕПЛОВОЙ ЭФФЕКТИВНОСТИ НАРУЖНЫХ СТЕН С ТЕПЛОПРОВОДНЫМИ ВКЛЮЧЕНИЯМИ","authors":"","doi":"10.22337/2587-9618-2023-19-1-155-167","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-155-167","url":null,"abstract":"В практике проектирования и строительства широко применяются численные расчеты с использованием современных вычислительных комплексов, позволяющие эффективно решать задачи по проектированию, возведению и эксплуатации зданий и сооружений различного функционального назначения. Сравнительный анализ численных, теоретических и экспериментальных исследований в области строительных конструкций, зданий и сооружений показывает, что точные методы расчета дают достоверные данные о предмете исследования. В настоящей статье приводятся результаты численных исследований тепловой эффективности неоднородных вертикальных ограждений на примере нескольких вариантов конструктивного решения наружных стен здания. Исследования проводились с использованием вычислительного комплекса TEPL, разработанного для расчета трехмерных температурных полей на основе метода контрольного объема. Приведены результаты анализа распределения температур на поверхностях теплообмена, позволившие определить зоны излишних тепловых потерь в исследуемых конструкциях. Выявлены значительные тепловые потери на откосах оконных проемов, которые следует учитывать при расчете приведенного сопротивления теплопередаче ограждения. Вычислительный комплекс TEPL позволяет не только корректно оценить тепловые потери, но и автоматически получить величину приведенного сопротивления теплопередаче конструкции ограждения с учетом всех особенностей её конструктивного решения.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74213486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-124-134
Irina Negrozova, O. Goryachevsky
This paper presents a numerical solution of the problem of oscillations of a flexible plate placed in a viscous incompressible fluid done with ANSYS. In constructing a finite element model of the plate, both volumetric and shell finite elements, which are more commonly used in engineering applications, are considered. By way of example it is shown that it is possible to transition from a volumetric mesh to a shell mesh without loss of accuracy in solving this problem and similar problems. The considered coupled approach to solving the problem for the shell plate mesh has an important practical application in solving real-world problems of aeroelasticity, because in engineering practice it is much more convenient to represent structures and constructions in the form of beam and shell models. The solution of this problem is of particular importance for the verification of techniques of numerical modelling of coupled aeroelasticity problems.
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Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-147-154
Елена Олеговна Тарасенко
В рамках математического моделирования геологических систем возникают прикладные обратные задачи, требующие решения. В настоящей работе представлены подходы построения решений (приближенных и в явном аналитическом виде) краевых задач, описывающих уплотнение просадочных грунтов методом глубинных взрывов. Проведено численное моделирование дисперсии координат атомов газа, образующегося в просадочном грунте, в результате глубинного взрыва сосредоточенного заряда. Построены приближённые решения поставленной задачи для грунтов с характерными свойствами изотропности и анизотропности для случаев полного поглощения атомов газа окружающим его грунтом и полного отражения от него.
{"title":"ЧИСЛЕННОЕ МОДЕЛИРОВАНИЕ ДИСПЕРСИИ КООРДИНАТ АТОМОВ ГАЗА В МАТЕМАТИЧЕСКОЙ МОДЕЛИ УПЛОТНЕНИЯ ПРОСАДОЧНЫХ ГРУНТОВ ГЛУБИННЫМИ ВЗРЫВАМИ","authors":"Елена Олеговна Тарасенко","doi":"10.22337/2587-9618-2023-19-1-147-154","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-147-154","url":null,"abstract":"В рамках математического моделирования геологических систем возникают прикладные обратные задачи, требующие решения. В настоящей работе представлены подходы построения решений (приближенных и в явном аналитическом виде) краевых задач, описывающих уплотнение просадочных грунтов методом глубинных взрывов. Проведено численное моделирование дисперсии координат атомов газа, образующегося в просадочном грунте, в результате глубинного взрыва сосредоточенного заряда. Построены приближённые решения поставленной задачи для грунтов с характерными свойствами изотропности и анизотропности для случаев полного поглощения атомов газа окружающим его грунтом и полного отражения от него.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87767103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-112-123
Приведено новое техническое решение монтажных стыков металлических конструкций в виде болтовых соединений на косых фланцах, расположенных под углом 30 градусов относительно продольных осей стержневых элементов и снабженных опорными столиками. В таких стыках продольные усилия, приходящиеся на фланцы, раскладываются на нормальные и касательные (тангенциальные) составляющие. Нормальные составляющие передаются на болтовые крепления, а касательные – воспринимаются опорными столиками. При этом в косых фланцах болты нагружены в два раза меньше, чем в прямых. Стыковые соединения обладают необходимым и достаточным запасом несущей способности, обеспечивают уменьшение расхода конструкционного материала и являются равнопрочными со стыкуемыми стержневыми элементами. Предложена практическая методика расчета таких соединений, подтвержденная итогами пробной (контрольной) серии исследований опытных образцов.
{"title":"СТЫКОВЫЕ БОЛТОВЫЕ СОЕДИНЕНИЯ СТЕРЖНЕВЫХ ЭЛЕМЕНТОВ С КОСЫМИ ФЛАНЦАМИ И ИХ РАСЧЕТ","authors":"","doi":"10.22337/2587-9618-2023-19-1-112-123","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-112-123","url":null,"abstract":"Приведено новое техническое решение монтажных стыков металлических конструкций в виде болтовых соединений на косых фланцах, расположенных под углом 30 градусов относительно продольных осей стержневых элементов и снабженных опорными столиками. В таких стыках продольные усилия, приходящиеся на фланцы, раскладываются на нормальные и касательные (тангенциальные) составляющие. Нормальные составляющие передаются на болтовые крепления, а касательные – воспринимаются опорными столиками. При этом в косых фланцах болты нагружены в два раза меньше, чем в прямых. Стыковые соединения обладают необходимым и достаточным запасом несущей способности, обеспечивают уменьшение расхода конструкционного материала и являются равнопрочными со стыкуемыми стержневыми элементами. Предложена практическая методика расчета таких соединений, подтвержденная итогами пробной (контрольной) серии исследований опытных образцов.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84569793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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