Pub Date : 2022-02-28DOI: 10.37538/0039-2383.2022.1.4.13
M. Farfel, M. Gukova, A. E. Svyatoshenko
The paper presents the derivation of formulas for the method of calculating bent elements for general stability, given in SP 16.13330, which is based on the theory of thin-walled elastic rods and the system of differential equations of V. Z. Vlasov. Formulas are given for a single-span beam with a hinged mounting of supports. A general equation has been compiled for calculating the bending stability coefficient φ_1, which allows adapting the requirements of SP16.13330 standards to various types of load action in the beam span. The results are presented for twenty-five different types of external load action. The formulas take into account the arbitrary location of the load along the height of the beam section, from the lower edge of the lower belt to the upper edge of the upper belt. The values of the critical moment M_cr, at which a new form of equilibrium state arises in the beam, are determined, according to the conclusions of the work [6]. The critical moment M_cr is calculated in the form of a stability problem of the first kind – the loss of a stable position of an element of a rectilinear shape (the load acts along the line of the bending center, the neutral axis of the beam is rectilinear, the material is elastic). The formulas of the presented table can be used to perform verification calculations.
本文根据薄壁弹性杆理论和V. Z. Vlasov的微分方程组，推导了sp16.13330中给出的一般稳定弯曲单元的计算公式。给出了铰接支承单跨梁的计算公式。编制了计算弯曲稳定系数φ_1的一般公式，使其能够适应SP16.13330标准对梁跨中各种荷载作用的要求。给出了25种不同类型的外荷载作用的结果。这些公式考虑了荷载沿梁段高度的任意位置，从下带的下边缘到上带的上边缘。根据工作[6]的结论，确定了临界矩M_cr的值，在此时刻，梁中出现了一种新的平衡态形式。临界矩M_cr以第一类稳定性问题的形式计算——直线形状的单元的稳定位置的损失(荷载沿弯曲中心的直线作用，梁的中性轴是直线的，材料是弹性的)。给出的表格中的公式可用于进行验证计算。
{"title":"Total stability of two constant section beams. Development of payment provisions","authors":"M. Farfel, M. Gukova, A. E. Svyatoshenko","doi":"10.37538/0039-2383.2022.1.4.13","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.1.4.13","url":null,"abstract":"The paper presents the derivation of formulas for the method of calculating bent elements for general stability, given in SP 16.13330, which is based on the theory of thin-walled elastic rods and the system of differential equations of V. Z. Vlasov. Formulas are given for a single-span beam with a hinged mounting of supports. A general equation has been compiled for calculating the bending stability coefficient φ_1, which allows adapting the requirements of SP16.13330 standards to various types of load action in the beam span. The results are presented for twenty-five different types of external load action. The formulas take into account the arbitrary location of the load along the height of the beam section, from the lower edge of the lower belt to the upper edge of the upper belt. The values of the critical moment M_cr, at which a new form of equilibrium state arises in the beam, are determined, according to the conclusions of the work [6]. The critical moment M_cr is calculated in the form of a stability problem of the first kind – the loss of a stable position of an element of a rectilinear shape (the load acts along the line of the bending center, the neutral axis of the beam is rectilinear, the material is elastic). The formulas of the presented table can be used to perform verification calculations.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128892846","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 : 2022-02-28DOI: 10.37538/0039-2383.2022.1.59.65
V. V. Mishchenko
The main tasks of suspension of a heavy flexible thread are formulated in an “exact” formulation: without the use of “simplifications” characterizing the existing methods of calculating overhead wires and cables. A general solution is given to determine the actual position and gravity of the flexible thread modeling the overhead line wire, based on the results of full-scale geometric measurements. The possibility of solving “exact” problems using existing software is shown.
{"title":"APPLIED PROBLEMS OF SUSPENSION OF HEAVY FLEXIBLE THREAD IN GENERAL","authors":"V. V. Mishchenko","doi":"10.37538/0039-2383.2022.1.59.65","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.1.59.65","url":null,"abstract":"The main tasks of suspension of a heavy flexible thread are formulated in an “exact” formulation: without the use of “simplifications” characterizing the existing methods of calculating overhead wires and cables. A general solution is given to determine the actual position and gravity of the flexible thread modeling the overhead line wire, based on the results of full-scale geometric measurements. The possibility of solving “exact” problems using existing software is shown.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114659507","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 : 2020-04-15DOI: 10.37538/0039-2383.2020.2.28.32
E. Koreneva, V. Grosman
{"title":"Analytical computation of combined constructions","authors":"E. Koreneva, V. Grosman","doi":"10.37538/0039-2383.2020.2.28.32","DOIUrl":"https://doi.org/10.37538/0039-2383.2020.2.28.32","url":null,"abstract":"","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132982243","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.2.7
A. P. Loktionov
Mathematical modeling and experimental study of the inverse Cauchy problem of restoring the initial parameters of the elastic line of a beam element of a building structure for given minor coefficients of the beam deflection equation are considered. With a uniform continuous absolute norm of error for measuring deflections by interpolating with a Lagrange polynomial, the distribution of deflection meters over the beam is obtained, which minimizes the error in restoring the initial parameters by the criterion of minimum of the Lebesgue function.
{"title":"RECOVERY OF THE INITIAL PARAMETERS OF THE BEAM WITH THE GIVEN JUNIOR COEFFICIENTS OF THE DEFLECTION EQUATION","authors":"A. P. Loktionov","doi":"10.37538/0039-2383.2022.6.2.7","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.2.7","url":null,"abstract":"Mathematical modeling and experimental study of the inverse Cauchy problem of restoring the initial parameters of the elastic line of a beam element of a building structure for given minor coefficients of the beam deflection equation are considered. With a uniform continuous absolute norm of error for measuring deflections by interpolating with a Lagrange polynomial, the distribution of deflection meters over the beam is obtained, which minimizes the error in restoring the initial parameters by the criterion of minimum of the Lebesgue function.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124585582","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.48.54
S. Osykov, A. Trofimov
Steel-concrete composite structures under bending moments have different deformation characteristics, which leads to interfacial slip and affects the stress-strain state of the entire structure as a whole. This paper presents an analytical expression for determining the friction capacity parameter in steel-concrete composite beam structures under various boundary conditions. The interfacial shear stress and interfacial shear force plot of such structures is shown. The contribution of the interfacial effect to the overall rigidity of the composite structure is estimated. The analytical values of the deflections are compared with the values obtained experimentally. The results of comparison show that neglecting the interfacial effect in current standards and guidelines leads to incorrect assessment of structural deformability. The proposed analytical model can be used to determine the stiffness of steel-concrete composite slabs.
{"title":"INFLUENCE OF INTERFACIAL INTERACTION TO THE STIFFNESS OF STEEL-CONCRETE COMPOSITES WITH VARIOUS BOUNDARY CONDITIONS UNDER BENDING MOMENTS","authors":"S. Osykov, A. Trofimov","doi":"10.37538/0039-2383.2022.6.48.54","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.48.54","url":null,"abstract":"Steel-concrete composite structures under bending moments have different deformation characteristics, which leads to interfacial slip and affects the stress-strain state of the entire structure as a whole. This paper presents an analytical expression for determining the friction capacity parameter in steel-concrete composite beam structures under various boundary conditions. The interfacial shear stress and interfacial shear force plot of such structures is shown. The contribution of the interfacial effect to the overall rigidity of the composite structure is estimated. The analytical values of the deflections are compared with the values obtained experimentally. The results of comparison show that neglecting the interfacial effect in current standards and guidelines leads to incorrect assessment of structural deformability. The proposed analytical model can be used to determine the stiffness of steel-concrete composite slabs.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117164120","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.40.47
O. Sabirova, G. V. Sorokina, А.М. Uzdin, M. Fedorova
The ways of combining loads in evaluating strains and other indicators of the structure operation are considered. The main attention is paid to two methods: constructing the distribution density function of the analyzed factor caused by the simultaneous action of loads and the analysis of equiprobable pairs of the considered loads. It is shown that these methods are described by different equations and lead to different results. The first way is more conservative. The ambiguity of the task of determining the load design combination is noted. The conclusions are illustrated by a simple example.
{"title":"METHODS FOR COMBINING LOADS IN THE DESIGN OF THE SEISMIC STABILITY STRUCTURES","authors":"O. Sabirova, G. V. Sorokina, А.М. Uzdin, M. Fedorova","doi":"10.37538/0039-2383.2022.6.40.47","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.40.47","url":null,"abstract":"The ways of combining loads in evaluating strains and other indicators of the structure operation are considered. The main attention is paid to two methods: constructing the distribution density function of the analyzed factor caused by the simultaneous action of loads and the analysis of equiprobable pairs of the considered loads. It is shown that these methods are described by different equations and lead to different results. The first way is more conservative. The ambiguity of the task of determining the load design combination is noted. The conclusions are illustrated by a simple example.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123501517","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.69.74
V.V. Katyushin
For individual structures and structural systems that have pronounced non-linear properties or properties that are not described or regulated by the current calculation standards, for example, for thin-walled structures; for systems with large deformations; for calculations for progressive collapse, etc., it is proposed to supplement the method of limit states, which describes structural systems in stationary states, to supplement or, in some cases, replace it with restrictions on its limiting (normalized) behavior of its elements and nodes in time and determined by the limit allowable gradients of system responses from changing external influences.
{"title":"CONCEPTS OF THE CALCULATION METHOD FOR STRUCTURES ACCORDING TO THE LIMIT (NORMALIZED) BEHAVIOR","authors":"V.V. Katyushin","doi":"10.37538/0039-2383.2022.6.69.74","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.69.74","url":null,"abstract":"For individual structures and structural systems that have pronounced non-linear properties or properties that are not described or regulated by the current calculation standards, for example, for thin-walled structures; for systems with large deformations; for calculations for progressive collapse, etc., it is proposed to supplement the method of limit states, which describes structural systems in stationary states, to supplement or, in some cases, replace it with restrictions on its limiting (normalized) behavior of its elements and nodes in time and determined by the limit allowable gradients of system responses from changing external influences.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125492360","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.55.60
A.E. Khudaynatov, A. V. Logvinov, A. Y. Ivanova, E. A. Pavlova
A comparative analysis of the design cross-sections of ceramic bricks and large-format ceramic masonry according to the EN 1996-1-1 buckling (concentrated load) calculation algorithm and Russian standards is carried out. The main differences in calculations are pointed out. Recommendations are given for refining the methodology of concentrated load calculation for masonry made of large-format ceramic block.
{"title":"SPECIFICS OF CALCULAR MASONRY LAGE-FORMAT ORGANIC BLOCK STRUCTURES CRUSHING (CONCENTRATED LOAD) ACCORDING TO RUSSIAN AND EUROPEAN STANDARTS","authors":"A.E. Khudaynatov, A. V. Logvinov, A. Y. Ivanova, E. A. Pavlova","doi":"10.37538/0039-2383.2022.6.55.60","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.55.60","url":null,"abstract":"A comparative analysis of the design cross-sections of ceramic bricks and large-format ceramic masonry according to the EN 1996-1-1 buckling (concentrated load) calculation algorithm and Russian standards is carried out. The main differences in calculations are pointed out. Recommendations are given for refining the methodology of concentrated load calculation for masonry made of large-format ceramic block.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114649489","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.61.68
S. Turkovskiy, A. Pogoreltsev, V. Stoyanov
Serial production of glued wooden structures (GWS) in Russia was organized in 1975. The structural system “TSNIISK” was created and improved since 1975. The feature of the system is the use of prefabricated GWS joints on glued rods in nodes and joints. They were applied in hundreds of large-span buildings: water parks, playpens, fertilizer terminals, sports facilities, which were designed in the Loadbearing wood structures of laboratory of TSNIISK named after V. A. Koucherenko. According to Federal Law FL No. 384 of 12/30/2009, the structures of these buildings are subject to field surveys and monitoring. The article presents systematized conclusions about the state of GWS based on the results of their examination. Characteristic defects of the GWS are delaminations along the adhesive seams and cracks along the wood. The main causes of delamination are operating conditions with low relative humidity, violations of bonding technology and design errors. The analysis of the state of the GWS allowed to form recommendations for safe operation and suggestions to the design standards.
在俄罗斯，胶合木结构(GWS)的批量生产始于1975年。“TSNIISK”结构系统是自1975年以来创建和改进的。该系统的特点是在节点和节点的粘接棒上使用预制GWS接头。它们被应用于数百个大跨度建筑:水上公园，游乐场，肥料终端，体育设施，这些都是在以V. A. Koucherenko命名的TSNIISK实验室的承重木结构中设计的。根据2009年12月30日第384号联邦法，这些建筑物的结构必须接受实地调查和监测。本文根据他们的检查结果，对GWS的状态提出了系统的结论。GWS的特征缺陷是沿粘接接缝的分层和沿木材的裂纹。造成分层的主要原因是相对湿度较低的操作条件、违反粘合技术和设计错误。通过对GWS状态的分析，提出了安全运行建议和设计标准建议。
{"title":"EXPERIENCE IN THE OPERATION OF LARGE-SPAN LAMINATED TIMBER STRUCTURES WITH TSNIISK SYSTEM NODES","authors":"S. Turkovskiy, A. Pogoreltsev, V. Stoyanov","doi":"10.37538/0039-2383.2022.6.61.68","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.61.68","url":null,"abstract":"Serial production of glued wooden structures (GWS) in Russia was organized in 1975. The structural system “TSNIISK” was created and improved since 1975. The feature of the system is the use of prefabricated GWS joints on glued rods in nodes and joints. They were applied in hundreds of large-span buildings: water parks, playpens, fertilizer terminals, sports facilities, which were designed in the Loadbearing wood structures of laboratory of TSNIISK named after V. A. Koucherenko. According to Federal Law FL No. 384 of 12/30/2009, the structures of these buildings are subject to field surveys and monitoring. The article presents systematized conclusions about the state of GWS based on the results of their examination. Characteristic defects of the GWS are delaminations along the adhesive seams and cracks along the wood. The main causes of delamination are operating conditions with low relative humidity, violations of bonding technology and design errors. The analysis of the state of the GWS allowed to form recommendations for safe operation and suggestions to the design standards.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127396026","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 : 1900-01-01DOI: 10.37538/0039-2383.2022.6.28.39
I. Ivanchenko
Boundary elements for rods on an elastic base are proposed for the calculation of bridges on the HSR when moving at a variable speed of an inertial load (railway train). A set of linear and trigonometric functions is used to approximate the displacements at the construction of boundary elements. These elements are used to calculate the vibrations of the rail track outside the bridge and the track on the bridge, together with double-track girder superstructures connected through the interlayers at high-speed movement of arbitrary power and inertial loads. To construct the methodology, the step method proposed earlier by the author of the article for solving problems of unsteady dynamics of structures and the method of calculating structures for the action of mobile force and inertial loads (the method of nodal accelerations) are used.
{"title":"THE CALCULATING METHOD FOR INTERACTION OF A BRIDGE CROSSING AND A HIGHSPEED TRAIN AT VARIABLE SPEED (ELABORATING STANDARDS FOR HIGH-SPEED RAILWAYS","authors":"I. Ivanchenko","doi":"10.37538/0039-2383.2022.6.28.39","DOIUrl":"https://doi.org/10.37538/0039-2383.2022.6.28.39","url":null,"abstract":"Boundary elements for rods on an elastic base are proposed for the calculation of bridges on the HSR when moving at a variable speed of an inertial load (railway train). A set of linear and trigonometric functions is used to approximate the displacements at the construction of boundary elements. These elements are used to calculate the vibrations of the rail track outside the bridge and the track on the bridge, together with double-track girder superstructures connected through the interlayers at high-speed movement of arbitrary power and inertial loads. To construct the methodology, the step method proposed earlier by the author of the article for solving problems of unsteady dynamics of structures and the method of calculating structures for the action of mobile force and inertial loads (the method of nodal accelerations) are used.","PeriodicalId":273885,"journal":{"name":"STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126364322","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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