Steel Construction-Design and Research最新文献_第5页

Patch loading resistance of slender plate girders with multiple longitudinal stiffeners 多纵加劲细长板梁的局部荷载抗力

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-02-01 DOI: 10.1002/stco.202200047

B. Kövesdi, L. Dunai

{"title":"Patch loading resistance of slender plate girders with multiple longitudinal stiffeners","authors":"B. Kövesdi, L. Dunai","doi":"10.1002/stco.202200047","DOIUrl":"https://doi.org/10.1002/stco.202200047","url":null,"abstract":"There is currently no reliable and simple design method available in international literature for the determination of the patch loading resistance of slender plate girders having multiple longitudinal stiffeners. The current research focuses on the patch loading resistance of girders having multiple longitudinal stiffeners. An advanced numerical model is developed and verified by own laboratory test results. A numerical parametric study is executed to investigate the load‐carrying capacity of girders having typical bridge geometries. Analysing the numerical simulation results, the structural behaviour obtained is classified based on the stiffener stiffness. Effect of the different geometrical parameters on the patch loading resistance is evaluated with special focus on the stiffener stiffness and distance between the longitudinal stiffeners. The failure modes depending on stiffener stiffness are investigated and the local buckling type failure is characterised by minimum stiffness. For this specific failure mode, an improved design method is developed, giving reliable resistance within the analysed parameter range. The presented resistance model is consistent with the design philosophy of EN 1993‐1‐5. The applicability of the improved design equation has been investigated for multiple stiffener places in unequal distances, which is the common case in praxis, and for bending and transverse force (M–F) interaction.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41432339","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}

引用次数: 0

Failure mechanisms of TWCFS members considering various eccentricities 考虑各种偏心度的TWCFS构件的失效机制

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-02-01 DOI: 10.1002/stco.202200045

V. Ungureanu, M. Kotełko, Florin Bodea, I. Both, L. Czechowski

{"title":"Failure mechanisms of TWCFS members considering various eccentricities","authors":"V. Ungureanu, M. Kotełko, Florin Bodea, I. Both, L. Czechowski","doi":"10.1002/stco.202200045","DOIUrl":"https://doi.org/10.1002/stco.202200045","url":null,"abstract":"Thin‐walled cold‐formed steel elements represent an attractive structural solution due to the fast manufacturing and erection time on‐site. Their small thickness leads to imperfection and sensitivities to eccentricities. An experimental programme was performed on short members with lipped channel cross section, subjected to eccentric compression about the minor and major axes, in a large range of eccentricities. The specimens were manufactured on a folding machine. Before testing, the dimensions of all specimens were measured. Shortening of all specimens was measured in two ways, i.e., 1) using the displacement gauge integrated with the machine crosshead beam and 2) from deformation fields obtained using digital image correlation (DIC) system. The quantitative results, presented as the ultimate loads versus the eccentricity curve, emphasise the influence of the eccentric load on the capacity of the element. Finite element (FE) analyses were performed to simulate the behaviour of short members in eccentric compression using the commercial FE software ABAQUS/CAE and ANSYS. Static non‐linear analyses were conducted in displacement control. Both geometrical and material nonlinearities were included. An isotropic linearly elastic‐perfectly plastic constitutive model was considered, with von Mises yielding the criterion and associated flow rule. Failure modes were identified due to numerical and experimental tests. Plastic mechanism models were derived, resulting in the derivation of post‐ultimate, rigid‐plastic curves, characterising a post‐ultimate structural behaviour.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46947028","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}

引用次数: 0

Decision tree for local + global imperfection combinations in double‐symmetric prismatic members – Practical recommendations in the framework of advanced analysis 双对称棱柱成员局部+全局不完美组合的决策树——高级分析框架中的实用建议

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-01-30 DOI: 10.1002/stco.202200041

Andreas Müller, M. Vild, A. Taras

{"title":"Decision tree for local + global imperfection combinations in double‐symmetric prismatic members – Practical recommendations in the framework of advanced analysis","authors":"Andreas Müller, M. Vild, A. Taras","doi":"10.1002/stco.202200041","DOIUrl":"https://doi.org/10.1002/stco.202200041","url":null,"abstract":"Better and simpler possibilities of structural optimization due to increasing computational power but also for reasons of environmental sustainability, the use of materials and their reusability lead to greater acceptance towards more advanced numerically intensive, so‐called ‘design by analysis' methods like geometrically and materially non‐linear analyses with imperfections (GMNIA). The general choice of imperfections and their combination in such models, especially for slender cross sections of intermediate length prone to an interaction between a global and local plate buckling, is crucial in terms of the reached load‐bearing capacity. Annex C of EN 1993‐1‐5:2010 makes use of the ‘70 %‐rule' for the combination of imperfection modes and amplitudes. This rule postulates that two GMNIA calculations should be conducted when local and global interactive buckling may be dominant; one with 100 % + 70 % of the maximum specified amplitude in either case. In addition, extended information is provided on the choice and combination of imperfections in the newly introduced and currently available draft of the prEN 1993‐1‐14:2020 (design assisted by finite element analysis). Although information is provided on how the local and global imperfections should be combined, it is not stated when it is relevant to consider those. Based on conducted GMNIA simulations on SHS/RHS (square and rectangular hollow sections) and I‐shaped sections, this article presents general decision support on the choice of equivalent imperfections. On the basis of numerical analysis, the developed flow chart and design routine allow for the decision whether the consideration of the interaction of local and global imperfections is required or not.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41791923","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}

引用次数: 2

A numerical perspective for CFRP‐wrapped thin‐walled steel cylinders CFRP包裹薄壁钢筒的数值透视

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-01-26 DOI: 10.1002/stco.202200014

A. Aydın, M. Maali, Mahmut Kılıç, Barış Bayrak, Oğuzhan Akarsu

{"title":"A numerical perspective for CFRP‐wrapped thin‐walled steel cylinders","authors":"A. Aydın, M. Maali, Mahmut Kılıç, Barış Bayrak, Oğuzhan Akarsu","doi":"10.1002/stco.202200014","DOIUrl":"https://doi.org/10.1002/stco.202200014","url":null,"abstract":"The failure of steel cylindrical shells with carbon fiber‐reinforced polymers (CFRP) under hydrostatic pressure is studied in this article by experimental tests and the finite element method. Simulations were performed for 12 cylindrical shells with different dent numbers, dent depths, and two perfect models with and without CFRP. The finite element models are built to simulate the buckling behavior. The nonlinear stabilization method is preferred to simulate the buckling behavior. The finite element results agree well with the corresponding experimental tests and theories. A parametric study is conducted, and the number, depth, width of dents, and the effects of CFRPs on the critical buckling pressure are discussed. The dents are placed symmetrically around the cylinder with a thickness of tc (thickness of cylinder) and 2tc mm. The initial and overall buckling load decreased with increasing amplitude for dent numbers with different dent depths on all models. The results show that the number and depth of dents generally have a negative effect on the buckling strength, while CFRPs increase the critical buckling strength and are effective in repair as a retrofitting concept.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43497857","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}

引用次数: 1

Ultimate and fatigue limit states of existing steel railway bridges – LRFD with historical steel products and connection types 既有钢质铁路桥梁的极限和疲劳极限状态——具有历史钢材和连接类型的LRFD

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-01-20 DOI: 10.1002/stco.202200042

R. Kroyer, A. Taras

{"title":"Ultimate and fatigue limit states of existing steel railway bridges – \u0000LRFD with historical steel products and connection types","authors":"R. Kroyer, A. Taras","doi":"10.1002/stco.202200042","DOIUrl":"https://doi.org/10.1002/stco.202200042","url":null,"abstract":"The assessment of the load‐bearing capacity and fatigue strength of existing railway bridges has been playing an increasingly important role in the infrastructure management of railway operators for several years now. Currently, many bridge structures have been in operation longer than it was foreseen during their planning and construction. In addition, the axle loads on many lines, as well as the demands on the reliability of the verification results, have steadily increased. As the material properties and construction techniques in existing structures differ to some extent from nowadays structures, e.g., riveting instead of welding, it is important to provide engineers and operators with recommendations for the assessment of existing steel bridges. This article summarises the studies conducted as part of a research project initiated by Deutsche Bahn Netz AG for possible updates to DB RiL 805, which is used for the verification of railway bridges in the Deutsche Bahn (DB) network. The studies concerned the transition of verification concepts against static and fatigue loads used in the past to limit state verifications with partial safety factors in accordance with the Eurocodes. While initially related to an upgrade of a specific operator's design recommendation, the findings in this article are of more general nature and could form the basis for similar developments of recommendations for the assessment of existing, riveted structures independently throughout Europe.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44503143","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}

引用次数: 2

Gap height prediction for bolted ring flange connections based on measurements 基于测量的螺栓环法兰连接间隙高度预测

IF 1.6

Steel Construction-Design and Research Pub Date : 2023-01-11 DOI: 10.1002/stco.202200019

Aljoscha Buchholz, M. Seidel

{"title":"Gap height prediction for bolted ring flange connections based on measurements","authors":"Aljoscha Buchholz, M. Seidel","doi":"10.1002/stco.202200019","DOIUrl":"https://doi.org/10.1002/stco.202200019","url":null,"abstract":"Wind turbine towers and their flange connections are highly fatigue loaded structures. Previous investigations have shown that initial parallel gaps between L‐flange connections, which are resulting from their respective flatness of the contact surfaces, can increase fatigue loads of the connecting fasteners significantly. Flange flatness and/or gap sizes in between flanges must comply with limitations given in relevant standards and therefore must be measured after the manufacturing process and/or during installation. More than 1900 flatness measurements of several offshore wind projects were collected and used to determine initial gaps between flanges analytically. A statistical evaluation allows to determine the distribution of expected gap sizes. The increase of gap height with increasing gap length can be described with linear correlations. Furthermore, the distributions of gap heights are approximated with log‐normal distributions. Parameters for generic log‐normal distributions are derived considering all performed mating simulations. Following the described methodology, gaps can be determined from any large number of flatness measurements. It is proposed to consider the results for flange design.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45751295","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}

引用次数: 2

Effective design concepts for welded mixed connections in steel structures 钢结构焊接混合连接的有效设计理念

IF 1.6

Steel Construction-Design and Research Pub Date : 2022-11-01 DOI: 10.1002/stco.202270404

{"title":"Effective design concepts for welded mixed connections in steel structures","authors":"","doi":"10.1002/stco.202270404","DOIUrl":"https://doi.org/10.1002/stco.202270404","url":null,"abstract":"Mixed connections made of normal strength and high strength steels enable optimal material use to the forces acting on them. This leads to ecological and economic advantages through reduced material consumption and smaller weld geometries. Normative rules for buttwelded mixed connections of normal strength and high strength steels do not exist, therefore a design approach for such connections is to be developed in the research project “Effective design concepts for mixed connections in steel structures”. In addition, the design concepts already developed for butt-welds and fillet-welds are being extended up to S960, in order to integrate the results into the new version of EN 1993-1-12. For this purpose, extensive experimental investigations of the load-carrying capacity are carried out by varying the base material, welding consumable, heat input, plate thickness and weld geometry. With the results obtained and further accompanying investigations, the influences of the varying parameters on the load-carrying capacity of the welded connections will be identified. von Arnim, M.; Eichler, S.; Brätz, O.; Hildebrand, J.; Gericke, A.; Kuhlmann, U.; Bergmann, J. P.; Flügge, W. (2022) Effiziente Nachweiskonzepte für geschweißte Mischverbindungen im Stahlbau. Stahlbau 91, No. 10, pp. 660–670. https://doi.org/10.1002/stab.202200046 Effective design concepts for welded mixed connections in steel structures E D I T O R ’ S R E C O M M E N D A T I O N","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42579439","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}

引用次数: 0

Equivalent geometric imperfections for the LTB‐design of members with I‐sections I型截面构件LTB设计的等效几何缺陷

IF 1.6

Steel Construction-Design and Research Pub Date : 2022-11-01 DOI: 10.1002/stco.202200025

R. Stroetmann, Sergei Fominow

{"title":"Equivalent geometric imperfections for the LTB‐design of members with I‐sections","authors":"R. Stroetmann, Sergei Fominow","doi":"10.1002/stco.202200025","DOIUrl":"https://doi.org/10.1002/stco.202200025","url":null,"abstract":"For the stability assessment of members and structures according to EN 1993‐1‐1, the equivalent member method, the geometrical non‐linear calculation with equivalent geometrical imperfections or the GMNIA analysis with geometrical imperfections and residual stresses can be used alternatively. The second possibility requires a corresponding model for the cross‐section resistance. For the verification of lateral torsional buckling, bow imperfections e0 out‐of‐plane are defined, which lead in combination with the given loading in‐plane and the geometrical non‐linear analysis to bending moments Mz and torsion of the members. The amplitudes of the imperfections are highly dependent on the nature of the approach (e.g., scaling of the buckling shape, assumption of bow imperfections) and the verification method for the members. Within the framework of the scientific work supervised by the TU Dresden and TU Darmstadt, extensive parametric studies were conducted to calibrate imperfections for lateral torsional buckling based on the GMNIA. After determining the nature of imperfections and the design models for section resistance, this article presents results of these parametric studies and shows the calibration of imperfections for a standardisation proposal based on EN1993‐1‐1. The evaluation of the data in combination with the necessary simplifications for the design practice leads to appropriate definitions of imperfection values e0,LT and the necessary differentiations.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41273300","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}

引用次数: 0

Practice‐oriented design of tubular bracings in steel and composite bridges 钢和组合桥梁中管状支撑的实用设计

IF 1.6

Steel Construction-Design and Research Pub Date : 2022-11-01 DOI: 10.1002/stco.202270405

引用次数: 0

News: Steel Construction 4/2022 新闻：钢结构4/2022

IF 1.6

Steel Construction-Design and Research Pub Date : 2022-11-01 DOI: 10.1002/stco.202270406

引用次数: 0