Dong-wei Li, M. Könemann, Michael Dölz, S. Münstermann
The characterization of toughness properties in standard Charpy or fracture mechanics tests calls for thickness requirements to be met. Therefore, the characterization of toughness properties is a problem for thin‐walled structures. Replacing Charpy impact toughness testing by impact notch tensile testing can solve this problem. However, the toughness requirements are still expressed in terms of standard test results. Therefore, a framework is proposed here for translating these standard test requirements into impact notch tensile test requirements. The proposed framework relies on numerical simulations with a phenomenological damage mechanics model, which uses state‐of‐stress‐dependent, strain‐based criteria for the prediction of local damage and global fracture. This model takes the effects of non‐proportional strain paths into account and applies different criteria for cleavage and ductile fracture in order to predict correctly the activation of cleavage and ductile fracture mechanisms in the corresponding numerical simulations.
{"title":"A new method for the toughness assessment of mobile crane components based on damage mechanics","authors":"Dong-wei Li, M. Könemann, Michael Dölz, S. Münstermann","doi":"10.1002/stco.202100041","DOIUrl":"https://doi.org/10.1002/stco.202100041","url":null,"abstract":"The characterization of toughness properties in standard Charpy or fracture mechanics tests calls for thickness requirements to be met. Therefore, the characterization of toughness properties is a problem for thin‐walled structures. Replacing Charpy impact toughness testing by impact notch tensile testing can solve this problem. However, the toughness requirements are still expressed in terms of standard test results. Therefore, a framework is proposed here for translating these standard test requirements into impact notch tensile test requirements. The proposed framework relies on numerical simulations with a phenomenological damage mechanics model, which uses state‐of‐stress‐dependent, strain‐based criteria for the prediction of local damage and global fracture. This model takes the effects of non‐proportional strain paths into account and applies different criteria for cleavage and ductile fracture in order to predict correctly the activation of cleavage and ductile fracture mechanisms in the corresponding numerical simulations.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45101515","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}
R. Stroetmann, T. Kästner, Brian Rust, Jan Schmidt
The calculation of the loadbearing capacity of hollow section joints using the design formulas according to EN 1993‐1‐8 assumes full‐strength welded connections if the non‐linear stress distribution over the circumference is not covered by calculation. Sufficient ductility in the connections ensures a plastic redistribution capacity within each joint. In the case of hollow section structures made of high‐strength steels, it becomes more difficult to meet the requirement for full‐strength welds as the yield strength of the base material increases.
{"title":"Welded connections at high‐strength steel hollow section joints","authors":"R. Stroetmann, T. Kästner, Brian Rust, Jan Schmidt","doi":"10.1002/stco.202100036","DOIUrl":"https://doi.org/10.1002/stco.202100036","url":null,"abstract":"The calculation of the loadbearing capacity of hollow section joints using the design formulas according to EN 1993‐1‐8 assumes full‐strength welded connections if the non‐linear stress distribution over the circumference is not covered by calculation. Sufficient ductility in the connections ensures a plastic redistribution capacity within each joint. In the case of hollow section structures made of high‐strength steels, it becomes more difficult to meet the requirement for full‐strength welds as the yield strength of the base material increases.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49329059","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}
{"title":"Content: Steel Construction 2/22","authors":"","doi":"10.1002/stco.202270202","DOIUrl":"https://doi.org/10.1002/stco.202270202","url":null,"abstract":"","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43748563","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}
U. Kuhlmann, A. Dürr, S. Bove, J. Roth, Wigand Knecht
This article deals with the fatigue behaviour of thick‐walled welded K‐joints made up of circular hollow sections (CHS). Two important aspects of the investigations were the extension of the application range to large CHS and the development of practice‐oriented recommendations for fabrication and quality assurance for weld shape and weld quality. For this purpose, fatigue tests were conducted on large CHS joints and on single K‐joints with specified weld irregularities. These studies were accompanied by systematic ultrasonic tests using the phased‐array technique, which were also used for the development of an inspection method for these complex weld geometries. Based on the results achieved by these experimental studies and additional numerical and statistical investigations, a proposal for a German design guideline (DASt‐Richtlinie 029) was finally elaborated to promote the practical implementation of trusses made up of CHS with thick‐walled chords and also to take a first step towards standardization.
{"title":"Fatigue of welded tubular K‐joints made up of circular hollow sections","authors":"U. Kuhlmann, A. Dürr, S. Bove, J. Roth, Wigand Knecht","doi":"10.1002/stco.202100035","DOIUrl":"https://doi.org/10.1002/stco.202100035","url":null,"abstract":"This article deals with the fatigue behaviour of thick‐walled welded K‐joints made up of circular hollow sections (CHS). Two important aspects of the investigations were the extension of the application range to large CHS and the development of practice‐oriented recommendations for fabrication and quality assurance for weld shape and weld quality. For this purpose, fatigue tests were conducted on large CHS joints and on single K‐joints with specified weld irregularities. These studies were accompanied by systematic ultrasonic tests using the phased‐array technique, which were also used for the development of an inspection method for these complex weld geometries. Based on the results achieved by these experimental studies and additional numerical and statistical investigations, a proposal for a German design guideline (DASt‐Richtlinie 029) was finally elaborated to promote the practical implementation of trusses made up of CHS with thick‐walled chords and also to take a first step towards standardization.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48526712","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}
W. Tizani, Manuela Cabrera, Mohammed Mahmood, J. Ninić, Fangying Wang
Extended Hollo‐Bolts (EHBs) are blind bolts that have an extended bolt shank ending in an anchor nut. When used with concrete‐filled tubes, the extension and the anchor in the concrete serve to enhance significantly the performance of both connection components: bolts in tension and tube face in bending. The enhancements are a result of confining the concrete, preventing local buckling of the steel tube and allowing the blind bolt to achieve a tensile strength equal to that of standard bolt+nut fasteners. Overall, the use of the EHB results in a moment‐resisting bolted connection to hollow sections which can achieve rigid behaviour under certain configurations. This paper summarizes research work done to date on such connections at the University of Nottingham. This includes experimental, numerical and analytical modelling. The aim of the work is to provide a fundamental understanding of the behaviour of anchored blind bolt connections to concrete‐filled columns, leading to the specification of appropriate design rules that allow the use of such bolted moment‐resisting connections in practice. The work has proposed analytical models for: connection stiffness, column face‐bending strength considering both single and group behaviour of bolt rows, anchored bolts in tension and anchored bolts under combined tension and shear.
{"title":"The behaviour of anchored extended blind bolts in concrete‐filled tubes","authors":"W. Tizani, Manuela Cabrera, Mohammed Mahmood, J. Ninić, Fangying Wang","doi":"10.1002/stco.202100037","DOIUrl":"https://doi.org/10.1002/stco.202100037","url":null,"abstract":"Extended Hollo‐Bolts (EHBs) are blind bolts that have an extended bolt shank ending in an anchor nut. When used with concrete‐filled tubes, the extension and the anchor in the concrete serve to enhance significantly the performance of both connection components: bolts in tension and tube face in bending. The enhancements are a result of confining the concrete, preventing local buckling of the steel tube and allowing the blind bolt to achieve a tensile strength equal to that of standard bolt+nut fasteners. Overall, the use of the EHB results in a moment‐resisting bolted connection to hollow sections which can achieve rigid behaviour under certain configurations. This paper summarizes research work done to date on such connections at the University of Nottingham. This includes experimental, numerical and analytical modelling. The aim of the work is to provide a fundamental understanding of the behaviour of anchored blind bolt connections to concrete‐filled columns, leading to the specification of appropriate design rules that allow the use of such bolted moment‐resisting connections in practice. The work has proposed analytical models for: connection stiffness, column face‐bending strength considering both single and group behaviour of bolt rows, anchored bolts in tension and anchored bolts under combined tension and shear.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49243371","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}
Sandwich panels are able to support their sub-structure against failure due to loss of stability. Especially for thin-walled Z-profiles used in lightweight metal construction as purlins, customary span-lengths often only can be reached by taking into account stabilization effects, which can be described as a combination of diaphragm and torsional restraint. However, for the load combination of dead weight and wind suction, the diaphragm is usually located on the flange under tensile stress, which means that only marginally stabilization effects can be added to the system. In addition, acc. to the German NA to DIN EN 1993-1-3, no stabilization due to a torsional restraint may be used for the aforementioned load combination. Recent investigations showed on the one hand that the reduction of the torsional restraint under uplifting loads stated in the literature is true, but on the other hand the investigations also provides a quantification of this reduction others than the rough engineering assumptions of 100 % to 50 % reduction often used in the past. Thus, a qualified estimation of the applicable torsional restraint under uplifting loads is possible, based on component tests and FE-calculations and derived from a mechanical model. The paper describes the scientific background as well as the mechanical model. Krieglstein, T.; Lener, G.; Naujoks, B.; Kühn, B. (2022) Stabilisierung von ZKantprofilen unter abhebenden Lasten. Stahlbau 91, H. 3, S. 162–171. https://doi.org/10.1002/stab.202100100 Stabilization of thin-walled profiles under uplift loads E D I T O R ’ S R E C O M M E N D A T I O N S
夹芯板能够支撑其子结构，防止因失去稳定性而导致的破坏。特别是在轻质金属结构中用作檩条的薄壁z型型材，通常只能通过考虑稳定效应才能达到通常的跨度长度，这可以被描述为隔膜和扭转约束的组合。然而，对于自重和风吸力的载荷组合，膜片通常位于法兰上，承受拉应力，这意味着只能给系统增加边际稳定效果。此外，acc。根据德国NA到DIN EN 1993-1-3，由于扭转约束而没有稳定可以用于上述负载组合。最近的研究表明，一方面，文献中所述的在上升载荷下扭转约束的减少是正确的，但另一方面，研究也提供了这种减少的量化，而不是过去经常使用的100%到50%的粗略工程假设减少。因此，基于部件试验和有限元计算，并从力学模型中推导，对上升载荷下适用的扭转约束进行合格估计是可能的。本文介绍了研究的科学背景和力学模型。Krieglstein t;琳恩,g;Naujoks b;[khn, B.](2022)基于abhebenden的ZKantprofilen稳定性分析。]施特博91,H. 3, S. 162-171。https://doi.org/10.1002/stab.202100100抬升荷载作用下薄壁型材的稳定化研究[j]，李建军，李建军，李建军，等
{"title":"Stabilization of thin‐walled profiles under uplift loads","authors":"","doi":"10.1002/stco.202270204","DOIUrl":"https://doi.org/10.1002/stco.202270204","url":null,"abstract":"Sandwich panels are able to support their sub-structure against failure due to loss of stability. Especially for thin-walled Z-profiles used in lightweight metal construction as purlins, customary span-lengths often only can be reached by taking into account stabilization effects, which can be described as a combination of diaphragm and torsional restraint. However, for the load combination of dead weight and wind suction, the diaphragm is usually located on the flange under tensile stress, which means that only marginally stabilization effects can be added to the system. In addition, acc. to the German NA to DIN EN 1993-1-3, no stabilization due to a torsional restraint may be used for the aforementioned load combination. Recent investigations showed on the one hand that the reduction of the torsional restraint under uplifting loads stated in the literature is true, but on the other hand the investigations also provides a quantification of this reduction others than the rough engineering assumptions of 100 % to 50 % reduction often used in the past. Thus, a qualified estimation of the applicable torsional restraint under uplifting loads is possible, based on component tests and FE-calculations and derived from a mechanical model. The paper describes the scientific background as well as the mechanical model. Krieglstein, T.; Lener, G.; Naujoks, B.; Kühn, B. (2022) Stabilisierung von ZKantprofilen unter abhebenden Lasten. Stahlbau 91, H. 3, S. 162–171. https://doi.org/10.1002/stab.202100100 Stabilization of thin-walled profiles under uplift loads E D I T O R ’ S R E C O M M E N D A T I O N S","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45152574","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}
{"title":"Passion for Hollow Sections","authors":"","doi":"10.1002/stco.202280003","DOIUrl":"https://doi.org/10.1002/stco.202280003","url":null,"abstract":"","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49383634","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}
Circular hollow sections (CHS) offer a variety of constructional and architectural advantages. Up to now, hollow section structures have usually been connected by welding, and more rarely by bolting. However, these established connection methods have disadvantages. Despite its great success in the mobility sector, adhesive bonding is not yet used for joining hollow steel sections in steel construction. Adhesive bonding, however, has significant advantages, especially if combined with classical joining processes. To highlight these advantages, this article presents excerpts from the results obtained in two recently completed research projects. First, a hybrid brace connection for hollow section framework structures is presented which combines welding, bolting and adhesive bonding methods. In addition, the loadbearing behaviour of a novel hybrid grouted connection, which advantageously combines adhesive and grout materials, is analysed and discussed in this paper.
{"title":"Hybrid connection technologies for hollow sections in steel construction","authors":"T. Ummenhofer, Jakob Boretzki, M. Albiez","doi":"10.1002/stco.202100048","DOIUrl":"https://doi.org/10.1002/stco.202100048","url":null,"abstract":"Circular hollow sections (CHS) offer a variety of constructional and architectural advantages. Up to now, hollow section structures have usually been connected by welding, and more rarely by bolting. However, these established connection methods have disadvantages. Despite its great success in the mobility sector, adhesive bonding is not yet used for joining hollow steel sections in steel construction. Adhesive bonding, however, has significant advantages, especially if combined with classical joining processes. To highlight these advantages, this article presents excerpts from the results obtained in two recently completed research projects. First, a hybrid brace connection for hollow section framework structures is presented which combines welding, bolting and adhesive bonding methods. In addition, the loadbearing behaviour of a novel hybrid grouted connection, which advantageously combines adhesive and grout materials, is analysed and discussed in this paper.","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45853232","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}
Annarosa Lettieri, Elena Elettore, Ludovica Pieroni, F. Freddi, M. Latour, G. Rizzano
Nominated for Eurosteel 2021 Best Paper Award
获得2021年欧洲钢铁公司最佳论文奖提名
{"title":"Parametric analysis of steel MRFs with self‐centring column bases","authors":"Annarosa Lettieri, Elena Elettore, Ludovica Pieroni, F. Freddi, M. Latour, G. Rizzano","doi":"10.1002/stco.202100050","DOIUrl":"https://doi.org/10.1002/stco.202100050","url":null,"abstract":"Nominated for Eurosteel 2021 Best Paper Award","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48932263","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}
Thilo Feucht, B. Waldschmitt, J. Lange, Maren Erven
Nominated for Eurosteel 2021 Best Paper Award
获得2021年欧洲钢铁公司最佳论文奖提名
{"title":"Additive manufacturing of a bridge in situ","authors":"Thilo Feucht, B. Waldschmitt, J. Lange, Maren Erven","doi":"10.1002/stco.202100045","DOIUrl":"https://doi.org/10.1002/stco.202100045","url":null,"abstract":"Nominated for Eurosteel 2021 Best Paper Award","PeriodicalId":54183,"journal":{"name":"Steel Construction-Design and Research","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46801574","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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