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IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures最新文献

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Structural stress analyses of long-span railway extradosed cable- stayed bridge based on reasonable construction state 基于合理施工状态的铁路大跨斜拉桥结构应力分析
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0141
Weiqiang Guo, B. Briseghella, Junqing Xue, Quan Chen, C. Nuti
{"title":"Structural stress analyses of long-span railway extradosed cable- stayed bridge based on reasonable construction state","authors":"Weiqiang Guo, B. Briseghella, Junqing Xue, Quan Chen, C. Nuti","doi":"10.2749/prague.2022.0141","DOIUrl":"https://doi.org/10.2749/prague.2022.0141","url":null,"abstract":"The system of the extradosed cable-stayed bridge constantly changed during construction. In order to obtain the reasonable finished dead state and ensure the structural safety during construction, it is necessary to deeply investigate the construction stages. A finite element model of a real long- span railway extradosed cable-stayed bridge built in China was established by using MIDAS/Civil finite element software to analyze the stress and deformation of the bridge based on reasonable construction state. The results show that it should be paid attention to the longitudinal displacement at the top of the tower after the middle-span closure stage, and the vertical displacement of the girder in the longest single cantilever stage. The maximum compressive stresses of the tower appeared after the cable tensioning and the girder appeared when the bridge is in the longest single cantilever state are less than the design compressive strength of concrete C55. The maximum tensile stress of the girder appeared when the bridge is in the longest double cantilever state is less than the design tensile strength of concrete C55.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"6 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":"115390008","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
Creating digital twins of existing bridges through AI-based methods 通过基于人工智能的方法创建现有桥梁的数字双胞胎
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0727
M. S. Mafipour, S. Vilgertshofer, A. Borrmann
{"title":"Creating digital twins of existing bridges through AI-based methods","authors":"M. S. Mafipour, S. Vilgertshofer, A. Borrmann","doi":"10.2749/prague.2022.0727","DOIUrl":"https://doi.org/10.2749/prague.2022.0727","url":null,"abstract":"Bridges require regular inspection and maintenance during their service life, which is costly and time-consuming. Digital twins (DT), which incorporate a geometric-semantic model of an existing bridge, can support the operation and maintenance process. The process of creating such DT models can be based on Point cloud data (PCD), created via photogrammetry or laser scanning. However, the semantic segmentation of PCD and parametric modeling is a challenging process, which is nonetheless necessary to support DT modeling. This paper aims to propose a segmentation method that is the basis for a parametric modeling approach to enable the semi-automatic geometric modeling of bridges from PCD. To this end, metaheuristic algorithms, fuzzy C-mean clustering, and signal processing algorithms are used. The results of this paper show that the scan to BIM process of bridges can be automated to a large extent and provide a model that meets the industry’s demand.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"94 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":"115435165","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
Pedestrian bridge over the River Elbe in Hradec Králové 赫拉德克易北河上的人行天桥Králové
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1047
Jiří Keclík, Viktor Stržínek, L. Navarová, L. Vráblík, P. Harazim, Libor Kábrt, M. Elich, Gabriela Elichová, Daniela Lombardini
{"title":"Pedestrian bridge over the River Elbe in Hradec Králové","authors":"Jiří Keclík, Viktor Stržínek, L. Navarová, L. Vráblík, P. Harazim, Libor Kábrt, M. Elich, Gabriela Elichová, Daniela Lombardini","doi":"10.2749/prague.2022.1047","DOIUrl":"https://doi.org/10.2749/prague.2022.1047","url":null,"abstract":"The new bridge over the Elbe River will be a rather unusual structure made of modern materials. The design solution is truly a challenge for the architects, designers and the contractor and requires their close cooperation. In its final statical scheme, the structure forms a virtual Vierendeel truss of variable height. The designing of the structure involves the necessity to cope with many complex details, which are often beyond the limits of applicable design standards and regulations. The contractor will use uncommon technologies for construction of the structure. These methods will facilitate the installation process while carrying an ecological aspect.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","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":"117119409","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
Load Sharing System Performance Considering Structural Members Contribution in Plate Girder Bridges with Corrosion Damages 考虑腐蚀损伤板梁桥构件贡献的荷载分担系统性能
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1747
Ryoga Oura, Takashi Yamaguchi, Kentaro Arimura
{"title":"Load Sharing System Performance Considering Structural Members Contribution in Plate Girder Bridges with Corrosion Damages","authors":"Ryoga Oura, Takashi Yamaguchi, Kentaro Arimura","doi":"10.2749/prague.2022.1747","DOIUrl":"https://doi.org/10.2749/prague.2022.1747","url":null,"abstract":"Bridges are composed by many structural members, such as girders, deck slabs, cross-frames, etc., which interact each other to resist various load combinations. In the traditional bridge design method, the structural member is usually analyzed as an independent part/member without considering the structural system behavior.In present study, a whole-scale FE analysis has been conducted for a steel I-girder bridge system with corrosion damages, considering the behavior of the bridge as a system by removing its structural members one by one. It is found from the analytical results that the deck slab and cross- frames are effective for load sharing when corrosion occurs at the girder end of the outer girder subjected to vertical load. As the damage increases, reduction of the maximum load when the deck slab is removed is larger than that of the cross-frames removal. We have also confirmed that the deck slab and cross-frames work as alternative load sharing paths to each other.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"14 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":"123801225","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
Torsional buckling strengthening in cruciform columns 十字形柱抗扭屈曲加固
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1873
Peter Paul Hoogendoorn, Ignacio Fernando Ares Gestal, José Antonio Franco López
{"title":"Torsional buckling strengthening in cruciform columns","authors":"Peter Paul Hoogendoorn, Ignacio Fernando Ares Gestal, José Antonio Franco López","doi":"10.2749/prague.2022.1873","DOIUrl":"https://doi.org/10.2749/prague.2022.1873","url":null,"abstract":"Flanged cruciform steel columns are often used in heavy-duty industrial buildings, with high axial loads and buckling length, to effectively eliminate weak-axis flexural buckling. Consequently, torsional buckling often becomes the governing failure mode under compression. While the effectiveness of twisting and warping restraints has been extensively studied for lateral torsional buckling, much less research is available on torsional buckling restraints in cruciform members.For this study various FEM-assisted linear elastic buckling analyses have been performed to assess the increase in torsional buckling resistance due to typical end connections as compared to ideal fork end conditions. Furthermore, it is shown that adding intermediate warping restraints is an effective means against torsional buckling. Finally, a simple design criterion is presented for their spacing and dimensions to effectively eliminate torsional buckling.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"218 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":"122393459","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
A state-of-the-art, flexible, easy-to-replace plug-type expansion joint for the Delaware Memorial Bridge 特拉华纪念大桥的最先进的，灵活的，易于更换的plug-type伸缩缝
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0250
Forest Kovach, G. Moor, Dominik Ortmann
{"title":"A state-of-the-art, flexible, easy-to-replace plug-type expansion joint for the Delaware Memorial Bridge","authors":"Forest Kovach, G. Moor, Dominik Ortmann","doi":"10.2749/prague.2022.0250","DOIUrl":"https://doi.org/10.2749/prague.2022.0250","url":null,"abstract":"The modern flexible plug expansion joint, which uses a special polyurethane material rather than the asphaltic material traditionally used, has been developed to offer an optimal small-movement expansion joint solution, in many cases, to bridge construction and maintenance engineers. Its long- term performance is vastly superior to that of the asphaltic plug joint – thanks, for example, to its great strength and elasticity (with the material allowing 650% elongation before failure), its resistance to both very low and very high temperatures, and the special advantages it offers when used to replace old joints in existing structures with minimum impact on traffic. The expansion joint is described, in terms of properties, benefits and installation, with reference to an ongoing project to replace the expansion joints of the Delaware Memorial Bridge.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"419 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":"122860543","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
Refurbishing, Strengthening and Retrofitting Façades to Increase Seismic Resistance 翻新、加固和改造外墙以增加抗震能力
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0829
M. Roik, Samuel Hine
{"title":"Refurbishing, Strengthening and Retrofitting Façades to Increase Seismic Resistance","authors":"M. Roik, Samuel Hine","doi":"10.2749/prague.2022.0829","DOIUrl":"https://doi.org/10.2749/prague.2022.0829","url":null,"abstract":"Recent events have shown that existing, older buildings often lack sufficient seismic resistance. Façade collapse is particularly concerning as falling components can cause personal injury and block escape and emergency access routes. The 2020 earthquakes in Croatia highlighted these issues and caused considerable damage to thousands of buildings, a high proportion of which were either old or poorly preserved and located in Zagreb’s historic centre. Due to the cultural importance of historic buildings, when restoring or improving the static load-bearing capacity, suitable and aesthetically sympathetic repair methods should be used. This paper presents methods for the repair of existing façades which can be used to preserve the historic building fabric and strengthen the façade structure with the aim of meeting seismic design requirements. An alternative to large shake table tests is described, the technical background is explained and test results are presented.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"80 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":"114152001","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
Advancement of Eddy Current Based Evaluation of Axial Force of High-Strength Bolts 基于涡流法的高强度螺栓轴向力评估研究进展
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1148
Ayako Akutsu, E. Sasaki, Masayuki Tai, T. Shimozato
{"title":"Advancement of Eddy Current Based Evaluation of Axial Force of High-Strength Bolts","authors":"Ayako Akutsu, E. Sasaki, Masayuki Tai, T. Shimozato","doi":"10.2749/prague.2022.1148","DOIUrl":"https://doi.org/10.2749/prague.2022.1148","url":null,"abstract":"High-strength bolted joints are widely used in steel bridges. However, bolt axial force may decrease during the service life of a bridge for many reasons including relaxation, traffic load, and earthquake. Consequently, the remaining bolt axial force is considered a factor with uncertainty that is important to evaluate. In a previous study, the authors proposed an axial force evaluation method using eddy current. In this study, to apply the proposed axial force evaluation method to the actual measurements, new evaluation indices with the possibility of reducing measurement errors and simplifying measurement have been considered. The applicability of the improved method for high- strength bolts using weathering steel has also been examined. An experiment using both high- strength bolts and weathering steel high-strength bolts was conducted to investigate the possibility of evaluating the stress change due to the axial force with the new indices.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"21 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":"123621543","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
The New Storstrøm Bridge - Nonlinear Dynamic Ship Impacts 新型Storstrøm桥-船舶非线性动力碰撞
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1435
Martin N. Svendsen, P. Bertolini, Frederik Vind
{"title":"The New Storstrøm Bridge - Nonlinear Dynamic Ship Impacts","authors":"Martin N. Svendsen, P. Bertolini, Frederik Vind","doi":"10.2749/prague.2022.1435","DOIUrl":"https://doi.org/10.2749/prague.2022.1435","url":null,"abstract":"The New Storstrøm Bridge in Denmark is a 3800m long concrete girder bridge with 44 standard spans of mostly 80m and two navigational spans of 160m which are stay cable supported. The foundations are constructed as direct pad foundations, i.e. with the ability of the caissons to slide and rotate on gravel beds. The bridge supports two high-speed railway tracks and two lanes of road traffic. The waters of Storstrømmen are prone to high naval activity and this, in combination with relatively flexible foundations and high dynamic sensitivity of the girder due to train runability requirements, implies that ship impact scenarios are a critical design parameter. In the present paper, nonlinear dynamic ship impacts performed for the detail design are presented. The simulations include nonlinear representation of soil stiffnesses as well as ship indentation properties. Also, nonlinear geometric effects and strongly nonlinear bearing uplift effects are considered. Detailed descriptions of the complex structural response mechanisms occurring during critical ship impacts are provided and the influence of girder/pier tie-down cables on uplift magnitudes are presented.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"9 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":"121286484","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: 3
Structural Characteristics and Analysis Simulation of New Core Truss Structure 新型核心桁架结构特性及分析仿真
IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0258
Shunichi Nakagawa, M. Aoki, Nariyoshi Matsuzaki, F. Seki, Yudai Hasegawa
{"title":"Structural Characteristics and Analysis Simulation of New Core Truss Structure","authors":"Shunichi Nakagawa, M. Aoki, Nariyoshi Matsuzaki, F. Seki, Yudai Hasegawa","doi":"10.2749/prague.2022.0258","DOIUrl":"https://doi.org/10.2749/prague.2022.0258","url":null,"abstract":"The possibilities of the truss structure are extended and a new core truss structure (Square Core Truss structure, hereinafter referred to as SCT structure) is proposed. The SCT structure consists of four pairs of diagonal members connected by two panel points, and the structure is stabilized by using deformation restraint member in the space between the panel points. This causes contact problems between the diagonal members and the deformation restraint members, complicating the simulation of the boundary conditions. In this paper, a wooden pedestrian bridge with a span of 8m was designed and fabricated by structural analysis (3D framework analysis). Static loading experiment was conducted on the specimen to confirm the mechanical properties due to contact. The experimental results and the results of contact analysis simulation, reproducing the contact condition using the nonlinear finite element method, are reported.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"76 2 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":"116257032","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
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